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WO2015009040A1 - Codeur et procédé de codage pour signal multicanal, ainsi que décodeur et procédé de décodage pour signal multicanal. - Google Patents

Codeur et procédé de codage pour signal multicanal, ainsi que décodeur et procédé de décodage pour signal multicanal. Download PDF

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Publication number
WO2015009040A1
WO2015009040A1 PCT/KR2014/006406 KR2014006406W WO2015009040A1 WO 2015009040 A1 WO2015009040 A1 WO 2015009040A1 KR 2014006406 W KR2014006406 W KR 2014006406W WO 2015009040 A1 WO2015009040 A1 WO 2015009040A1
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Prior art keywords
channel signal
signal
lfe
encoding
downmix
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PCT/KR2014/006406
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English (en)
Korean (ko)
Inventor
백승권
성종모
이태진
강경옥
서정일
김진웅
이용주
장대영
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority to EP14826617.4A priority Critical patent/EP3023984A4/fr
Publication of WO2015009040A1 publication Critical patent/WO2015009040A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing

Definitions

  • the following embodiments relate to an encoder and an encoding method for a multichannel signal, a decoder and a decoding method for a multichannel signal, and more particularly, to a codec for efficiently processing a multichannel signal composed of a plurality of channel signals. .
  • a new technique for compressing / transmitting AV media is needed.
  • ultra-high quality audio content it is important to accurately represent the audio quality and the multi-channel sound field rather than the requirement for backward compatibility.
  • a 22.2 channel audio signal is intended for ultra-high quality audio sound field reproduction, rather than being compressed / transmitted for backwards compatibility, it is a high quality multichannel that can express the inherent sound quality and effect of the content as it is. Audio coding technology is required.
  • the present invention provides an apparatus and method for encoding or decoding a multichannel signal comprising an Lfe channel signal.
  • the present invention provides an apparatus and method for performing a process of performing two steps of encoding / decoding or applying a time delay to one step of encoding / decoding.
  • a method of encoding a multichannel signal includes the steps of: encoding a first general channel signal and a first Lfe channel signal included in a multichannel signal to output a first downmix signal and a first spatial cue; ; Encoding a second general channel signal and a second Lfe channel signal included in the multichannel signal to output a second downmix signal and a second spatial cue; Encoding the first downmix signal and the second downmix signal together; And generating a bitstream including the encoded first downmix signal and the second downmix signal, and a first spatial cue and a second spatial cue.
  • the outputting of the first spatial cue may include outputting a first downmix signal and a first spatial cue by applying parametric coding to the first general channel signal and the first Lfe channel signal according to an Lfe mode.
  • the outputting of the second spatial cue may include outputting a second downmix signal and a second spatial cue by applying parametric coding to the second general channel signal and the second Lfe channel signal according to an Lfe mode, and outputting the first spatial cue.
  • the cue and the second spatial cue may include a channel level difference (CLD) output from an Lfe band of the first Lfe channel signal or the second Lfe channel signal.
  • CLD channel level difference
  • a method of encoding a multichannel signal includes the steps of: encoding a first general channel signal and a first Lfe channel signal included in a multichannel signal to output a first downmix signal and a first spatial cue; ; Encoding a second general channel signal and a second Lfe channel signal included in the multichannel signal to output a second downmix signal and a second spatial cue; Encoding the first downmix signal; Encoding a second downmix signal separately from the first downmix signal; The method may include generating a bitstream including the encoded first downmix signal and the second downmix signal, and a first spatial cue and a second spatial cue.
  • the outputting of the first spatial cue may include outputting a first downmix signal and a first spatial cue by applying parametric coding to the first general channel signal and the first Lfe channel signal according to an Lfe mode.
  • the outputting of the second spatial cue may include outputting a second downmix signal and a second spatial cue by applying parametric coding to the second general channel signal and the second Lfe channel signal according to an Lfe mode, and outputting the first spatial cue.
  • the cue and the second spatial cue may include a channel level difference (CLD) output from an Lfe band of the first Lfe channel signal or the second Lfe channel signal.
  • CLD channel level difference
  • a method of encoding a multichannel signal includes: encoding a first Lfe channel signal and a second Lfe channel signal included in a multichannel signal to output a downmix signal and a spatial cue; Encoding the downmix signal; The method may include generating a bitstream including the encoded downmix signal and a spatial cue.
  • the outputting may include outputting a downmix signal and a spatial cue by applying parametric coding to the first Lfe channel signal and the second Lfe channel signal according to an Lfe mode, wherein the spatial cue is a first Lfe channel signal or It may include a CLD (Channel Level Diffenece) output from the Lfe band of the second Lfe channel signal.
  • CLD Chip Level Diffenece
  • a method of encoding a multichannel signal includes applying a time delay to a first Lfe channel signal included in a multichannel signal; Applying a time delay to a second Lfe channel signal included in the multichannel signal; Encoding a first Lfe channel signal to which the time delay is applied; Encoding a second Lfe channel signal to which the time delay is applied; And generating a bitstream including the encoded first Lfe channel signal and a second Lfe channel signal.
  • the time delay may include a time delay generated during encoding of a general channel signal included in the multichannel signal.
  • a method of encoding a multichannel signal includes applying a time delay to a general channel signal included in a multichannel signal; Encoding the normal channel signal to which the time delay has been applied; Outputting a downmix signal and a spatial cue by encoding the Lfe channel signal included in the multichannel signal; And encoding the encoded Lfe channel signal, wherein the time delay may include a time delay generated during the encoding of the Lfe channel signal.
