TW201145263A - Method and apparatus for decoding an audio signal - Google Patents

Abstract

An apparatus for decoding an audio signal and method thereof are disclosed. The present invention includes receiving the audio signal and spatial information, identifying a type of modified spatial information, generating the modified spatial information using the spatial information, and decoding the audio signal using the modified spatial information, wherein the type of the modified spatial information includes at least one of partial spatial information, combined spatial information and expanded spatial information. Accordingly, an audio signal can be decoded into a configuration different from a configuration decided by an encoding apparatus. Even if the number of speakers is smaller or greater than that of multi-channels before execution of downmixing, it is able to generate output channels having the number equal to that of the speakers from a downmix audio signal.

Description

201145263 VI. Description of the Invention: [Technical Field] The present invention relates to audio signal processing, and more particularly to an audio signal decoding apparatus and method thereof. Although the present invention is suitable for a wide range of applications, it is particularly suitable for decoding audio signals. [Prior Art] Generally, when an encoder encodes an audio signal, if the audio signal to be encoded is a multi-channel audio signal, the multi-channel audio signal is downmixed into two channels or one channel to generate a downmix audio signal, and Capture spatial information from multi-channel audio signals. Spatial information is information that can be used to upmix multichannel audio signals from downmix signals. At the same time, the encoder downmixes the multichannel audio signal according to a predetermined tree configuration. This example towel 'predetermined tree configuration can be used for audio signal decoding and audio signal coding. The structure is determined. If the teacher information indicates the type of the predetermined tree configuration, the decoding (4) can know that it has been upgraded. Mixed audio signal structures, such as the number of channels, the location of each channel, and so on. Therefore, if the encoder downmixes the multi-channel signal according to the predetermined tree configuration, the spatial information captured by this process is also determined by this structure. Therefore, if the decoder uses this, the m-information of the core of the nucleus is mixed with the downmix lag, then the multi-channel audio signal according to this structure is generated. That is, if the decoder uses the encoder The spatial information generated, the upmixing process is completed according to the agreed structure between the encoder and the decoding. Therefore, the output channel audio signal that does not follow the structure cannot be generated. For example, the upmix signal 201145263 cannot be as determined according to the agreed structure. SUMMARY OF THE INVENTION One or more problems are caused by the above problems, the decoding apparatus and the method thereof. The main object of the present invention is to provide an audio signal that substantially eliminates the limitations and disadvantages of the prior art. The purpose is to provide a decoding device and method for the audio signal, and to solve the structure of the squad, so that the structure is different from the structure of the mosquito. The other purpose of the MV is to provide an audio signal decoding device and method thereof. The new spatial information can be generated by correcting the previous spatial information generated during the encoding to decode the audio sensitive number. Other features and advantages will be set forth in the following book towel, and can be understood from the following aspects of the present invention or can be paid from the practice of the present invention. The object and other advantages of the present invention can be bribed. The present specification and general description of the present invention will now be realized and obtained in the light of the description and the appended claims. The audio signal method of the present invention comprises receiving a uniform frequency signal and spatial information (spatial informati〇n), identifying a type of corrected spatial information, using spatial information to generate a modified spatial (four) message, and making secret official spatial information. Decoding audio 峨, the tamper-modified m-message includes at least one of partial spatial information, combined spatial information, and extended spatial information. 201145263 In order to further obtain these and other advantages of the present invention, an audio of the present invention The signal decoding method includes receiving spatial information, using the spatial information to generate combined spatial information, and using the group The Lang Wei decoding audio signal generates combined spatial information by combining spatial parameters included in the spatial information. To further obtain the objectives and other advantages of the present invention, an audio signal decoding method of the present invention includes receiving spatial information and space. Filter information, wherein the spatial information includes at least a spatial parameter, and the spatial waver information includes at least one waver parameter; the transparent and combined negative wave n parameter generates a combined space Wei containing a surrounding effect; and the combined Lang sounding pro The number is a virtual surround signal. In order to further obtain the above objects and other advantages of the present invention, an audio signal decoding method of the present invention includes a Weiyin face number; receiving spatial information including tree configuration information and spatial parameters; Adding space and space information to generate a revised space; and making the secret space information upmixed with audio signals, including the conversion of the age-based frequency signal to the age-based frequency signal, and the primary information based on the extended space information The upmix audio is converted to a second upmix audio signal. It is to be understood that the summary of the invention as described above and the details of the invention as described hereinafter are all examples of the generation of filaments and the properties of the invention, and are intended to further disclose the scope of the invention. [Embodiment] Hereinafter, preferred embodiments of the present invention will be described in detail in conjunction with the drawings. 6 S: 201145263 The terminology used in the present invention is a selection of commonly used terms that are currently used globally. Also, the applicant arbitrarily selects terms for a specific example, and the preferred embodiment of the preferred embodiment of the present invention will explain the detailed meaning. Therefore, the invention should be understood in accordance with the meaning of the terms and not by the names of the terms. First, the present invention uses spatial information to generate modified spatial information, and then uses the generated modified spatial information to decode the audio signal. In this example, the spatial information is the spatial information acquired during the downmixing process according to the predetermined tree configuration, and the modified space is the spatial information newly generated by the information system for using the spatial information. The present invention will be explained in detail below with reference to "Fig. 1". Fig. 1 is a block diagram of an audio signal encoding apparatus and an audio signal decoding apparatus according to an embodiment of the present invention. Please refer to "Figure 1". The audio signal encoding device 1〇〇 includes a downmixing unit 11〇 and a spatial information unit 12〇. The audio signal decoding device 2 (8) includes an output channel generating unit 210 and a modified space information generating unit 22A. The downmixing unit U of the encoding device 100 generates a downmix audio domain d by downmixing the multichannel audio signal. The downmix audio simple d can be the signal generated by the downmix unit m downmixing the multi-channel frequency signal IN_M, or the arbitrary downmix audio signal generated by the multi-channel audio signal IN. The encoding device is dependent on the unit 12Q from the multi-channel audio signal IN-M. In this example, the spatial information is the information needed to mix the audio signal 4 liters into the multi-channel audio signal IN_M. At the same time, the spatial information can be the information that the predetermined tree configuration in the process of downmixing the multi-channel audio 201145263 signal IN. In this example, the tree configuration can correspond to the audio signal decoding and the agreed tree configuration between the encoding devices, but the invention is not limited thereto. Spatial information can include tree configuration information, indicator elements, and spatial parameters. The tree configuration information is information of the tree configuration type. Therefore, several multi-channels and each channel downmix sequence are changed according to the tree configuration type. The indicator element is used to indicate whether or not the extended space information appears. In addition, the spatial parameters may include channel levd difference (CLD), channel-to-channel correlation or homology (inter-channelc〇ITelati〇n〇r coherence; ICC) during downmixing of at least two channels into at most two channels. And channel prediction coefficients (channd predicti〇n coefficients; CPC) and so on. At the same time, the space-bein operation unit 120 is more capable of operating extended space information as well as spatial information. In this example, the extended empty message system is information that needs to be additionally extended with the downmix audio signal d having the upmixed spatial parameters. The extended space information can include extended channel configuration information as well as extended space parameters. The extended space information 'will be explained later is not limited to the extended space information captured by the spatial information capturing unit 120. In addition, the encoding apparatus 100 further includes a coding unit (not shown) of the core codec (c) for generating a downmix audio bit 7C stream by decoding the downmix audio signal d; (4) an information coding unit ( The towel is not shown) for generating a spatial information bit stream through the encoded spatial information S; and a multi-material (not shown in the circle) for generating the multiplexed downmix audio bit stream and the spatial information bit stream Audio_bit stream, the invention is not limited thereto. The decoding device 200 may further include a demultiplexing unit (not shown) for separating the audio signal bit stream into a downmix audio bit stream and a spatial information bit stream; a decoding unit of the core codec (Fig. The data is not used to decode the downmix audio bit stream; and the spatial information decoding unit (not shown) is used to decode the spatial information bit stream, and the present invention is not limited thereto. The modified spatial information generating unit 22 of the decoding device 200 uses the spatial information to identify the type of the corrected spatial information, and then generates a certain type of modified miscellaneous information s based on the identified spatial information. For this example towel, this spatial information can be the spatial information s just converted from the coded device. The revised spatial information is the new information generated by using this spatial information. In addition, there are multi-faceted modified spatial information. The type of the modified spatial information includes at least the following: a) partial information, b) ridge information, and c) extended space information, and the present invention is not limited thereto. Part of the spatial information contains part (4) of the number of beaches;

