CN1622694A - Method and equipment for playing multichannel digital sound - Google Patents

Abstract

The invention discloses a method and an device for playing multichannel digital sound. A user can enjoy multichannel digital sound which is calibrated to be properly matched with a position of the user. The device includes a sound signal generation unit for generating a digital sound signal from a multichannel sound source data, and a channel calibration unit for storing a channel calibration matix set by a control signal generated based on user position information, the stored matix is used to calibrate the multichannel digital sound signal and carry the calibrated sound signal to a plurality of speakers. The method for playing the multichannel digital sound comprises generating the multichannel sound signal from the multichannel sound source data, setting the channel calibration matix based on the user position information inputted by the user, and using the set matix to calibrate the multichannel digital sound signal, then carrying the calibrated multichannel sound signal to the plurality of speakers.

Description

Method and device for playing multi-channel digital sound

Technical field

The present invention relates to a method and apparatus for playing multi-channel digital sound, and more particularly, to a method and apparatus for playing multi-channel digital sound that can change characteristics of a speaker based on a user's position.

Background technique

Recently, home theater systems have become popular. Home theater systems include television and video equipment designed to reproduce in the home what is then seen in a movie theater. The term "home theater" was used even before digital versatile disk (DVD) players became common, but it has become popular when DVD players have become more common. DVD players provide users with more ambient sound than traditional audio systems such as Laser Disc (LD) players, Video Home Systems (VHS), and Video Compact Disc (VCD) players. For example, when the scene from the movie "Saving Private Ryan, 1998" in which bullets are fired forward is played on the screen, the sound of the bullets being fired actually comes from the rear speakers to the front speakers. Also, when a helicopter flies over the actors in the movie "Matrix", the moviegoer feels like a helicopter is flying above. This stereo sound is achieved by a multi-channel digital sound system. Nowadays, multi-channel sound systems such as 5.1-channel or 6-channel digital sound systems are popular.

A 5.1-channel system typically consists of five discrete full-frequency-range main channels (left/right front, center, and left/right rear) plus an optional limited Wideband Low Frequency Effects (LEF) channel (0.1 channel). The main channel located in front of the user refers to the left/right front speakers. This main speaker mainly reproduces background music and effect sounds. In addition, the main speaker is larger in size than the other speakers because it facilitates stereo sound playback, but it is not necessarily larger than the other speakers. The center channel refers to the center speaker and reproduces vocal sounds such as dialogue in movies and singing in music but often includes a small amount of sound effects. The center speaker is usually located at the top of the TV so that the viewer perceives the sound as coming from the actors on the TV screen. The left/right rear channels are called rear speakers or surround speakers and are placed behind the user's left or right rear. The rear speakers are responsible for the surround effect. This surround was mono sound in the past but stereo surround is currently used for 5.1 channel systems. On the other hand, since low frequencies are more non-directional than high frequencies, the subwoofer carrying the low frequency bass is free to place. Ordinary subwoofers can reproduce bass at 20 to 30Hz but high-performance subwoofers can reproduce bass below 20Hz. It can create an ambient sound effect because the low frequencies add coverage to the sound. Subwoofers are classified into ordinary subwoofers and active subwoofers with their own amplifiers, and now active subwoofers are widely used due to dynamic sound and volume control functions. Speakers other than the subwoofer are not physically distinct from each other, but rather are divided by their placement. However, the center speaker can be slightly different from the other speakers to carry dialogue.

In addition to the 5.1-channel system, there are other kinds of multi-channel digital sound playback systems such as 4-channel, 4.1-channel, and 6.1-channel systems. In order to install a home theater system having a multi-channel digital sound playback function, speakers must be respectively connected to corresponding audio signal output terminals provided on the home theater system.

1A and 1B respectively show a layout diagram of an output terminal of a 5.1-channel home theater system and placement of speakers.

Each speaker has its own input terminal for connection to a corresponding output terminal of the sound playback device. That is, the left front speaker should be connected to the left front channel output terminal and the center speaker should be connected to the center channel output terminal. The speakers should also be placed in the correct location. The left front speaker should be placed on the user's front left and the right front speaker should be placed on the user's front right. The left rear speaker should be placed at the user's rear left and the right rear speaker should be placed at the user's rear right. The center speaker can be placed on the top or bottom of the screen display of the home theater system which can be placed in front of the user. Because the subwoofer is more non-directional than other speakers, it can be placed in any direction. After the speakers are installed, users can enjoy 5.1-channel stereo sound.