  • the outputting may output a downmix signal and a spatial cue by parametric coding the Lfe channel signal according to an Lfe mode.
  • a method of decoding a multichannel signal comprising: generating a first downmix signal and a second downmix signal by decoding an encoding result extracted from a bitstream; Decoding the first downmix signal and outputting a first general channel signal and a first Lfe channel signal; And decoding the second downmix signal to output a second general channel signal and a second Lfe channel signal.
  • the outputting of the first general channel signal and the first Lfe channel signal may include applying a first spatial cue to parametric coding to output the first general channel signal and the first Lfe channel signal from the first downmix signal
  • the outputting of the second general channel signal and the second Lfe channel signal may include applying a second spatial cue to parametric coding to output a second general channel signal and a second Lfe channel signal from a second downmix signal
  • the first spatial cue and the second spatial cue may include a channel level difference (CLD) output from an Lfe band of a first Lfe channel signal or a second Lfe channel signal.
  • CLD channel level difference
  • a method of decoding a multichannel signal comprising: generating a first downmix signal by decoding an encoding result extracted from a bitstream; Decoding another encoding result extracted from the bitstream to generate a second downmix signal; Decoding the first downmix signal and outputting a first general channel signal and a first Lfe channel signal; And outputting a second general channel signal and a second Lfe channel signal by decoding the second downmix signal.
  • the outputting of the first general channel signal and the first Lfe channel signal may include outputting a first general channel signal and a first Lfe channel signal to the first downmix signal using parametric coding based on a first spatial cue.
  • the outputting of the second general channel signal and the second Lfe channel signal may include a second general channel signal and a second Lfe channel signal using parametric coding based on a second spatial cue on the second downmix signal.
  • the first spatial cue and the second spatial cue may include a channel level difference (CLD) output from an Lfe band of a first Lfe channel signal or a second Lfe channel signal.
  • CLD channel level difference
  • a method of decoding a multichannel signal comprising: generating a downmix signal by decoding an encoding result extracted from a bitstream; And decoding the downmix signal to output a first Lfe channel signal and a second Lfe channel signal.
  • the outputting may include applying a parametric coding based on a spatial cue to the downmix signal to output a first Lfe channel signal and a second Lfe channel signal, and the spatial cue is a first Lfe channel signal or a second Lfe channel signal. It may include a channel level difference (CLD) output from the Lfe band of the channel signal.
  • a parametric coding based on a spatial cue to the downmix signal to output a first Lfe channel signal and a second Lfe channel signal
  • the spatial cue is a first Lfe channel signal or a second Lfe channel signal. It may include a channel level difference (CLD) output from the Lfe band of the channel signal.
  • CLD channel level difference
  • a decoding method of a multi-channel signal includes: decoding a result of encoding extracted from a bitstream and outputting a first Lfe channel signal; Decoding another encoding result extracted from the bitstream and outputting a second Lfe channel signal; Applying a time delay to the first Lfe channel signal; And applying a time delay to the second Lfe channel signal.
  • the time delay may include a time delay generated in the decoding process of the general channel signal.
  • a decoding method of a multichannel signal includes decoding a general channel signal from a bitstream; Applying a time delay to the decoded general channel signal; Decoding an Lfe channel signal from the bitstream; And decoding the decoded Lfe channel signal.
  • the time delay may include a time delay generated during the decoding of the Lfe channel signal.
  • the decoding of the Lfe channel signal may output a downmix signal and a spatial cue by parametric coding the Lfe channel signal according to an Lfe mode.
  • the encoder of the multichannel signal encodes the first general channel signal and the first Lfe channel signal included in the multichannel signal, and outputs a first downmix signal and a first spatial cue.
  • a bitstream formatter for generating a bitstream including the encoded first downmix signal and the second downmix signal, and a first spatial cue and a second spatial cue.
  • the first encoder outputs a first downmix signal and a first spatial cue by applying parametric coding to the first general channel signal and the first Lfe channel signal according to Lfe mode, and the first encoder Parametric coding is applied to the second general channel signal and the second Lfe channel signal according to Lfe mode to output a second downmix signal and a second spatial cue, and the first spatial cue and the second spatial cue are first Lfe.
  • CLD Channel Level Diffenece
  • the encoder of the multichannel signal encodes a first general channel signal and a first Lfe channel signal included in the multichannel signal, and outputs a first downmix signal and a first spatial cue.
  • a bitstream formatter for generating a bitstream including the second spatial queue.
  • the first encoder outputs a first downmix signal and a first spatial cue by applying parametric coding to the first general channel signal and the first Lfe channel signal according to Lfe mode, and the first encoder Parametric coding is applied to the second general channel signal and the second Lfe channel signal according to Lfe mode to output a second downmix signal and a second spatial cue, and the first spatial cue and the second spatial cue are first Lfe.
  • CLD Channel Level Diffenece
  • An encoder of a multichannel signal includes: a first encoding unit for encoding a first Lfe channel signal and a second Lfe channel signal included in a multichannel signal to output a downmix signal and a spatial cue; A second encoding unit encoding the downmix signal; And a bitstream formatter for generating a bitstream including the encoded downmix signal and a spatial cue.
  • the first encoder outputs a downmix signal and a spatial cue by applying parametric coding to the first Lfe channel signal and the second Lfe channel signal according to an Lfe mode, and the spatial cue is a first Lfe channel signal or It may include a CLD (Channel Level Diffenece) output from the Lfe band of the second Lfe channel signal.