Generated by combining spatial parameters; extended space_messages are generated by information between spatial information. The T-corrected spatial information generating unit 220 is configured to generate the modified spatial information, and the manner of generating the modified spatial information can be etched according to the formalization #__(4). Explain how to generate various types of revised lang information. The tree shape == The reference for determining the modified spatial information may correspond to the spatial information status information and the indicator element may be included in the Weilin, and the heart-splitting group U in the coding device (four) St. Output Channel 201145263 - The speaker is used for a speaker interconnected with the decoding device 200, which may include a number of output channels and location information for each of the ifcit channels. The information of the sampan can be input in advance by the operator = or input by the user. The method of determining the type of corrected spatial information by such information will be explained in detail below. The output channel generating unit 21 of the decoding device 200 uses the modified spatial information s to generate an output channel audio signal 〇υτ N of the downmix audio signal d. The spatial chopper information 230 is information of the sound path and is supplied to the corrected spatial information generating unit 220. If the modified spatial information generating unit 22 generates a combined empty service containing surround sound, the space information can be used. In the following, the interpretation of the audio signal decoding method in accordance with the type of the modified spatial information is explained as follows: (1) partial spatial information, (2) combined spatial information, and (3) expanded spatial information. (1) Partial spatial information is calculated because the two parameters are calculated according to the predetermined tree shape _ in the downmixing process of the audio channel of the home channel. Therefore, if the complete m parameter is used to decode the downmix audio signal, it will be rebuilt. _ Start more than the audio city. If you try to make the output channel number (four) M less than the multi-channel number of channels Μ ', you will be able to decode the downmix audio signal by the spatial parameters of the division. This method can vary depending on the downmixing order of the multichannel audio signals in the encoding device and the I method, for example, the type of tree configuration. In addition, you can use the space-based tree configuration information crane tree configuration ugly type ^ This method can be changed according to the number of output channels 201145263. In addition, it is also possible to use the output channel information to query the round-out channel. In the following, the number of channels of the audio channel of the output channel is smaller than the number of channels of the frequency signal, and an audio decoding method using space information including partial spatial parameters may be used. This method will be explained below in conjunction with a plurality of tree configurations. (1)-1 The first example of the tree configuration (5_2_5 tree configuration) "2" is a schematic diagram of an embodiment of applying partial space information. Please refer to the left part of "Figure 2" for the relationship between the multi-channel audio signal downmixed into the stereo downmixing channels Lo and R〇 and the relationship between the spatial channel and the spatial parameters of the channel, where the multi-channel audio signal The number of channels is 6 (left front channel L, left surround channel Ls, central channel C, low frequency channel LFE, right front channel R, and right surround channel Rs). First, the downmix between the left front channel L and the left surround channel Ls, the downmix between the center channel C and the low frequency channel LFE, and the downmix between the right front channel r and the right surround channel Rs are completed. In this primary downmixing process, the left total channel Lt, the central total channel Ct, and the right total channel Rt are generated. In addition, the spatial parameters calculated during this primary downmixing process include CLD2 (including ICC2), CLD1 (including ICC1), and CLD0 (including ICC0). During the secondary downmixing process of the primary downmixing process, the left total channel Lt, the central total channel Ct, and the right total channel Rt are downmixed to produce a left channel Lo and a right channel Ro. The spatial parameters calculated during the second downmixing process may include CLDTTT, 201145263 CPCTTT, and ICCTTT. In other words, the multi-channel audio signal having six channels can be downmixed in the above-described order to produce the left and right channels L〇 and R〇 of the stereo downmix. If the spatial parameters (CLD2, CLD1, CLD0, and CLDTTT, etc.) calculated using the above-described order mode are mixed up in the reverse order of the downmixing order, a multi-channel audio signal is generated, in which the number of channels is 6 (left front channel L, left surround) Channel ls, central channel C, low frequency channel LFE, right front channel R and right surround channel Rs). Please refer to the right part of "2nd picture". If part of the spatial information corresponds to the CLDTTT in the spatial parameters (CLD2, CLD, CLD0, CLDTTT, etc.), the upmix is the left total channel Lt, the central total channel Ct, and the right total channel. Rt. If the left total channel Lt and the right total channel Rt are selected as the output channel audio signal ', the output channel audio signals of the two channels Lt and Rt can be generated. If the left total channel Lt, the central total channel Ct, and the right total channel Rt are selected as the output channel audio signals, the output channel audio signals of the two channels Lt, Ct, and Rt can be generated. After the upmixing is completed using the additional spatial parameter CLD1, if the left total channel Lt, the right total channel, the central channel C, and the low frequency channel LFE are selected, the output channel audio of the four channels (Lt, Rt, C, and LFE) can be generated. Signal. (1)-2 Second example of tree configuration (5 small 5 tree configuration) "3rd picture" is a schematic diagram of another example of applying partial space information.凊 Refer to the left part of “Figure 3” for the sequence of down-mixing multi-channel audio signals into a single downmix audio signal and the relationship between multi-channel audio signals and spatial parameters. The number of channels is 6 (left front channel L, left 12 201145263 surround channel Ls, central channel C, low frequency channel LFE, right front channel R, and right surround channel Rs). First, similar to the first example, the downmix between the left front channel L and the left surround channel Ls, the downmix between the center channel C and the low frequency channel LFE, and the downmix between the right front channel R and the right surround channel Rs are completed. In the primary downmixing process, the left total channel Lt, the central total channel Ct, and the right total channel Rt are generated. The spatial parameters calculated during the primary downmix process include CLD3 (including ICC3), CLD4 (including ICC4), and CLD5 (including ICC5) (in this example, CLDx and ICCx are different from CLDx in the previous first example). During the secondary downmixing process of the primary downmixing process, the left total channel Lt and the right total channel Rt are downmixed to produce the left central channel lc; the central total channel ct and the right total channel Rt are downmixed to produce the right center Channel ^^. The spatial parameters calculated during the second downmixing process may include CLD2 (including ICC2) and CLD1 (including ICC1). Next, during the three downmixing processes, the left central channel 1/: and the right central channel RC are downmixed to produce a single downmix audio signal M. The spatial parameters calculated during the three downmixing process include CLD0 (including ICC0) and so on. Please refer to the right part of "3rd picture". If part of the spatial information corresponds to CLD0 in the spatial parameters (CLD3, CLD4, CLD5, CLD1, CLD2, CLD0, etc.), the left central channel LC and the right central channel are generated. If the left central channel LC and the right central channel Rc are selected as the output channel audio signals, the output channel audio signals of the two channels LC and RC can be generated. Meanwhile, if part of the spatial information corresponds to CLDO, CLD1, and CLD2 in the spatial parameters (CLD3, CLD4, 13 201145263 CLD5, CLD, CLD2, and CLD0, etc.), the left total channel Lt, the central total channel Ct, and the right total channel Rt are generated. . If the left total channel Lt and the right total channel Rt are selected as the output channel audio signals, then Xiao can generate the output channel audio signals of the two channels Lt and Rt. If the left total channel Lt, the central total channel Ct, and the right total channel Rt are selected as the output channel audio signals, the output channel audio signals of the three channels Lt, Ct, and Rt can be generated. If part of the spatial information still includes the spatial parameter CLD4, after the central channel c and the low frequency channel LFE are upmixed, if the left total channel Lt, the right total channel see, the central channel C, and the low frequency channel LFE are selected as the output channel audio signals, it can be generated. Output channel audio signal for four channels (left total channel Lt, right total channel Rt, central channel c, and low frequency channel LFE). (1)-3 The third example of the tree configuration (54-5 tree configuration) Fig. 4 is a schematic diagram of another example of applying partial space information. «Monthly reference to the left part of Figure 4, which shows the sequence of downmixing multi-channel audio signals into a single downmix audio signal M and the relationship between multi-channel audio signals and spatial parameters, among which multi-channel audio signals The number of channels is 6 (left front channel L, left surround channel Ls, central channel c, low frequency channel LFE, right front channel R, right surround channel Rs). Similar to the first or second example, first, the downmix between the left channel L· and the left surround channel U, the downmix between the center channel C and the low frequency channel LFE, and the right channel R and the right surround channel rs are completed. Downmix. In the primary downmixing process, the left total channel Lt, the central total channel Ct, and the right total channel Rt are generated. The 201145263 spatial parameters calculated during the primary downmixing process include CLD1 (including ICl), CLD2 (including ICC2), and CLD3 (including ICC3), etc. (In this example, CLDx and ICCx are different from those in the previous first or second example. CLDx and ICCx). In the second downmixing process following the primary downmixing process, the left total channel Lt, the central total channel Ct, and the right total channel Rt are downmixed together to produce a left central channel LC and a right channel R. And the spatial parameter CLDTTT (including ICCTTT) is calculated.