However, if the user moves the home theater system's screen for any reason, all speakers should be rearranged. That is, even if the main speaker is not moved for convenience reasons, the connection between the main speaker and the channel output terminal of the sound playback device should be changed. At this point, the placement or connection of the subwoofer does not have to be rearranged since it has no direction. If a user watches a movie in a home theater system without rearranging the connections between the main speakers and the output terminals on the sound playback device, the sound effects will not match the dialogue and direction of the sound. In addition, even when the user only enjoys music instead of movies, it is inconvenient that the user should listen to music at a predetermined location. Therefore, there is a need for a multi-channel digital sound playback method and device in which users can enjoy music and movies at any location.

Contents of Invention

In order to solve the above-mentioned problems, the present invention provides a multi-channel digital sound playback method capable of calibrating speaker channels to match a user's position and an apparatus for implementing the method.

According to one aspect of the present invention, there is provided a multi-channel digital sound playback device, the device comprising: a sound signal generating unit for generating a multi-channel sound signal from multi-channel sound resource data; a channel calibration unit for for storing a channel calibration matrix set by a control signal according to user's position information, calibrating a multi-channel sound signal using the calibration matrix, and carrying the calibrated sound to a speaker.

The user's location information is preferably input by the user through the user interface means and may include a direction the user wishes to face when listening to music and the direction includes front, back, left and right.

According to another aspect of the present invention, a method for a multi-channel digital sound playback device is provided, the method comprising: setting a channel calibration matrix based on the user's position information input by the user and using the set matrix to calibrate the multi-channel After the sound signal, a multi-channel sound signal is generated from the multi-channel sound resource data; and the calibrated multi-channel sound signal is carried to a plurality of speakers.

When carrying the calibrated multi-channel sound signal, the location information of the user is preferably input via the user interface means. The user's location information includes a direction that the user wants to face when listening to music and the directions include front, back, left, and right.

According to another aspect of the present invention, there is provided a multi-channel digital sound calibration device, which includes: an input unit for receiving a multi-channel digital sound signal; The control signal of the message sets a channel calibration matrix based on which the multi-channel sound signal is calibrated and the calibrated sound signal is transmitted to the speakers.

Here, the user's location information is preferably input through the user interface device, and the user's location information may include a direction that the user wants to face when listening to music and the direction includes front, back, left and right.

Description of drawings

The above objects and advantages of the present invention will become more apparent by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings, wherein:

FIG. 1A shows a layout of output terminals of a 5.1-channel home theater system and FIG. 1B shows a layout of placement of speakers of a 5.1-channel home theater system;

Fig. 2 is a functional block diagram of a multi-channel home theater system according to the present invention;

FIG. 3 is a flowchart showing a method of calibrating a sound channel when a user's position changes according to one embodiment of the present invention;

4 is a flowchart illustrating a method of calibrating a sound channel when a user's position changes according to another embodiment of the present invention; and

5A to 5D respectively illustrate screens of a home theater system displaying channels calibrated differently based on a user's position.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 2 is a block diagram of a multi-channel digital sound playback device according to the present invention.

Referring to Fig. 2, the multi-channel digital sound playback device comprises a sound signal generating unit 30; a controller 20, which is used to receive commands input by the user through the user interface device 10 and control all parts of the playback device; a channel calibration unit 40, used to The speaker channels are calibrated in response to control signals generated from the controller 20; the display unit 50 is used to display the layout of the channels and the plurality of speakers. Here, the term "multi-channel digital sound" means generated sound signals reproduced by at least three speakers and the term "sound resource data" means digital sound data.

The sound signal generating unit 30 generates a multi-channel sound signal using the multi-channel sound resource data. Since the device shown in FIG. 2 is a 5.1-channel digital sound playback device, the sound signal generation unit 30 uses 5.1 multi-channel sound resource data to generate left front speakers, right front speakers, center speakers, left rear speakers, Acoustic signals from the right rear speaker and subwoofer. The generated sound signal is sent to the channel calibration unit 40 .