  • CLD Chip Level Diffenece
  • the encoder of the multichannel signal applies a time delay to the first Lfe channel signal included in the multichannel signal, and applies a time delay to the second Lfe channel signal included in the multichannel signal.
  • a second encoding unit encoding the first Lfe channel signal to which the time delay is applied and encoding the second Lfe channel signal to which the time delay is applied;
  • a bitstream formatter for generating a bitstream including the encoded first Lfe channel signal and the second Lfe channel signal.
  • the time delay may include a time delay generated during encoding of a general channel signal included in the multichannel signal.
  • An encoder of a multichannel signal includes a delay unit for applying a time delay to a general channel signal included in a multichannel signal; A first encoding unit encoding the general channel signal to which the time delay is applied; A second encoder for encoding an Lfe channel signal included in the multichannel signal and outputting a downmix signal and a spatial cue; And a third encoding unit encoding the encoded Lfe channel signal, wherein the time delay may include a time delay generated during the encoding of the Lfe channel signal.
  • the second encoder may output a downmix signal and a spatial cue by parametric coding the Lfe channel signal according to an Lfe mode.
  • a decoder of a multi-channel signal includes: a first decoding unit which decodes an encoding result extracted from a bitstream to generate a first downmix signal and a second downmix signal; A second decoding decoding the first downmix signal to output a first general channel signal and a first Lfe channel signal, and decoding the second downmix signal to output a second general channel signal and a second Lfe channel signal It may include wealth.
  • the second decoding unit applies a first spatial cue to parametric coding to output a first general channel signal and a first Lfe channel signal from a first downmix signal, and the second decoding unit may convert a second spatial cue into a parametric coding.
  • the second common channel signal and the second Lfe channel signal are output from the second downmix signal by applying to metric coding, and the first spatial cue and the second spatial cue are Lfe of the first Lfe channel signal or the second Lfe channel signal.
  • Channel Level Diffenece (CLD) output from the band may be included.
  • the decoder of the multi-channel signal decodes an encoding result extracted from a bitstream to generate a first downmix signal, and decodes another encoding result extracted from the bitstream to generate a second downmix signal.
  • a first decoding unit to generate;
  • a second decoding decoding the first downmix signal to output a first general channel signal and a first Lfe channel signal, and decoding the second downmix signal to output a second general channel signal and a second Lfe channel signal It may include wealth.
  • the second decoding unit outputs a first general channel signal and a first Lfe channel signal to the first downmix signal using parametric coding based on a first spatial cue, and the second decoding unit outputs the second down channel.
  • a second normal channel signal and a second Lfe channel signal are output to the mixed signal by using parametric coding based on a second spatial cue, wherein the first spatial cue and the second spatial cue are a first Lfe channel signal or a second Lfe channel signal. It may include a channel level difference (CLD) output from the Lfe band of the channel signal.
  • CLD channel level difference
  • a decoder of a multi-channel signal includes: a first decoding unit for decoding a result of encoding extracted from a bitstream to generate a downmix signal; And a second decoder configured to decode the downmix signal to output a first Lfe channel signal and a second Lfe channel signal.
  • the second decoding unit applies a parametric coding based on a spatial cue to the downmix signal to output a first Lfe channel signal and a second Lfe channel signal, and the spatial cue is a first Lfe channel signal or a second Lfe. It may include a channel level difference (CLD) output from the Lfe band of the channel signal.
  • CLD channel level difference
  • the decoder of the multi-channel signal decodes an encoding result extracted from the bitstream to output a first Lfe channel signal, and decodes another encoding result extracted from the bitstream to output a second Lfe channel signal.
  • a first decoding unit And a delay unit applying a time delay to the first Lfe channel signal and applying a time delay to the second Lfe channel signal.
  • the time delay may include a time delay generated in the decoding process of the general channel signal.
  • a decoder of a multichannel signal includes a first decoding unit decoding a general channel signal from a bitstream; A delay unit for applying a time delay to the decoded general channel signal; A second decoder to decode an Lfe channel signal from the bitstream; It may include a third decoding unit for decoding the decoded Lfe channel signal.
  • the time delay may include a time delay generated during the decoding of the Lfe channel signal.
  • the second decoding unit may output a downmix signal and a spatial cue by parametric coding the Lfe channel signal according to an Lfe mode.
  • a multi-channel signal to which synchronization is applied may be output by performing encoding / decoding in two steps or applying a time delay to encoding / decoding in one step.
  • FIG. 1 is a diagram illustrating an encoder and a decoder, according to an exemplary embodiment.
  • FIG. 2 is a diagram illustrating an encoder for encoding a multi-channel signal including an Lfe channel signal according to the first embodiment.
  • FIG. 3 is a diagram illustrating an encoder for encoding a multichannel signal including an Lfe channel signal according to the second embodiment.
  • FIG. 4 is a diagram illustrating an encoder for encoding a multichannel signal including an Lfe channel signal according to the third embodiment.
  • FIG. 5 illustrates an encoder for encoding a multichannel signal including an Lfe channel signal according to the fourth embodiment.
  • FIG. 6 illustrates a decoder for decoding the encoded result of FIG. 2.
  • FIG. 7 illustrates a decoder for decoding the encoded result of FIG. 3.
  • FIG. 8 is a diagram illustrating a decoder to decode the encoded result of FIG. 4.
  • FIG. 9 is a diagram illustrating a decoder for decoding the encoded result of FIG. 5.
  • FIG. 10 is a diagram illustrating a process of encoding a multi-channel signal using the encoder of FIG. 2.
  • FIG. 11 is a diagram illustrating a decoder for decoding the encoded result of FIG. 10.