In the sequential 'three downmixing process, the left central channel LC and the right channel R are downmixed to produce a single downmix audio signal. And calculate the spatial parameter CLD0 (including ICC0). Please refer to the right part of "Fig. 4". If part of the spatial information corresponds to CLD0 and CLDTTT in the spatial parameters (CLD, CLD2, CLD3, CLDTTT, CLD0, etc.), the left total channel Lt, the central total channel ct, and the right will be generated. Total channel Rt〇 If the left total channel Lt and the right total channel Rt are selected as the output channel audio signals, the output channel audio signals of the two channels Lt and Rt can be generated. If the left total channel Lt, the central total channel Ct, and the right total channel Rt are selected as the output channel audio signals', the output channel audio signals of the three channels Lt, Ct, and Rt can be generated. If part of the spatial information still includes the spatial parameter CLD2, after the center channel C and the low frequency channel LFE are upmixed, if the left total channel Lt, the right total channel Rt, the central channel C, and the low frequency channel LFE are selected as the round-out channel audio signals, The round-out channel audio signal is generated for four channels (left total channel Lt, right total channel, central channel 匚, and low-frequency pass 15 201145263 LFE). In the above description, it is explained that the spatial parameters of the application section generate an output channel audio signal _程' but rely on the three-sided _ as (4). In addition, as part of the spatial information, it is also possible to apply the combined spatial information or the extended space resource so that the process of applying the modified spatial information to the audio signal can be layered or combined and synthesized. Control it. (2) Combined spatial information, because the two information systems are calculated in the downmixing process of multi-channel audio signals according to the predetermined tree configuration. Therefore, if the spatial parameters of the spatial information are compressed by __ method, the downmixing is decoded. Frequency reduction, shot reconstruction of the initial multi-channel audio signal before downmixing. If the number of channels of the multi-channel audio signal is different from the number of C channels of the audio signal of the output channel, a new space information is generated by combining the spatial information, and then the downmix audio signal can be upmixed using the generated information. In particular, applying spatial parameters to the conversion public can generate combined spatial parameters. This method can be varied in accordance with the downmixing order and method of the multi-channel audio signal of the encoding device. Moreover, (4) the tree-shaped configuration information of the spatial information query, the descending order of the person and the square, can vary according to the number of round-out channels. In addition, it is enough to use the output channel information to query the number of output channels, and the like. In the following description, a detailed embodiment of a method of correcting spatial information and an embodiment of obtaining a virtual 3-D effect will be explained. (2)-1 General Combination Space Information The present invention provides a method for generating two parameters of the combined 201145263 by combining the spatial parameters of the space f signal for performing a tree configuration different from the downmix process. Upmixing process. Therefore, regardless of the tree configuration, the tree configuration information can be applied to various downmix audio signals. If the multi-channel audio signal is 5.1 channels and the downmix audio signal is 丨 channel (single channel), the following two examples are used to explain the output signal of the output channels of the two channels. (2) Fourth embodiment of the -M tree configuration (5+51 tree configuration) "5th picture" is a schematic diagram of an example of applying combined spatial information. The left side of the "5th figure", CLD0 to CLD4 and ICC0 to ICC4 (not shown) can be called spatial parameters, which are calculated in the downmixing process of the 5.1 channel multi-channel audio signal. For example, in the spatial parameter, the channel-to-channel difference between the left channel signal L and the right channel signal R is CLD3, and the channel-to-channel correlation between L and R is ICC3. The channel difference between the left surround channel Ls and the right surround channel Rs is CLD2, and the channel-to-channel correlation between Ls and RS is ICC2. On the other hand, please refer to the right part of "5th picture". If the combined spatial parameters CLDa and ICOx are applied to the single downmix audio signal m, the left channel signal Lt and the right channel signal Rt are generated, and the audio can be from a single channel. The stereo output channel audio signals Lt and Rt are directly generated in the signal m. In this example, the combined spatial parameters CLDa and ICCa can be calculated by combining the spatial parameters CLD0 to CLD4 and ICC0 to ICC4. In the following, the process of calculating the CLDa in the combined spatial parameters by combining the spatial parameters CLD0 to CLD4 is first explained, and then the process of calculating the ICCa in the combined spatial parameters by combining the spatial parameters 5 17 201145263 CLD0 to CLD4 and ICC0 to ICC4 is explained. . (2) Derivation of the -lla spatial parameter CLDa First, since the spatial parameter CLDa is the difference between the left output signal Lt and the right output signal Rt, the definition of the input left output signal Lt and the right output signal Rt to the spatial parameter CLD The result of the formula is as follows: [Formula 1] CLDa = 10*logl0(PLt/PRt) where PLt is the power of the left output signal Lt and PRt is the power of the right output signal Rt. [Formula 2] CLDa = 10 * logl0 (PLt + a / PRt + a) where PLt is the power of the left output signal Lt, PRt is the power of the right output signal Rt, and 'a' is a very small constant. Therefore, the spatial parameter CLD α is defined by Equation 1 or Equation 2. At the same time, in order to use the spatial parameters CLD0 to CLD4 to represent PLt and PRt, it is necessary to output the left output 峨Lt of the channel audio 1 右, the right output signal Rt of the touch channel audio signal and the multi-channel signals L, Ls, R, Rs, c and The relationship formula between the two. The corresponding relationship can be defined as follows: [Formula 3]

Lt = L + Ls + C / V2 + LFE / ^ 2 ^ = R + Rs + C / V2 + LFE / V2 201145263 The relationship can be defined according to how to define the material channel audio because it is similar to formula 3