The channel calibration unit 40 receives the multi-channel sound signal and carries the received signal to each speaker through a preset calibration matrix. The matrix set in response to the control signal generated by the controller 20 will be described in detail later.

The controller 20 controls each component of the multi-channel digital sound playback device and generates control signals in response to control commands input by the user through the user interface device 10. The controller 20 makes the device output sound matching the user's position by adjusting the channel calibration matrix set by the channel calibration unit 40 after receiving the user position information from the user interface device 10 .

The user interface device 10 transmits control commands input by the user to the controller 20 . The user interface device 10 may be implemented as a remote control device, an On Screen Display (OSD) using touch screen technology, or control buttons provided on a multi-channel digital sound playback device. The user can use the user interface device 10 to adjust the volume level, use the equalizer function and implement record and playback commands.

In addition, the user can change the channel calibration matrix by inputting his or her location information through the user interface device 10 to change the channel and characteristics of the speaker.

When the user controls the multi-channel digital sound playback device, the display unit 50 displays the control status of the channel calibration. The display unit 50 may be a monitor, a screen, or a dot matrix device including light emitting diodes. When the user uses the OSD as the user interface device 10, the additional display unit can be omitted.

A plurality of speakers that receive channel sound signals and output channel sound are usually connected to a multi-channel digital sound playback device. Loudspeakers are usually connected to the device by cables or wires, but in the near future they may also be connected without cables.

The multi-channel digital sound playback device can be realized by including a sound signal generating unit that generates multi-channel sound resource data. However, the sound signal generating unit may be replaced by a sound signal input unit that receives a multi-channel sound signal played by a conventional multi-channel digital sound playback device. That is, the multi-channel digital sound playback unit and the channel calibration unit can be realized independently.

The channel calibration unit 40 will be described in detail below. Throughout the description of the present application, the term "channel" may be interpreted as a sound resource for a particular channel. Referring to FIG. 1A , a left front speaker, a right front speaker, a left rear speaker, a right rear speaker, a center speaker, and a subwoofer carry different sound resources. If the sound resources for the left front speaker, right front speaker, left rear speaker, right rear speaker, center speaker, and subwoofer are called channel 1, channel 2, channel 3, channel 4. Channel 5 and channel 6, and the left front speaker, right front speaker, left rear speaker, right rear speaker, center speaker and subwoofer are respectively called speaker 1, speaker 2, speaker 3, Speaker 4, Speaker 5, and Speaker 6, the sound signal delivered to the speaker is defined as:

[expression1]

In the formula, C1, C2, C3, C4, C5 and C6 represent the sound signals carried from the sound channel 1, the sound channel 2, the sound channel 3, the sound channel 4, the sound channel 5 and the sound channel 6 respectively, and S1, S2, S3, S4, S5, and S6 denote the sound signals transmitted to speaker 1, speaker 2, speaker 3, speaker 4, speaker 5, and speaker 6, respectively. The values of cells H11 to H66 in the matrix vary according to the user's position. According to the user's position, the values of the elements H11 to H66 are changed so that the speaker outputs sound appropriately matching the user's position. On the other hand, the sound signal carried by the loudspeaker in a conventional multi-channel digital sound playback device is defined as:

[expression2]

In the formula, n represents the serial number of the channel, and C1, C2, C3, ..., Cn-1, and Cn represent channels from channel 1, channel 2, channel 3, ..., channel n-1 and is the sound signal of the sound resource of channel n, and S1, S2, S3, ..., Sn-1, and Sn denote the sound signals transmitted to speaker 1, speaker 2, speaker 3, ..., speaker n-1, and speaker n, respectively sound signal. Meanwhile, a matrix having cells H11 to Hnn is a channel calibration matrix, and values of cells H11 to Hnn vary according to a user's position.

The channel calibration matrix set by the channel calibration unit 40 is passed through an adder, a multiplier, a multiplexer, and a demultiplexer.

The following is a method for setting a channel calibration matrix according to a user's location with reference to FIGS. 3 and 4 .

FIG. 3 is a flowchart illustrating a method of calibrating a sound channel when a user's position changes according to one embodiment of the present invention.