  • FIG. 12 is a diagram illustrating a process of encoding a multichannel signal when sufficient encoding bits are shown in FIG. 10.
  • FIG. 13 is a diagram illustrating a decoder for decoding the encoded result of FIG. 12.
  • FIG. 14 illustrates an example of encoding a multi-channel signal using the encoder of FIG. 4.
  • FIG. 15 illustrates another example of encoding a multichannel signal using the encoder of FIG. 4.
  • FIG. 16 illustrates another example of encoding a multichannel signal using the encoder of FIG. 5.
  • 17 is a diagram illustrating another example of decoding a multichannel signal using the decoder of FIG. 9.
  • FIG. 18 is a diagram illustrating an encoder for encoding a multichannel signal when an Lfe channel signal is odd in a multichannel signal according to an embodiment.
  • FIG. 19 illustrates an encoder for encoding a general audio signal instead of an Lfe channel signal according to an embodiment.
  • FIG. 20 illustrates a decoder for decoding the encoded result of FIG. 19.
  • 21 is a diagram illustrating an encoding process and a decoding process, according to an embodiment.
  • FIG. 22 is a diagram illustrating a USAC encoder and a USAC decoder according to the first embodiment.
  • FIG. 23 is a diagram illustrating a USAC encoder and a USAC decoder according to a second embodiment.
  • FIG. 23 is a diagram illustrating a USAC encoder and a USAC decoder according to a second embodiment.
  • FIG. 1 is a diagram illustrating an encoder and a decoder, according to an exemplary embodiment.
  • the encoder 101 may generate a bitstream by encoding a multichannel signal including a plurality of channel signals.
  • the decoder 101 may then decode the multichannel signal from the bitstream received from the encoder 101 or stored in the medium at the encoder 101.
  • the multi-channel signal may include an Lfe channel signal.
  • the Lfe channel signal refers to a channel signal for selective limited low frequency effects (LFE).
  • LFE low frequency effects
  • the low range may mean a low frequency region up to 20-120 Hz.
  • the Lfe channel signal can be used to supplement the low band information of the main channel signal by carrying additional low band information.
  • FIG. 2 is a diagram illustrating an encoder for encoding a multi-channel signal including an Lfe channel signal according to the first embodiment.
  • FIGS. 2 through 5 illustrate a process of encoding a multi-channel signal including two Lfe channel signals
  • FIGS. 6 through 9 illustrate a process of decoding the encoding results of FIGS. 2 through 5.
  • the encoder may include a first encoding unit 201, a first encoding unit 202, a second encoding unit 203, and a bitstream formatter 204.
  • the first encoding unit 201 and the first encoding unit 202 may perform the same operation.
  • the first encoding unit 201 may generate the downmix signal dmx 1 using the Lfe channel signal Lfe 1 and the general channel signal x i .
  • the general channel signal may mean a channel signal that does not exhibit a low range effect.
  • the first encoding unit 202 may generate the downmix signal dmx 2 using the Lfe channel signal Lfe 2 and the general channel signal x i + 1 . i means the index of the normal channel signal. That is, the encoder of FIG. 2 may encode a multichannel signal in which a general channel signal and an Lfe channel signal are coupled.
  • the first encoding unit 201 and the first encoding unit 202 may output a spatial cue and a downmix signal by performing parametric coding.
  • the first encoding unit 201 and the first encoding unit 202 perform parametric coding using the Lfe channel signal.
  • a spatial cue CLD Choannel Level Difference
  • the spatial cue output through the parametric coding using the Lfe channel signal may output a relatively smaller amount of data than the spatial cue output through the parametric coding that is generally applied.
  • the spatial cues output from the first encoding unit 201 and the first encoding unit 202 are bit1 and bit2, respectively.
  • the second encoding unit 203 may encode using the downmix signal dmx 1 output from the first encoding unit 201 and the downmix signal dmx 2 output from the first encoding unit 202.
  • the downmix signal dmx 1 and the downmix signal dmx 2 may be input to the second encoding unit 203 as a stereo signal.
  • the second encoding unit 203 may be AAC, MP3, or the like.
  • the encoding result of the second encoding unit 203 is output as bit3, and bit3 is input to the bitstream formatter 204.
  • the bitstream formatter 204 can convert bit3 into a bitstream.
  • FIG. 3 is a diagram illustrating an encoder for encoding a multichannel signal including an Lfe channel signal according to the second embodiment.
  • the encoder of FIG. 3 may include a first encoding unit 301, a second encoding unit 302, a first encoding unit 303, a second encoding unit 304, and a bitstream formatter 305.
  • the first encoding unit 301 and the first encoding unit 303 may operate in the same manner as the first encoding unit 201 and the first encoding unit 202 of FIG. 2. That is, the first encoding unit 301 and the first encoding unit 303 may extract channel level difference (CLD), which is a spatial cue, in the Lfe band by performing parametric coding using the Lfe channel signal.
  • CLD channel level difference
  • the first encoding unit 301 may generate the downmix signal dmx 1 using the Lfe channel signal Lfe 1 and the general channel signal x i .
  • the first encoder 303 may generate the downmix signal dmx 2 using the Lfe channel signal Lfe 2 and the general channel signal x i + 1 .
  • the second encoder 302 may output bit3 using the downmix signal dmx 1 .
  • the downmix signal dmx 2 which is an encoding result of the first encoding unit 303 is input to the second encoding unit 302 as a mono signal.
  • the second encoding unit 304 may output bit4 by using the downmix signal dmx 2 .