The number changes, so it can also be defined in the formula of Equation 3. For example, (10) or LFE/W may be '〇' or '1'. S Equation 3 can be derived as Equation 4 below: [Formula 4] PLt = PL + PLs + PC/2 + PLFE/2 PRt = PR + PRs + PC/2 + PLFE/2 According to Equation 1 or Equation 2, PLt can be used. And pRt represents the spatial parameter CLDα. PLt and PRt can be expressed in accordance with Equation 4' using PL, PLs, PC, PLFE, PR, and PRS. Therefore, you need to find a relationship that can use the spatial parameters CLD0 to CLD4 to represent PL, PLs, PC, PLFE, PR, and PRs. At the same time, if the tree configuration is as shown in Figure 5, the relationship between the multi-channel audio signals (l, R, C, LFE, Ls, and RS) and the signal of the single downmix channel is as follows: 5] 'L ' ciomci〇mcu〇TT〇R dr c2,omc\,orr\c\y〇Tro C Dc •ft — Cl,OTT4 C2 ,〇m C\ ,〇7TO LFE DlFE ffl a C2,O7T4C2, OTT\Ch〇TT0 Ls C\, OTT2C2.O7T0 Rs . C2, OTT2C2, OTTQ _ where, ) 11+101° , vi+io 10 Equation 5 can be derived as Equation 6: 19 201145263 where

CXCSTx 1 1 + 10 10 'Pl ' (Cl,0773^1,0771^1,OTTO ) Pr (C2t07T3Cl(07TlCl,07T〇) Pc (C\tOTT4C2tOTT\CU〇7TO ) Plfe (C2,O7T4C2,O7TlCl,O7T0 ) Pu (C1,07T2C2,07T〇) (C2,07T2C2,〇7T〇) — 'σττ> In particular, by inputting Equation 6 to Equation 4, and entering Equation 4 to Equation j or Equation 2, it is possible to combine The spatial parameter CLDO to CLD4 represents the combined spatial parameter CLDct. At the same time, the expansion result of PC/2 + PLFE/2 of Equation 6 to Equation 4 is as shown in Equation 7: [Formula 7] PC/2 + PLFE/2 = [(cl, OTT4)2 + (c2, 〇 TT4) 2] *(c2, OTTl*cl, OTTO)2 * m2 /2 In this example, according to the definition of cl and c2 (please refer to Equation 5), because (cl,x)2 + (c2,x)2 =b gives (cl,OTT4)2 + (c2,OTT4)2 =b Therefore, Equation 7 can be simplified as follows: [Formula 8] PC/2 + PLFE/ 2 = (c2, OTTl*cl, OTTO)2 * m2/2 Therefore, by inputting Equation 8 and Equation 6 to Equation 4, and inputting Equation 4 to Equation 1, it is possible to express the combination by combining the spatial parameters 0030 to CLD4. Spatial parameters CLDa ° 201145263 (2)-llb channel-related ICCa export First, because the inter-channel correlation ICCa is the correlation between the left output signal Lt and the right output signal Rt, the result of inputting the left output signal Lt and the right output signal to the corresponding definition formula is as follows: [Equation 9] ICCa= :公式. , where. In Equation 9, PLt and PRt can be expressed using the spatial parameters CLD0 to CLD4 in Equation 4, Equation 6, and Equation 8. PLtPRt can be expanded by the method of Equation 10. [Formula 10] PLtRt = PLR + PLsRs + PC/2 + PLFE/2 In Equation 10, 'PC/2 + PLFE/2' can be expressed as spatial parameters CLD0 to CLD4 according to Equation 6. PLR and PLsRs can be expanded as follows according to the definition of ICC: [Equation 11] ICC, P (4) In Equation 11, if the term or ^^ is shifted, Equation 12 is obtained. [Formula 12] plr=icc,* v Fr

PlsRs = ICC ^PijPrs In Equation 12, PL, PR, PLs, and PRs can be expressed as spatial parameters CLD0 to CLD4 according to Equation 6. The result of inputting Equation 6 to Formula 12 corresponds to Formula 13. 21 201145263 [Formula B] PLR=ICC3 *cl,OTT3 *c2,OTT3 *(cl,OTTl*cl,OTTO)2 *m2 PLsRs=ICC2 *cl,OTT2 *c2,OTT2 *(c2,OTTO)2 *m2 In summary, by inputting Equation 6 and Equations 13 to 10, inputting the formula, and Equations 4 to 9, the combined spatial parameter iCCa can be expressed by the spatial parameters CLD0 to CLD3, ICC2, and ICC3. (5) The fifth embodiment of the -1-2 tree configuration (5-1-52 tree configuration) "Fig. 6" is a schematic diagram of another example of applying the combined spatial information. Please refer to the left part of "Picture 6". CLD0 to CLD4 and ICC0 to ICC4 (not shown) can be called spatial parameters' which can be used for calculation in the downmixing process of 51 channels of multichannel audio signals. In the spatial parameter, the channel-to-channel difference between the left channel signal L and the left surround channel signal Ls is CLD3, and the channel-to-channel correlation between the left channel signal L and the left surround channel signal Ls is ICC3. The channel-to-channel difference between the right channel R and the right surround channel rs is CLD4, and the channel-to-channel correlation between R and Rs is ICC4. On the other hand, please refer to the right part of 'Fig. 6', if the combined spatial parameter β) and iccp to the single-downmix audio signal m, the left channel signal Lt and the right channel signal Rt are generated. The stereo output channel audio signal and the appearance can be directly generated from a single downmix audio signal. In this example, the combined spatial parameters CLD0 and κχβ can be calculated by combining the spatial parameters CLD0 to CLD4 and ICC〇 to ICC4. In the following, first, the process of calculating the CLDP in the combined spatial parameters by calculating the spatial parameters CLD〇 to CLD4 is explained, and then interpreting the combined spatial parameters CLD0 to CLD4 and ICC0 to ICC4 to calculate the combined spatial parameters. The process of (Χ) (2)-l_2-a spatial parameter CLDp First, since the spatial parameter CLDP is the difference between the left output signal Lt and the right output signal Rt, the left output signal Lt and the right are input. The output signal 玢 to the mouth; the result of the definition formula of ^ is as follows: [Formula 14] CLDP = 10*logl0(PLt/PRt) where 'PLt is the power of the left output signal Lt, and PRt is the right output signal Rt [Equation 15] CLDP = 10*logl0(PLt+a/PRt+a) where 'PLt is the power of the left output § Lt, and PRt is the power of the right output signal Rt, the V system is very small Therefore, the spatial parameter 〇Χ) β is defined by Equation 14 or Equation 15. At the same time, in order to use the spatial parameters CLD0 to CLD4 to represent PLt and PRt, it is necessary to output the left output signal Lt of the channel audio signal, the right output signal of the output channel audio signal and the multi-channel signal: 1, 1 (8, ft, 118, (3) And the relationship between 1^ ugly • The corresponding relation can be defined as follows: [Formula 16]

Lt = L + Ls + C/V2 + LFE/V2 23 201145263

Rt = R + Rs + C/V2 + LFE/V2 Since the relationship similar to Equation 16 can be varied depending on how the output channel tone step number is defined, it can also be defined in a different manner than Equation 16. For example, ‘1/stone in LFE/W can be ‘〇’ or ‘r. Equation 16 can derive the following formula 17: [Formula 17] PLt = PL + PLs + PC/2 + PLFE/2 PRt = PR + PRS + PC/2 + PLFE/2 According to Equation 14 or Equation 15, PLt can be used as well PRt represents the spatial parameter CLDp. According to Equation 15, pLt and PRt can be expressed using PL, PLs, PC, PLFE, PR, and pRs. Therefore, it is necessary to find a relation that can express PL, PLs, Pc, PLFE, PR, and PRs using the spatial parameters CLD0 to CLD4. At the same time, if the tree configuration is as shown in Figure 6, the relationship between the multi-channel audio signal, R, c, LFE, Ls, Rs) and the single downmix channel signal m is as follows: [Equation 18 ;)