First, the user inputs location information of the user using the user interface device at step s10. The location information of the user includes the location where the user is located and the direction the user is facing. Most simplified position information consists of directions relative to the user of the multi-channel digital sound playback device, namely left, right, front and rear. According to the present invention, a user can listen to stereo music at any position by adjusting each sound output from a speaker based on the user's position information. The easiest way to set the channel calibration matrix of a multi-channel digital sound playback device is to have the user input his or her positional information using the user interface means. Such input processing steps may be omitted if methods for automatically tracking users are developed.

After the user's location information is input, the multi-channel digital sound playback device compares the previously set user's location information with the newly input user's location information at step s20. If the previously set information is different from the newly input information, the channel calibration matrix is updated in step s30. Second, it is determined whether the user's location information is accurately set by testing the speaker at step s40. If the previously set position information is the same as the newly input information, the speaker is tested without updating the channel calibration matrix at step s30. The speaker tests the sound, which then produces a voice message. For example, if speaker 1 is set as the front left speaker, the message "This is the front left speaker" is generated on speaker 1.

As a result of the speaker test, if all the speakers are properly set, the user's position information input process ends. Otherwise, in step s50, the user's location information input process is repeated through steps s10 to s40 again.

FIG. 4 is a flowchart illustrating a method of calibrating a sound channel when a user's position changes according to another embodiment of the present invention.

First, the user inputs location information of the user through the user interface device at step s110. The location information of the user input by the user may be input in the same method as step s10 described in FIG. 3 . If the user's location information is input, the device compares the previously set user's location information with the newly input location information at step s120. If the previously set position is different from the newly input information, update the channel calibration matrix of the channel calibration unit at step s130. Next, it is determined whether the user's location information is properly set by testing the speaker at step s140. If the previous setting information is the same as the new input information, the speaker is tested without updating the channel calibration matrix at step s130. By testing the speaker, the user confirms whether the user accurately inputs the user's location information. If the user's location information is accurately input, the speaker is tuned in step s160. However, if the user's location information is not accurately input, the user's location information is input again at step s150.

Even if the channel is calibrated to match the user's position, since the sound reproduced by the speaker varies depending on the structure of the house where the playback device is installed and the type of furniture in the house, a speaker tuning step, step s160, is required. The user can also fine-tune the sound channels to match his or her preferences through the speaker tuning steps. Loudspeaker tuning is done by adjusting the volume of each loudspeaker or by changing the value of a parameter in the channel calibration matrix taking into account the effect of direction.

A method for inputting location information of a user and a transmitted sound signal value to a speaker is described with reference to FIGS. 5A to 5D .

5A to 5D illustrate channel calibration status displayed on an on-screen display (OSD).

Referring to FIG. 5A, when a user faces a multi-channel digital sound playback device, he or she wishes to listen to music. As shown in FIG. 5A , the user faces a multi-channel digital sound playback device, and the user's location information is default information. If the user sets the direction "front" as the user's position information through the window screen display system device (OSD), the channel calibration matrix is defined as:

[expression 3]

Here, when the multi-channel digital sound playback device is installed in the initial stage, the values of the cells in the channel calibration matrix may be previously set or newly input as expressed by Expressions 3 to 6.

The speakers carry the sound output from the speaker output terminal on the corresponding playback device. Speaker 1 is set as front left speaker, speaker 2 is set as front right speaker, speaker 3 is set as rear left speaker, speaker 4 is set as rear right speaker, speaker 5 is set as center speaker and speaker 6 is set as subwoofer speaker.

Referring to FIG. 5B, the user makes his or her back face the multi-channel digital sound playback device. In this case, each speaker performs a different function from the other speaker unlike in the case where the user faces the multi-channel digital sound playback device. Here, the channel calibration matrix is set to:

[expression 4]

That is, speaker 4 becomes the front left speaker, speaker 3 becomes the front right speaker, speaker 2 becomes the rear left speaker, speaker 1 becomes the rear right speaker, and speaker 6 becomes the subwoofer. Here, speaker 3 and speaker 4 function as center speakers responsible for carrying dialogue or speech. In other words, speaker 4 carries the sound of the left front speaker channel and also some of the center speaker channel sound, and speaker 3 carries the right front speaker channel sound and some of the center speaker channel sound. The proportion of the channel sound of the center speaker carried by the speaker 3 and the speaker 4 is determined by the value "a" in Expression 4. The speaker 3 and the speaker 4 reproduce dialogue or speech because it is unnatural for the speech to come from behind the user. However, the speakers may be arranged in such a way that the actual center speaker speaker 5 performs its own function, namely carrying dialogue or speech.