  • FIG. 4 is a diagram illustrating an encoder for encoding a multichannel signal including an Lfe channel signal according to the third embodiment.
  • the encoder may include a first encoding unit 401, a second encoding unit 402, and a bitstream formatter 403.
  • the Lfe channel signals Lfe 1 and Lfe 2 may be coupled to each other and input to the first encoding unit 401.
  • the first encoding unit 401 may output the downmix signal dmx 3 , which is a mono signal, for the Lfe channel signals Lfe 1 and Lfe 2 .
  • bit1 means a spatial cue derived through parametric coding in the first encoding unit 401.
  • the downmix signal dmx 3 may be input to the second encoding unit 402.
  • the second encoding unit 402 may code the Lfe band in the downmix signal dmx 3 .
  • USAC Unified Speech And Audio Codec
  • AAC Advanced Audio Codec
  • Bit2 output from the second encoding unit 402 and bit1 output from the first encoding unit 401 may be output as a bitstream through the bitstream formatter 403.
  • FIG. 5 illustrates an encoder for encoding a multichannel signal including an Lfe channel signal according to the fourth embodiment.
  • the encoder may include a delay unit 501, a second encoding unit 502, a delay unit 503, a second encoding unit 504, and a bitstream formatter 505.
  • 5 illustrates a process of encoding an Lfe channel signal using the second encoding unit 502 and the second encoding unit 504 without passing through the first encoding unit described above.
  • the second encoder 502 and the second encoder 504 may perform parametric coding on the Lfe band.
  • the input signals for the second encoding unit 502 and the second encoding unit 504 need to be delayed corresponding to the case where the first encoding unit is present. If the general channel signals have two encoding processes and the Lfe channel signal has one encoding process, the normal channel signals have one more encoding process, which may cause a time delay due to the encoding process. Because there is. This time delay must be taken into account to generate a synchronized bitstream between the Lfe channel signal and the normal channel signal.
  • delay unit 501 and delay unit 503 are time delays that may occur when encoding is actually performed. ) Can be applied to the Lfe channel signal Lfe 1 and the Lfe channel signal Lfe 2 , respectively. Then, Lfe channel signal Lfe 1 (n- with time delay) ) And Lfe 2 (n- ) May be input to the second encoding unit 502 and the second encoding unit 504, respectively. Bits 1 and 2, which are encoding results of the second encoding unit 502 and the second encoding unit 504, may be output as bitstreams through the bitstream formatter 505, respectively.
  • FIG. 6 illustrates a decoder for decoding the encoded result of FIG. 2.
  • the decoder may include a bitstream formatter 601, a first decoding unit 602, a second decoding unit 603, and a second decoding unit 604.
  • FIG. 6 may operate in an inverse manner to FIG. 2.
  • the bitstream input to the bitstream formatter 601 may be a bitstream generated in FIG. 2.
  • the bitstream formatter 601 may output bit 1, bit 2, and bit 3 from the bitstream.
  • bit 1, bit 2 and bit 3 are the same as described in FIG.
  • bit3 may be input to the first decoding unit 602. Then, the first decoding unit 602 may generate the downmix signals dmx 1 and dmx 2 using bit3. Thereafter, the second decoding unit 603 may parametric code bit1, which is a spatial cue, and the downmix signal dmx 1 , and output the general channel signal x i and the Lfe channel signal Lfe 1 . Similarly, the second decoding unit 604 may output the general channel signal x i + 1 and the Lfe channel signal Lfe 2 by parametric coding the bit2 and the downmix signal dmx 2 which are spatial cues.
  • FIG. 7 illustrates a decoder for decoding the encoded result of FIG. 3.
  • the decoder includes a bitstream formatter 701, a first decoding unit 702, a second decoding unit 703, a first decoding unit 704, and a second decoding unit 705. can do.
  • FIG. 7 may operate in an inverse manner to FIG. 3.
  • the bitstream input to the bitstream formatter 701 may be a bitstream generated in FIG. 3.
  • the bitstream formatter 601 may output bit 1, bit 2, bit 3, and bit 4 from the bitstream.
  • bit 1, bit 2, bit 3, and bit 4 are the same as described in FIG.
  • bit3 may be input to the first decoding unit 702 and bit4 may be input to the first decoding unit 704. Then, the first decoding unit 702 may generate the downmix signal dmx 1 using bit3. The first decoder 704 may generate the downmix signal dmx 2 using bit4.
  • the second decoding unit 703 may output the general channel signal x i and the Lfe channel signal Lfe 1 by parametric coding bit1, which is a spatial cue, and the downmix signal dmx 1 .
  • the second decoding unit 604 may output the general channel signal x i + 1 and the Lfe channel signal Lfe 2 by parametric coding the bit2 and the downmix signal dmx 2 which are spatial cues.
  • FIG. 8 is a diagram illustrating a decoder to decode the encoded result of FIG. 4.
  • the decoder may include a bitstream formatter 801, a first decoding unit 802, and a second decoding unit 803.
  • FIG. 8 may operate in an inverse manner to FIG. 4.
  • the bitstream input to the bitstream formatter 801 may be a bitstream generated in FIG. 4.
  • the bitstream formatter 601 may output bit 1, bit 2, from the bitstream.
  • bit 1 and bit 2 are the same as described in FIG.
  • bit1 may be input to the first decoding unit 802, and bit2 may be input to the second decoding unit 803. Then, the first decoding unit 802 may generate the downmix signal dmx 3 using bit3.