L

Ls

R

Rs

C

LFE CU〇mC\tOTr\C\, OTTQ Du C2, OTn>C\, OTr\C\, OTTO C\, O7T4^2, OTT\Ch〇TT0 m - C2, Oir4C2, OTT\C\, OTTO Dc C\tOTT2C2, OTTO _ C2, O772C2, O7T0 _ ΓΧ & ν 10~

CLDX 10

1 + 10 of them

1 + 10^ 201145263 Equation 18 derives the following formula 19: [Formula 19] -PL- (cu〇mcwmcu〇Tr〇) Pu (C2,07T3C1,07T1C1,〇7T〇) Pr (C\y〇TT4C2f〇rr\ C\ ,ΟΤΤΟ ) (C2, OTT4C2, OTT\C\, 〇TTO) Pc iC\, OTT2C2t〇rr〇^ J*LFE- (C2, OTT2C2, O7T0^ _ ίο 10 [~~ϊ ^·σΓΓ* = \ ϋΓ ton = -5 ΞΓ where ΙΙι+ηΠ7- , Vi+ioi-. In particular, enter the formula 19 to the formula π, and enter the formula π to the formula 14 or the formula 15, then the way to combine the spatial parameters CLD0 to CLD4 Indicates the combined spatial parameter CLDP. At the same time, enter formula 19 to PL + PLs in the formula π, and the resulting expansion formula is as shown in Equation 20: [Formula 20] PL + PLs = [(cl, OTT3) 2 + (c2, OTT3)2] (cl, OTTl*cl, 〇TTO)2 *m2 In this example, according to the definition of cl and C2 (compare formula 5), since (ci, x) 2 + (c2, x) 2 =1, So get (ci, 〇 TT3) 2 + (c2, 〇 TT3) 2 = 1. So 'Formula 20 can be simplified as follows: [Formula 21] PL_ = PL + PLs = (cl, OTTl*cl, OTTO)2 *m2 On the other hand, enter PR + PRs in Equation 19 to Equation 17, and get the exhibition 25 201145263 As shown in Equation 22: [Formula 22] PR + PRs = [(cl, 〇 TT4) 2 + (c2, OTT4) 2] (cl, OTTl * cl, OTTO) 2 * m2 In this example 'According to Cl and C2 The definition (please refer to Equation 5), since (cl, x) 2 + (c2, x) 2 = l, so (cl, 〇 4) 2+ (c2, OTT4) 2 = l. So 'Formula 22 It can be simplified as follows: [Formula 23] PR_ = PR + PRs = (c2, OTTl * cl, 〇 TTO) 2 * m2 On the other hand, enter Equation 19 to PC/2 + PLFE/2 of the formula π, and expand the result of the formula As shown in Equation 24: [Formula 24] PC/2 + PLFE/2 = [(cl, 〇 TT2) 2 + (c2, OTT2) 2] (C2, OTTO) 2 * m2 /2 In this example 'according to cl And the definition of C2 (please refer to Equation 5). Since (cl,x)2 + (c2,x)2 =1, we get (ci,〇tx2)2 + (c2,〇TT2)2 = 1. Therefore, Equation 24 can be simplified as follows: [Formula 25] PC/2 + PLFE/2 = (c2, OTTO) 2 * m2 /2 Therefore 'Enter Equation 21, Equation 23, and Equation 25 to Equation π, and enter Equation 17 to Equation 14 or Equation 15 can express the combined spatial parameter CLDp by combining the spatial parameters CLD0 to CLD4. 26 a 201145263 (2)-l-2-b Spatial parameter ICCp derivation First, since the spatial parameter ICCp is the channel-to-channel correlation between the left output signal Lt and the right output signal Rt, the left output signal Lt and the right output signal are input. The result of Rt to the corresponding definition formula is as follows: [Formula 26] ICC = _ A , where. In Equation 26, according to Equation 19, the spatial parameters CLD0 to CLD4 can be used to represent PLt and PRt. PLtPRt can be expanded by the method of Equation 27 as: [Formula 27] PLtRt = PL_R_ + PC/2 + PLFE/2 In Equation 27, 'PC/2 + PLFE/2' can be expressed as the spatial parameter CLD0 according to Equation 9. CLD4. PL_R_ can be developed as follows according to the definition of ICC: [Equation 28] ICC, = PL R "(PL PR ) If the term is shifted, Equation 29 is obtained: [Formula 29] In Equation 29, according to Equation 21 and Equation 23, PL And ρι^ can be expressed as spatial parameters CLD0 to CLD4. The formula obtained by inputting the formula 21 and the formula 23 to the formula 29 corresponds to the formula 30:

[Formula 30J 27 201145263 PL-R- = ICC1 *cl, 0TTl *cl, 〇TT0 *c2, OTTl *cl, OTTO *m2 In summary 'Enter Equation 30 to Equation 27, and enter Equation 27 and Equation Π to Equation 26, The combined spatial parameter iccp can then be represented by spatial parameters CLD0 to CLD4 and ICC1. The ±$ solution __ parameter. The positive method is just a real complement. The process towel of ρχ or Pxy can be changed into a plurality of forms by considering the inter-channel _ (for example, ICC(), etc.) between each channel and the additional energy reduction. (2)-2 Combined spatial information with surround effects First, if a sound path is considered, a virtual surround effect can be generated by combining spatial information to generate combined spatial information. A virtual surround effect or a virtual 3D effect can produce the effect of a speaker that substantially has a surround channel without the speaker surrounding the channel. For example, a 5.1 channel audio signal is output through two stereo speakers. The sound path may correspond to spatial filter information. The spatial filter information can use a function called head-related transfer fimeticm (HRTF), but the invention is not limited thereto. Spatial filter information can include filter parameters. By inputting filter parameters and spatial parameters to the conversion formula, combined spatial parameters can be generated. The resulting combined spatial parameters may include level coefficients. In the following, assuming that the multi-channel audio signal is 5 channels and generating a three-channel output channel audio signal, a method of considering the sound path to produce a combined spatial information with a surround effect is explained below. S: 28 201145263 "Figure 7" is a schematic diagram of the sound path from the speaker to the listener, showing the location of the speaker. Please refer to Figure 7. The positions of the three speakers SPK1, SPK2 and SPK3 are located at the left front L, the center C and the right front R, respectively. The positions of the virtual surround channels are left surround Ls and right surround RS, respectively. The figure shows the positions L, C and R of the three speakers and the positions Ls and Rs of the virtual surround channels to the positions r and 1 of the listener's left and right ears, respectively. 'Gx_y' represents the sound path from position x to position y. For example, 'GL_r' represents the sound path from the left front position L to the listener's right ear position Γ. If the speaker is present at five locations (for example, the speaker is also in the position of the left surround Ls and the right surround Rs), and the listener is in the position shown in the "γ map", the signal L0 entering the listener's left ear and entering the listener are entered. The signal R〇 of the right ear can be expressed by Equation 31: [Equation 31] L0 = L*GL_1 + C*GC J + R*GR_1 + Ls*GLs_l + Rs*GRs_l R0= L*GL-r + C*GC_r + R *GR_r + Ls*GLs_r + Rs*GRs_r, where L, C, R, Ls, and RS are the channels of each position, and Gx_y represents the sound path from position x to position y, indicating convolution. However, as described above, if only three positions L, c, and R have speakers, the signal L0_real entering the listener's left ear and the signal R0_real entering the listener's right ear are respectively expressed as follows: [Formula 32] 29 201145263 LOrea *GLJ + C*GC—1 + R*GR 1 RO_real = L*GL_r + C*GC—r + R*GR r Since the signal shown in Equation 32 does not take into account the surround channel signals Ls and Rs ', it cannot be generated. Virtual surround effect. ^ The virtual surround effect is generated so that the position Ls' from the speaker reaches the listener position 〇, r) the left surround channel signal Ls is equal to the position of each speaker L, c and R different from the initial position £Ls' Location (1, 〇 环绕 surround channel domain Ls. Can also lie in the example of the right surround channel signal RS. Further study the left surround channel signal Ls, if the left surround channel signal Ls is output from the left surround position Ls, as The initial position of the speaker reaches the listener's left and right ears 1 and r, respectively, as follows: [Formula 33] 'Ls*GLs_l', 'Ls*GLs_r, if the right surround channel signal RS is output from the right surround position Rs, as an initial The position of the speaker H, the signal to the listener's left and right ear and r, respectively, is expressed as follows: [Formula 34] <Rs*GRs-1', 'Rs*GRs r, if the listener reaches the left and right ear and the squat The signal is equal to the components of Equation 33 and Equation 4. Even if the speaker is output via any position of the speaker (for example, via the left front speaker SPK1), the listener can feel as if the speaker system is located respectively. Surround position Ls, and Rs, at the same time, if the component shown in Equation 33 is output from the left surround position Ls, the speaker 30 -