Referring to FIG. 5C, when the user faces the right side of the multi-channel digital sound playback device, he or she wishes to listen to music. At this time, as in the case where the user faces his or her back to the multi-channel digital sound playback device, the respective speakers perform functions different from those in the case where the user faces the multi-channel digital sound playback device . Here, the channel calibration matrix is expressed as:

[expression 5]

Speaker 2 becomes the left front speaker, speaker 4 becomes the right front speaker, speaker 1 becomes the left rear speaker, speaker 3 becomes the right rear speaker and speaker 6 becomes the subwoofer. At this point, speaker 2 and speaker 4 carry the dialogue sound normally carried by the center speaker. The ratio of the dialogue sound transmitted to the speaker 2 and the speaker 4 is determined by the value "b" of the cell in the matrix expressed in Expression 5.

Referring to FIG. 5D , when the user faces the left side of the multi-channel digital sound playback device, he or she wishes to listen to music. At this time, as in the case where the user faces his or her back to the multi-channel digital sound playback device, the respective speakers perform functions different from those in the case where the user faces the multi-channel digital sound playback device , and the channel calibration matrix is expressed as:

[expression 6]

As shown in the above expressions, speaker 3 functions as the front left speaker, speaker 1 functions as the front right speaker, speaker 4 functions as the rear left speaker, speaker 2 functions as the rear right speaker, and speaker 6 functions as the rear right speaker. Plays the role of a subwoofer. Speaker 1 and Speaker 3 partially function as center speakers that carry dialogue sound. The proportion of the dialogue sound carried by Speaker 1 and Speaker 3 is determined by the value "c" of the cell in Expression 6.

The speaker tuning shown in Fig. 4 is done by adjusting the parameter values in the channel calibration matrix expressed by the above expressions. For example, one of the values "a", "b" and "c" of cells in the matrix may be increased or decreased. Additionally, the value "1" in the channel calibration matrix may be weighted. In addition, the wording "the sound signal is being transmitted to the speaker" means that the speaker is connected to the output terminal of the multi-channel digital sound playback device through a cable and transmits the sound signal to the speaker through the corresponding output terminal and the cable. The transmitted electrical sound signal is output through a loudspeaker that emits sound in the air.

In the case of using the channel calibration matrix, the M-channel sound resource can be changed into an N-channel sound resource, where N is smaller than M. That is, 5.1-channel sound can be changed to 2-channel stereo sound. At this point, the speaker can be calibrated defined as:

[expression 7]

Where S1 and S2 represent the signals sent to the left and right speakers of the stereo sound system, respectively. The sound signal generated by amplifying the signals of the left front, left rear, center and subwoofer speakers by an appropriate parameter value of the 5.1 channel is transmitted to the left speaker of the stereo sound system. The sound signal generated by amplifying the signals of the right front, right rear, center and subwoofer speakers by an appropriate parameter value of the 5.1 channel is transmitted to the right speaker of the stereo sound system. By adjusting the values of the cells in the channel calibration matrix, the user can listen to music that matches the user's position and the sound with a large number of channels can be changed to a sound with a small number of channels.

Including the detailed description, those skilled in the art will appreciate that changes and modifications can be made in the preferred embodiment without materially departing from the principles of the invention. Although the 5.1-channel digital sound playback device has been described in the above embodiments of the present invention, the present invention should not be limited thereto. According to the present invention, the calibration channel of the speaker is variably calibrated based on the position information of the user, so that the present invention can be applied to 4.1-channel, 6.1-channel or other multi-channel digital sound playback devices. Therefore, the disclosed preferred embodiments of the present invention are presented in a general and descriptive sense only and not for purposes of limitation. Accordingly, the scope of the invention is determined by the appended claims rather than the foregoing description, and all changes and equivalents which come within the scope of the claims are intended to be embraced therein.