  • the second decoding unit 803 may output Lfe channel signals Lfe 1 and Lfe 2 by parametric coding the spatial cue bit 2 and the downmix signal dmx 3 .
  • the first decoding unit 802 and the second decoding unit 803 may include the input downmix signal dmx 3 . Parametric coding can be performed for the Lfe band.
  • FIG. 9 is a diagram illustrating a decoder for decoding the encoded result of FIG. 5.
  • the decoder may include a bitstream formatter 901, a first decoding unit 902, a delay unit 903, a first decoding unit 904, and a delay unit 905.
  • FIG. 9 may operate in an inverse manner to FIG. 5.
  • the bitstream input to the bitstream formatter 901 may be a bitstream generated in FIG. 5.
  • the bitstream formatter 601 may output bit 1 and bit 2 from the bitstream. bit 1 and bit 2 are the same as described in FIG.
  • bit1 may be input to the first decoding unit 902 and bit2 may be input to the first decoding unit 904.
  • the first decoding unit 902 uses Lfe 1 as the Lfe channel signal (n ⁇ ) using bit1. ), And the second decoding unit 904 generates Lfe 2 (n ⁇ ), which is an Lfe channel signal using bit2. ) Can be created.
  • the delay unit 903 is Lfe 1 (n ⁇ ) which is an Lfe channel signal. Time delay for Lfe 1 (n- - ) Can be printed. Similarly, the delay unit 905 is a Lfe channel signal Lfe 2 (n- Time delay for Lfe 2 (n- - ) Can be printed.
  • FIG. 10 is a diagram illustrating a process of encoding a multi-channel signal using the encoder of FIG. 2.
  • FIG. 10 means an encoder for a multi-channel signal to which an encoder of Type 1 described in FIG. 2 is applied.
  • Two To One (TTO) 1001, 1002, 1004, and 1005 represented in FIG. 10 may encode an input signal according to a parametric coding scheme for a stereo signal of MPEG Surround. That is, the TTO may correspond to the first encoding unit described with reference to FIG. 2, and the USAC Encoder may correspond to the second encoding unit.
  • the TTO 1001 and the TTO 1002 perform parametric coding according to a normal mode
  • the TTO 1004 and TTO 1005 may perform parametric coding according to the Lfe mode.
  • the general channel signal (x i ) can be analyzed to extract the spatial cues, Channel Level Difference (CLD), Inter-Channel Coherence (ICC), and Interchannel Phase Difference (IPD). have.
  • CLD Channel Level Difference
  • ICC Inter-Channel Coherence
  • IPD Interchannel Phase Difference
  • the N multichannel signals may be parametrically encoded through TTO in one step and may be converted into M downmix signals dmx 1 to dmx M.
  • M downmix signals may be input in stereo form and encoded through USAC core coding.
  • the Lfe channel signals Lfe 1 and Lfe 2 may be coupled to the general channel signal and input to the TTO 1004 and the TTO 1005.
  • the general channel signal is downmixed by two channels, and the downmixed result may be stereo coded according to the USAC encoder.
  • two general channel signals x 2M-1 and x 2M among the general channel signals included in the multi-channel signal may be coupled to Lfe1 and Lfe2, which are Lfe channel signals, and input to TTO (Lfe).
  • FIG. 11 is a diagram illustrating a decoder for decoding the encoded result of FIG. 10.
  • FIG. 11 means a decoder for a multi-channel signal to which a type 1 decoder shown in FIG. 6 is applied.
  • One to two (OTT) 1103, 1104, 1106, and 1107 represented in FIG. 11 may decode an input signal according to a parametric coding scheme for a stereo signal of MPEG surround. That is, the OTT may correspond to the second decoding unit described with reference to FIG. 6, and the USAC decoder may correspond to the first decoding unit.
  • the OTT 1103 and the OTT 1104 may perform parametric coding according to the normal mode, and the OTT 1006 and the OTT 1107 may perform parametric coding according to the Lfe mode.
  • N multichannel audio signals may be output by being decoded in an encoded result.
  • M downmix signals may be output through the USAC decoder in one step as a result output through the bitstream.
  • M downmix signals may be input to the OTT in two steps to output stereo signals.
  • the OTT 1103 and the OTT 1104 may output two general channel signals, and the OTT 1006 and the OTT 1107 may output a result of combining the general channel signal and the Lfe channel signal.
  • FIG. 12 is a diagram illustrating a process of encoding a multichannel signal when sufficient encoding bits are shown in FIG. 10.
  • an encoding process may be performed as shown in FIG. 12. That is, general channel signals x 1 to x 2M-2 may be encoded by USAC Encoder 1203 and 1206.
  • the general channel signals x 1 to x 2M-2 are time delays when encoding is performed through the delay units 1201, 1201, 1204, and 1205. ) May be applied. The result with time delay applied can then be encoded by USAC Encoder 1203, 1206.
  • the time delay occurs at OTT 1207, 1208. It can be configured as time delay by QMF analysis, Hybrid Analysis and QMF synthesis. If the signal input to USAC Encoder 1209 is a QMF (Quadrature Mirror Filterbank) signal, When calculating, the time delay caused by QMF synthesis can be excluded.
  • QMF Quadrature Mirror Filterbank
  • FIG. 13 is a diagram illustrating a decoder for decoding the encoded result of FIG. 12.
  • FIG. 13 may be reversed from the process of FIG. 12.
  • the general channel signal may be decoded through the USAC decoders 1302 and 1305 and then output through the delay units 1303, 1304, 1306, and 1307.
  • the result obtained through the bitstream formatter 1301 is decoded by the USAC Decoder 1308 to generate a downmix signal.