S 201145263 ' is the signal to reach the listener's left and right ear and r. Therefore, if the component shown in the formula 33 is completely output from the speaker SPKi at the left front position, the positions of the left and right ears 1 and r reaching the listener are as follows: [Form 35]

Ls GLs l*GL-1' 'Ls*GLs-r*GL_r, the formula 35' corresponds to the component of the sound path from the left front position L to the listener's left ear 1 (or right ear). (.1*证_〇 is added. The signal to the left and right ears 1 and Γ of the receiver should be the formula 33 instead of the formula 35: component. If the left front position [the sound of the speaker at the ring reaches the listening GL' n ° , 33 2 ^ From the left _ L _ SPK1, _ sound path should consider the inverse function 刀 of the knife I — (or 'GL, r,), (or “certificate ^ ^,). The component output corresponding to Equation 33 from the left front position should be corrected to the following formula: SPK1 [Formula 36]

Ls GLsJ*GL_>i’, ‘Ls*GLS-r*GL_r_r speakers

If the component corresponding to the formula 34 is output from the left front hatching L SPK1, the correction is as follows: [Formula 37]

Rs GRsJ*glJ.p , ^Rs*GRs r*GL_l-r • Therefore, the signal l of the speaker SPK1 output from the left front position L can be summarized as 31 201145263 [Formula 38] L'=L + Ls*GLs”* GL"-1+rs*gRs 1*GL 1-1 — _ (Omit Ls*GLs_r*GL_j-l and Rs*GRs_r*GL_l-l.) If the signal shown in Equation 38 is output from the left front position L The speaker spK1 arrives at the listener's left ear position and the sound path counts 'GLJ' is increased. Therefore, 'GL-1' in Equation 38 cancels each other, and finally retains the formula % and the factor shown by Formula 34. The "Fig. 8" is sparsely _ the signal from the sound detectors to generate a virtual surround effect. Referring to Fig. 8"", if the sound path is considered to be good, the surround channel from the surrounding positions a and Rs, and the Rs are included in the signal L' output from the brain position of the speaker, corresponding to the formula %. In Equation 38, GLsJ^ is abbreviated as hls and can therefore be expressed as follows: [Formula 39]

V= L + Ls*HLs_L + Rs*HRs_L For example, the speaker HSPK2 at the central position C is transmitted (four) 峨C, which is summarized as follows: [Formula 40]

C'= C . Ls*HLs—C + Rs*HRsC For example, the speaker HSPK3 input signal r at the right front position R is summarized as follows. [Formula 41]

R - R + Ls*HLs_R + Rs*HRs_R "Figure 9" Contact level _ formula %, formula 39 or formula 201145263 40 5-channel signal to generate a 3-channel signal concept 意图 Intention. If the 5-channel signal R' and L' are generated using the 5-channel signal, or the surround channel signal Ls or Rs is not included in the central channel signal C', HLs_C or HRsc becomes 0. For ease of implementation, Hx_y can be modified in a number of ways, such as replacing Hx_y with Gx_y or considering crosstalk when using Hx_y. The above detailed explanation is an example of combined spatial information with a surround effect. Obviously, it can be changed according to the application method of spatial filter information. As described above, the signal output through the speaker (the left front channel L, the right front channel R', and the central channel C' in the above example) can generate a self-downmix audio signal through the combined air information according to the above process, especially The combined spatial parameters are used. (3) Expanding spatial information First, by adding extended space information to spatial information, expanded spatial information can be generated. Then you can use the extended space information to upmix the audio signal. In the corresponding upmixing process, the 'space-based information' audio signal is converted into a primary upmix audio signal, and then based on the extended space information, the primary upmix audio signal is converted into a second upmix audio signal. In this example, the extended space information can include extended channel configuration information, extended channel mapping information, and extended spatial parameters. The extended channel configuration information is information for the configurable channel, and the channel can be configured by the tree configuration information of the spatial information. The extended channel configuration information may include at least one of a division identification code and a non-partition identification code, which will be explained in detail below. Extension 33 201145263 The channel mapping information is the location information of each passway of the test extension channel. The extended space parameter can be upmixed - one channel is lighter and less expensive. The parameter between delays can be = with the difference between the channels. The extended extension recorded above may be included in the spatial information after being generated by the encoding device (1) or the decoding device itself (ϋ). If the extended space information is generated by the encoding device, the presence or absence of the extension may depend on the indicator of the spatial information. If the extended spatial information is generated by the decoding device itself, the extended space parameter of the extended space - §fl can be calculated using the spatial parameters of the spatial information. At the same time, the process of upmixing the audio signals using the expanded spatial information generated based on the spatial information and the extended spatial information can be performed continuously and hierarchically or in combination and in a synthetic manner. If the space is calculated based on the information of the resources such as Zicheng and Yanliang, the video can be combined and directly mixed into a multi-channel audio signal. In this example, the factors of the configuration matrix can be defined in terms of spatial parameters and extended space parameters. In the following, after the example interpretation of the extended space information by the encoding device is completed, an example of generating extended space information through the decoding device itself will be explained. (3) Example of generating extended space information by the encoding device: arbitrary tree configuration First, by adding extended space information to spatial information, the encoding device generates expanded spatial information. An example of the decoding device receiving this extended space information is then explained. In addition, the extended space information can be taken from the process of downmixing the multi-channel audio signal by the encoding device.

34 S 201145263 As mentioned earlier, the extended space information includes extended channel configuration information, extended channel mapping information, and extended space parameters. In this example, the extended channel configuration information may include at least one of a partition identification code and a non-partition identification code. Hereinafter, the process of configuring the extended channel according to the division and the array of non-partitioned identification codes will be explained in detail. "Fig. ίο" is a schematic diagram of an embodiment based on configuration information of an extended channel to configure an extended channel. Please refer to the lower end of "Picture 10", and the 〇 and 1 series are repeatedly arranged in a sequence. In this example, 'G denotes a non-divided identification code, and 丨 denotes a division identification code. The non-divided identification code 0 is located at the first-order (1), and the channel matching the non-partitioned identification code of the first-order is the left channel L, which is at the uppermost end. Therefore, the left channel L matching the non-divided identification code is selected as the output channel instead of _. In the second order (2), there is a division identification code 1. The channel matched to the division identification code is the left surround channel Ls adjacent to the left channel L. Therefore, the left surround channel Ls of the 眺_marriage code 1 is divided into two channels. There is a non-divided identification code 班 in the class ', ' and the fourth order (4), and the left surround channel Lst ( (4) _ channel is completely cleared as the output channel, and the above process is repeated to the last order (10). Then the entire extension channel can be configured. The number of m-channel division processes is equal to the number of division identification codes 1, and the number of processes that emphasizes the channel as the output channel is equal to the number of non-partitions (four)〇. The number of channels and the number of AT1 is equal to the division ID! 35 The number of 201145263 (2), the number of extended channels (L, Lfs, Ls, R, Rfs, Rs, c^LFE) is equal to the number of non-partitioned identification codes ( (8). At the same time, the extended channel is configured to map the position of each output channel using the extended channel mapping information. For the example towel of "1G", the order of mapping is as follows: left clipping channel L, left front channel Lfs, left surround channel Ls, right front channel R right side channel Rfs, right surround channel Rs, central channel C, and low frequency channel LFE. As described above, information can be configured based on the extended channel to configure the extended channel. Therefore, it is necessary to divide the channel into a pass_minute unit of at least two channels. When dividing a channel into at least two channels, the pass-by unit can make a secret space parameter. Since the number of extension work parameters is equal to the number of channel age units, it is also equal to the number of divided horses. Therefore, the number of times the extension space parameter is taken may be equal to the number of division identification codes. Figure 11 is a schematic diagram showing the relationship between the configuration of the extended channel and the parameters of the extended space as shown in the "Figure 1". "Monthly reference "Figure 11", applied to the two channel division unit ΑΤ0 and the extended space parameters ATDQ and ATm on ATI are shown in the figure. If the extended spatial parameter is the inter-channel step difference, the channel dividing unit can determine the order of the two divided channels using the extended space parameter. Therefore, by adding the extended space parameter to complete the upmixing process, the extended space parameter does not need to be fully applied, and * is partially applied. (3)-2 Example of generating extended space information: interpolation/extrapolation