  • the downmix signal is input to the OTTs 1309 and 1310, respectively, to provide a general channel signal x 2M.
  • the result of coupling -1 , x 2M and Lfe channel signals Lfe 1 and Lfe 2 can be output.
  • the time outputted through the USAC Decoders 1302 and 1305 is generated by one decoding process by the delay units 1303, 1304, 1306, and 1307.
  • Delay person Can be applied. here, Consists of QMF analysis, Hybrid Analysis, QMF synthesis and filtering delay, Is different from If the signal output from USAC Decoder (1302, 1305) is a QMF signal, The time delay incurred in the QMF analysis can be excluded when determining.
  • the filtering delay refers to a time delay caused by the filtering operation performed by the OTTs 1309 and 1310 regardless of the QMF conversion process.
  • the filtering delay may be a time delay occurring during a decorrelator operation performed by the OTTs 1309 and 1310.
  • FIG. 14 illustrates an example of encoding a multi-channel signal using the encoder of FIG. 4.
  • the type 3 encoder described in FIG. 4 may be used.
  • general channel signals x 1 to x 2M may be coupled to each other and input to the TTOs 1401 and 1402.
  • the TTOs 1401 and 1402 may parametric-code the general channel signals coupled by two to output downmix signals dmx 1 and dmx 2 together with spatial cues.
  • the output downmix signals dmx 1 and dmx 2 may be input to the USAC Encoder 1403 in a stereo form.
  • two Lfe channel signals Lfe 1 and Lfe 2 included in the multichannel signal may be coupled to each other and input to the TTO 1404.
  • the TTO 1404 may output a mono downmix signal dmx 3 by performing parametric coding using two Lfe channel signals Lfe 1 and Lfe 2 .
  • the USAC Encoder 1405 may encode according to the Lfe mode in the downmix signal dmx 3 .
  • FIG. 15 illustrates another example of encoding a multichannel signal using the encoder of FIG. 4.
  • an encoder of Type 3 described in FIG. 4 may be used.
  • the general channel signal is not parametrically encoded by the TTOs 1401 and 1402, but may be encoded by the USAC Encoders 1503 and 1506.
  • the delay units 1501, 1502, 1504, and the like are delayed by the time delay generated by the TTO 1507.
  • 1505 may apply a time delay to the normal channel signal.
  • the Lfe channel signals Lfe 1 and Lfe 2 are encoded according to the Lfe mode in the TTO 1507 and output as the downmix signal dmx 3 , and the downmix signal dmx 3 may be encoded by the USAC Encoder.
  • a general channel signal may be output from the bitstream derived from FIG. 14 via USAC decoder and OTT.
  • Lfe channel signals Lfe 1 and Lfe 2 may be output from the bitstream derived from FIG. 14 via USAC decoder and OTT.
  • a general channel signal may be output from the bitstream derived from FIG. 15 via a USAC decoder and a delay unit.
  • the Lfe channel signals Lfe 1 and Lfe 2 may be output from the bitstream derived from FIG. 15 via USAC decoder and OTT.
  • FIG. 16 illustrates another example of encoding a multichannel signal using the encoder of FIG. 5.
  • FIG. 16 an encoder for a multichannel signal to which an encoder of Type 4 of FIG. 5 is applied is shown.
  • the general channel signals may be converted into downmix signals through the TTOs 1601 and 1602, and the converted downmix signals may be output as bitstreams through the USAC Encoder 1603.
  • the Lfe channel signals are delayed by the time delays generated by the TTOs 1601 and 1602 through the delay units 1604 and 1606. ) And the time delay applied result may be encoded according to Lfe mode by USAC Encoder 1605 and 1607, respectively. That is, the Lfe channel signal undergoes one encoding process, unlike the general channel signal which undergoes two-step encoding. Therefore, the time delay caused by the encoding performed by the TTO. It needs to be applied to this generic channel.
  • 17 is a diagram illustrating another example of decoding a multichannel signal using the decoder of FIG. 9.
  • FIG. 17 illustrates a result of applying the type 4 decoder of FIG. 9.
  • a general channel signal may be output through the USAC Decoder 1702 and the TTO 1703.
  • the Lfe channel signal may be output through the USAC decoders 1705 and 1707 and the delay units 1706 and 1708.
  • the Lfe channel signal since only one step of decoding is performed, a time delay generated during decoding of the TTOs 1703 and 1704 is performed. Needs to be applied through delay units 1706 and 1708. Thus, the Lfe channel signal can be synchronized with the normal channel signal output through the decoder.
  • FIG. 18 is a diagram illustrating an encoder for encoding a multichannel signal when an Lfe channel signal is odd in a multichannel signal according to an embodiment.
  • FIG. 18 illustrates the case where the Lfe channel signal is odd.
  • one Lfe channel signal Lfe 2n + 1 is input to the delay unit 1801 to delay time. This can be applied.
  • the Lfe channel signal to which the time delay is applied is encoded according to the Lfe mode through the second encoding unit 1802, so that bit1 may be output.
  • the Lfe channel signal may be processed through an encoder indicating Type 4 of FIG. 5 or a decoder indicating Type 4 of FIG. 9.
  • the Lfe channel signal is generated by the first encoding unit for synchronization with the general channel signal.
  • the time delay needs to be applied through the delay unit 1801.
  • FIG. 19 illustrates an encoder for encoding a general audio signal instead of an Lfe channel signal according to an embodiment.