36 S 201145263 First, by adding extended space information to spatial information, it will be able to generate expanded spatial information. The τ plane will explain an example of using spatial information to generate extended spatial information. In particular, the 'space parameter using spatial information' can generate extended space information. In the entire example, 'axis interpolation, extrapolation, or a similar method can be used. (3) -2-1 extends to 6.1 channel If the multi-channel audio signal is 5.1 channel, the case of generating the output channel audio signal of 6.1 channel is explained by the following example. Figure 12 is a schematic diagram of the location of the multichannel audio signal of the channel and the location of the audio signal of the output channel of the 61 channel. Please refer to "Fig. 12A" to see that the channel position of the multichannel audio signal of channel 1 is left front channel L, right front channel R, central channel c, low frequency channel (not shown) LFE, left surround channel Ls and right surround channel Rs. In the case where the 5.1 channel multi-channel audio signal is a downmix audio signal, if the spatial parameter is applied to the downmix audio signal, the downmix audio signal will be upmixed again into a 5.1 channel multi-channel audio signal. . However, the channel signal of the central RC should be further generated after the "Fig. 12B" is shown to 'mix the downmix audio signal into a multichannel audio signal of 6 channels. The channel parameters associated with the rear central RC can be generated using the spatial parameters associated with the two rear channels (left surround channel LS and right surround channel RS). In particular, the inter-channel level difference (CLD) in the spatial parameter indicates the step difference between the two channels. Therefore, by adjusting the step difference between the two channels, it is possible to change the position of the virtual sound source between the two channels. The principle that the virtual sound source varies according to the position difference between the two channels is explained below. Fig. 13 is a diagram showing the relationship between the position of the virtual sound source and the step difference between the two channels, wherein the left and right surround channels Ls and the steps are 'a, and 'b', respectively. Please refer to "Fig. 13A". In the case where the level a of the left surround channel Ls is larger than the level b of the right surround channel Rs, it can be seen that the position of the virtual sound source vs is closer to the position of the left surround channel Ls than the right surround The location of the channel Rs. If the audio signal is output from two channels, the listener perceives that the virtual sound source vs essentially exists between the two channels. In this example, the virtual sound source vs is located closer to the channel position with a higher level. In the case of Fig. 13B", since the level a of the left surround channel ls is almost equal to the level b of the right surround channel RS, the listener perceives that the position of the virtual sound source vs is in the left and right surround channels Ls and the right surround channel Rs. Central location between the two. Therefore, the above-described principle can be used to determine the level of the rear central position. Figure 14 is the intention of the order of the two rear channels and the order of one rear central channel. Please refer to "Fig. 14". By interpolating the difference between the level a of the left surround channel Ls and the level b of the right surround channel RS, the post-central channel ruler (: level c can be calculated. In this example, the calculation Non-linear interpolation or linear interpolation can be used. The following equations can be used to calculate two channels based on linear interpolation (for example)

38 S 201145263

A new channel between Ls and Rs) (for example, the rear central channel ruler) level c: [Formula 40] c = a*k + b*(lk) Let 'a and 'b' each be the order of two channels 'k' is the relative position between the channel of the level & the channel of the level b and the channel of the level c. If the channel of the level e (for example, the rear central channel RC) is located at the center position between the channel of the level & (e.g., Ls) and the channel of the level b, then 'k, 〇5. If 'k' is 〇_5, the formula 40 will become the formula 41. [Formula 41] c = (a + b)/2 According to Equation 41, if the channel of the level c (for example, the rear central channel Rc) is located at a central position between the channel of the step a (for example, Ls) and the channel Rs of the step b, The level c of the new channel corresponds to the average of the steps of the previous channel. Further, Equation 40 and Formula 41 are only representative. Therefore, it is also possible to readjust the result of the level c and the values of the level a and the level b. (3) When -2-2 is extended to 7.1 channels and the audio channel of the circum-channel is 5.1 channels, an example of the audio signal of the output channel attempting to generate the channel will be explained below. Figure b is a schematic diagram explaining the position of the 5.1 channel multi-channel audio signal and the position of the 7.1 channel output channel audio signal. Please refer to Figure 15A. Similar to Figure 12A, it can be seen that the position channels of the multi-channel audio signals of the 5" channel are left front channel L, right front channel r, medium 39 201145263 central channel C, low frequency channel ( The LFE, the left surround channel Ls, and the right surround channel Rs are not shown. In the case where the 5, 1 channel multi-channel audio signal is a downmix audio signal, if the spatial parameter is applied to the downmix audio signal, the downmix audio signal will be upmixed again to 5.1 channels. Channel audio signal. However, the left front channel Lfs and the right front channel Rfs as shown in Fig. 15B should be generated to upmix the downmix audio signal into a multichannel audio signal of 7 channels. Since the left front side channel Lfs is located between the left front channel L and the left surrounding channel Ls, the level of the left front side channel Lfs can be determined by interpolation using the level of the left front channel L and the level of the left surrounding channel Ls. Figure 16 is a schematic diagram explaining the order of two left channels and the order of a left front channel (Lfs). Referring to Fig. 16, it can be seen that the level c of the left front side channel Lfs is a linear interpolation value based on the level a of the left front channel L and the level b of the left surrounding channel Ls. Meanwhile, although the left front side passage Lfs is located between the left front passage 1 and the left surround passage Ls, it may be located outside the left front passage L, the center passage 匚, and the right front passage R. Therefore, the steps of the left front channel Lfs can be determined by extrapolation using the steps of the left front channel L, the central channel C, and the right front channel R. Figure 17 is a diagram explaining the steps of the three front channels and the steps of the left front channel. Please refer to "Fig. 17". As can be seen, the level of the left front channel Lfs 201145263 d is based on the linear extrapolation of the level a of the left front channel L, the level c of the central channel C, and the level b of the right front channel R. . In the upmixing process using extended space information, the extended spatial parameters may not need to be fully applied, but may be partially applied. Thus, the process of applying spatial parameters to audio signals can be performed sequentially and hierarchically or in combination and synthetically. Industrial Applicability Accordingly, the present invention provides the following effects. First, the present invention is capable of producing an audio signal that includes a configuration that is different from a predetermined tree configuration to produce various configured audio signals. Second, because the generated audio signal contains a configuration different from the predetermined tree configuration, even if the number of multi-channels before performing downmixing is smaller or larger than the number of speakers, the self-downmix audio signal can be generated with a speaker equal to The number of rounded out channels. Second, in the case of generating an output channel having a number smaller than the number of channels, since the multi-channel audio signal directly generates the self-downmix audio signal, instead of downmixing the output channel audio signal from the multi-channel audio signal, wherein The multi-channel audio signal is generated by the upmix-downmixer, so (4) considerably reduces the amount of work required to decode the audio signal. The fourth 'because of the need to consider the acoustic trajectory when producing the lang information, the present invention can provide a pseudo-surround effect without being able to achieve the surround channel output. Although the present invention has been disclosed above in the foregoing preferred embodiments, it is not intended to limit the invention. It will be appreciated by those skilled in the art that the modifications and variations of the present invention are intended to be within the scope of the invention as defined by the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an audio signal encoding apparatus and an audio signal decoding apparatus of the present invention; FIG. 2 is a block diagram of an embodiment of applying partial spatial information; Shown is a block diagram of another embodiment of applying partial spatial information; FIG. 4 is a block diagram of still another embodiment of applying partial spatial information; and FIG. 5 is an implementation of application combined spatial information. Figure 6 is a block diagram of another embodiment of the application of combined spatial information; Figure 7 is a schematic diagram of the sound path of the speaker to the listener, showing the position of the speaker; Figure 8 is a schematic diagram showing the output signal of each position of the speaker for generating the surround effect; Figure 9 is a conceptual block diagram of the method for generating a 5-channel job by the 5-channel shout; the 10th is based on the extended channel Schematic diagram of the embodiment of the city's configuration extension channel; the figure is to explain the extension channel configuration shown in Figure 10 and the relationship with the extended space parameters; 'I2 picture is the channel multi-channel Frequency signal and output of ^ channel S1 42 201145263 Schematic diagram of the position of the channel audio signal; Figure 13 is a schematic diagram of the relationship between the position of the virtual sound source and the difference between the two channels; Figure 14 is to explain two Schematic diagram of the level of the rear channel and the level of a rear central channel; Figure 5 is a schematic diagram explaining the position of the multi-channel audio signal of the 5 channel and the position of the audio signal of the output channel of the 71 channel; Figure 16 is an explanation A schematic diagram of the order of two left channels and the order of one left front channel (Lfs); and the second diagram is a schematic diagram explaining the steps of the three front channels and the order of one left front channel (Lfs). [Description of main component symbols] 100 encoding device 110 downmixing unit 120 spatial information capturing unit 200 decoding device 210 output channel generating unit 220 modified spatial information generating unit 230 spatial filter information d downmix audio signal S spatial information 43 201145263 IN_M Multi-channel audio signal OUT-N Output channel audio signal s' Corrected spatial information L Left front channel Ls Left surround channel C, RC Central channel LFE Low frequency channel R Right front channel Rs Right surround channel Lt Left total channel ct Central total channel Rt Right Total channel L〇' R〇 stereo downmix channel CLD channel step difference ICC channel correlation or homology CPC channel prediction coefficient M number of channels of multichannel audio signal n number of channels of output channel audio signal m single downmix audio signal SPK1 'SPK2, SPK3 speaker ATO, ATI channel division unit VS virtual sound source 201145263