  • parametric coding may be applied to the general channel signals x 1 and x 2 through the first encoding unit 1901 and converted into a downmix signal dmx 1 together with the spatial cue bit 1.
  • the general channel signals x 3 and x 4 may be converted into a downmix signal dmx 2 with spatial cue bit 2 by applying parametric coding through the first encoding unit 1902.
  • bit3 may be converted into a bitstream by the bitstream formatter 1904.
  • FIG. 20 illustrates a decoder for decoding the encoded result of FIG. 19.
  • bits 1 and bit 2 which are spatial cues, and encoded bit 3 may be output by the bitstream formatter 2001.
  • the first decoder 2002 may decode bit3 to output downmix signals dmx 1 and dmx 2 .
  • the second decoder 2003 may decode the downmix signal dmx 1 to output general channel signals x 1 and x 2 .
  • the second decoding unit 2004 may output the normal channel signals x 1 and x 2 by decoding the downmix signal dmx 2 .
  • 21 is a diagram illustrating an encoding process and a decoding process, according to an embodiment.
  • the first encoding unit described above may correspond to the TTOs 2101 and 2102 in FIG. 21, and the second encoding unit may correspond to the USAC Encoder 2103 in FIG. 21. Meanwhile, the first decoding unit described above may correspond to the USAC decoder 2104, and the second decoding unit may correspond to the OTTs 2105 and 2106.
  • the results of (i) four general channel signals or (ii) one general channel signal and one Lfe channel signal may be input to the TTOs 2101 and 2102. Then, the TTOs 2101 and 2102 may generate the downmix signal together with the spatial cues through parametric coding. USAC Encoder 2103 may encode the downmix signal.
  • USAC Decoder 2104 can output two downmix signals from the bitstream.
  • the OTTs 2105 and 2106 may output (i) four general channel signals or (ii) one general channel signal and one Lfe channel signal from the downmix signal.
  • FIG. 22 is a diagram illustrating a USAC encoder and a USAC decoder according to the first embodiment.
  • USAC Encoder is configured separately from the TTO or the USAC Encoder is configured separately from the OTT.
  • the USAC Encoder may be implemented as an extended USAC Encoder 2201 including the TTOs 2203 and 2204.
  • USAC Decoder may be implemented with an extended USAC Decoder 2202 including OTTs 2211 and 2212.
  • (i) four general channel signals or (ii) one general channel signal and one Lfe channel signals may be parametric coded by the TTOs 2203 and 2204 and output as a downmix signal.
  • the downmix signal output from the TTOs 2203 and 2204 may be parametric coded once more by being input to the TTO 2205 in stereo form.
  • the parametric coded result is frequency extended by the SBR 2206 and can be encoded by the Core Encoder 2207 for the unbanded core band.
  • bitstream generated by the extended USAC Encoder 2201 is decoded by the Core Decoder 2208, which is not extended by the core band, and the decoded result is input by the SBR 2209 to be extended by the original frequency. Can be restored. Then, the result of the frequency extension by the SBR 2209 is parametric coded by the OTT 2210 to generate two downmix signals, and the generated downmix signal is parametric coded by the OTTs 2211 and 2212. It can be output as (i) four general channel signals or (ii) one general channel signal and one Lfe channel signals.
  • FIG. 23 is a diagram illustrating a USAC encoder and a USAC decoder according to a second embodiment.
  • FIG. 23 is a diagram illustrating a USAC encoder and a USAC decoder according to a second embodiment.
  • FIG. 23 illustrates that the positions of the SBR 2305 and the TTO 2306 are changed in the expanded USAC Encoder 2301 and the positions of the OTT 2309 and the SBR 2310 are extended in the extended USAC Decoder 2302. You can see the change.
  • the remaining components may be applied in the same manner as described with reference to FIG. 22.
  • the apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components.
  • the devices and components described in the embodiments may be, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions.
  • the processing device may execute an operating system (OS) and one or more software applications running on the operating system.
  • the processing device may also access, store, manipulate, process, and generate data in response to the execution of the software.
  • OS operating system
  • the processing device may also access, store, manipulate, process, and generate data in response to the execution of the software.
  • processing device includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include.
  • the processing device may include a plurality of processors or one processor and one controller.
  • other processing configurations are possible, such as parallel processors.
  • the software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device.
  • Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted.
  • the software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner.
  • Software and data may be stored on one or more computer readable recording media.
  • the method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • the program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

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Abstract

L'invention concerne un codeur et un procédé de codage pour un signal multicanal, ainsi qu'un décodeur et un procédé de décodage pour un signal multicanal. L'invention permet de coder un signal de canal général et un signal de canal Lfe inclus dans un signal multicanal au moyen d'un processus de codage en deux étapes ou d'un processus de codage en une étape auquel est appliqué un délai, de façon à coder efficacement le signal multicanal.
PCT/KR2014/006406 2013-07-15 2014-07-15 Codeur et procédé de codage pour signal multicanal, ainsi que décodeur et procédé de décodage pour signal multicanal. Ceased WO2015009040A1 (fr)

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EP14826617.4A EP3023984A4 (fr) 2013-07-15 2014-07-15 Codeur et procédé de codage pour signal multicanal, ainsi que décodeur et procédé de décodage pour signal multicanal.

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KR20130083073 2013-07-15
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KR20130123416 2013-10-16
KR10-2014-0089269 2014-07-15
KR20140089269A KR20150009474A (ko) 2013-07-15 2014-07-15 다채널 신호를 위한 인코더 및 인코딩 방법, 다채널 신호를 위한 디코더 및 디코딩 방법

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