Lfs Left front channel Rfs Right front channel a Left surround channel level b Right surround channel level c Center channel level R,, l, σ Signal 45

Claims (1)

201145263 VII. Patent application scope: 1_ A method for decoding an audio signal, comprising: receiving a spatial information; using the spatial information to generate a combined spatial information; and decoding the audio signal by using the combined spatial information, wherein the hybrid signal The m information system is generated by combining a plurality of spatial parameters included in the spatial information. 2. The method for decoding an audio signal as described in claim 1, wherein the combined spatial information is generated by inputting the spatial parameters to a conversion formula. 3. The method for decoding an audio signal as described in claim 2, wherein the conversion formula is determined according to tree configuration information of one of the audio signals. 4 'If the patent application is turned over, the decoding method of the audio code described in item 1, wherein the combined spatial information is generated based on an output channel information. 5. The method for decoding an audio signal according to claim 1, wherein the audio signal is a downmix audio signal generated by downmixing a multi-channel audio signal and the four spatial parameters are in the multi-channel The downmixing process of the audio signal is determined according to a predetermined tree configuration. 6. The method for decoding an audio signal according to claim 1, wherein the audio signal is a signal generated by downmixing a multi-channel audio signal, and the spatial parameters comprise one channel of the multi-channel audio signal. At least one of the inter-level difference values, and one of the spatial parameters of the combined spatial parameters, is calculated by dividing the inter-channel level difference value of the multi-channel audio signal in whole or in part. 46. The method for decoding an audio signal according to claim 1, wherein the audio signal is a signal generated by downmixing a multi-channel audio signal, and the spatial parameters comprise the multi-channel audio signal. At least one of the inter-channel correlation values, and one of the inter-channel correlation values of the combined spatial parameters is calculated by combining at least one of the inter-channel correlation values of the multi-channel audio signals. 8. The decoding method of the audio signal according to claim 7, wherein the spatial parameters further comprise at least one of the channel difference values of one of the multi-channel audio signals, and the spatial parameters are combined. The inter-channel correlation value is calculated by combining at least one of the inter-channel correlation values of the multi-channel audio signal with the inter-channel level difference of the multi-channel audio signal. 9. The method for decoding an audio signal according to claim 1, wherein the modified spatial information including the combined spatial information is generated using the spatial information, and the modified spatial information includes a part of spatial information and An extended space information is at least one of them. 10. A decoding device for an audio signal, comprising: a modified spatial information generating unit for generating a combined spatial information by using the spatial information; and an output channel generating unit for decoding the audio by the hybrid spatial information a signal, wherein the combined spatial information is generated by combining a plurality of spatial parameters included in the spatial information. 11. The solution of the audio signal described in claim 1G of the patent application, wherein the 201145263 combined spatial information is generated by inputting the spatial parameters to a conversion formula. 12. The decoding device for an audio signal according to claim 11, wherein the conversion formula is determined according to one of the audio signal tree configuration information. 13. The decoding device for an audio signal according to claim 10, wherein the combined spatial information is generated based on an output channel information. 14. The decoding device for an audio signal according to claim 10, wherein the audio signal is a downmix audio signal generated by downmixing a multi-channel audio signal, wherein the spatial parameters are in the multi-channel The downmixing process of the audio signal is determined according to a predetermined tree configuration. The decoding device for an audio signal according to claim 10, wherein the audio signal is a signal generated by downmixing a multi-channel audio signal, and the spatial parameters comprise an inter-channel level of the multi-channel audio signal. At least one of the differences, and one of the spatial parameters of the combined spatial parameters, is calculated by combining the multi-channel level differences of the multi-channel audio signals in whole or in part. 16. The decoding device for an audio signal according to claim 10, wherein the audio signal is a signal generated by downmixing a multi-channel audio signal, and the spatial parameters comprise one channel of the multi-channel audio signal. At least one of the inter-correlation values, and one of the inter-channel correlation values of the spatial parameters that are combined, is calculated by combining at least one of the inter-channel correlation values of the multi-channel audio signals. 17. The decoding device for an audio signal according to claim 16, wherein the spatial parameter such as S 48 201145263 further includes a step difference between the channels of the multi-channel audio signal, at least - the 'experienced scale parameter The inter-channel_value is calculated by at least one of the inter-channel correlation value of the multi-channel audio signal combined with the inter-channel level difference of the multi-channel audio signal. 18. The decoding device for an audio signal according to claim 1, wherein the modified spatial information including the sigma combined spatial information is generated using the spatial information, and the modified spatial information includes a part of the spatial information. At least one of the information with an extended space. 49