According to the present invention, the user can easily change the characteristics of the speakers of the multi-channel digital sound playback device based on the position where the user wishes to listen to music. That is, the user can simply modify the characteristics of the speaker using the user interface device without actually moving the speaker.

Claims (30)

1, a kind of multichannel digital sound playback apparatus comprises:

The voice signal generation unit is used for producing digital audio signal from the multi-channel sound resource data; With

The sound channel alignment unit is used to store the sound channel calibration matrix that is provided with by the control signal that produces according to user position information, use the matrix calibration multi-channel sound signal of this storage, and the voice signal of transmission calibration is to a plurality of loud speakers.

2, multichannel digital sound playback apparatus according to claim 1, wherein, user position information is imported by user's interface device by the user.

3, multichannel digital sound playback apparatus according to claim 2, wherein, user position information comprises that the user wishes that direction and this direction faced comprise forward and backward a, left side and right when listening to the music.

4, multichannel digital sound playback apparatus according to claim 2, wherein, user's interface device is same panel type display (OSD).

5, multichannel digital sound playback apparatus according to claim 1, wherein, the sound channel calibration matrix calibration that voice signal is expressed by expression formula:

N represents the sequence number of sound channel in the formula, and C1 to Cn represents the multi-channel sound signal respectively, and S1 to Sn represents to be sent to the voice signal of loud speaker 1 to the calibration of loud speaker n respectively, and H11 to Hnn is illustrated in the value of unit in the sound channel calibration matrix.

6, multichannel digital sound playback apparatus according to claim 5, wherein, the multi-channel sound signal is 5.1 channel sound signals (n=6).

7, multichannel digital sound playback apparatus according to claim 6, wherein, if the user in the face of the direction of multichannel digital sound playback apparatus, then Jiao Zhun voice signal is calculated by following formula:

C1 is the left front channel sound signal of putting in the formula, C2 is the right front channel sound signal of putting, C3 is the left back channel sound signal of putting, C4 is the right back channel sound signal of putting, C5 is the center channels voice signal, C6 is the subwoofer channel sound signal, S1 is the left front channel sound signal of putting of calibration, S2 is the right front channel sound signal of putting of calibration, S3 is the left back channel sound signal of putting of calibration, S4 is the right back channel sound signal of putting of calibration, and S5 is that the center channels voice signal and the S6 of calibration is the subwoofer channel sound signal of calibration.

8, multichannel digital sound playback apparatus according to claim 6, wherein, if the user in the direction that makes his or his back in the face of the multichannel digital sound playback apparatus, then Jiao Zhun voice signal is calculated by following formula:

The value of the component of " a " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

9, multichannel digital sound playback apparatus according to claim 6, wherein, user position information comprises the direction of indicating the right side, the voice signal of calibration is calculated by following formula:

The value of the component of " b " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

10, multichannel digital sound playback apparatus according to claim 6, wherein, user position information comprises the direction in indication left side, the voice signal of calibration is calculated by following formula:

" c " the value of the component of the right front center channels voice signal of putting channel sound signal that is that be contained in calibration left front put channel sound signal and calibration in the formula.

11, a kind of multichannel digital sound back method comprises:

Produce the multi-channel sound signal from the multi-channel sound resource data; With

After based on the user position information by user's input the sound channel calibration matrix being set and using the matrix calibration multi-channel sound signal of this setting, the multi-channel sound signal that carries calibration is to a plurality of loud speakers.

12, multichannel digital sound back method according to claim 11, wherein, user position information is by importing by user's interface device when carrying the multi-channel sound signal of calibration.

13, multichannel digital sound back method according to claim 12, wherein, user position information comprises that the user wishes that direction and this direction faced comprise forward and backward a, left side and right when listening to the music.

14, multichannel digital sound back method according to claim 12, wherein, user's interface device is same panel type display (OSD).

15, multichannel digital sound back method according to claim 11, wherein, the sound channel calibration matrix calibration that voice signal is expressed by following formula:

N represents the sequence number of sound channel in the formula, and C1 to Cn represents the multi-channel sound signal respectively, and S1 to Sn represents to be sent to the voice signal of loud speaker 1 to the calibration of loud speaker n respectively, and H11 to Hnn is illustrated in the value of unit in the sound channel calibration matrix.

16, multichannel digital sound back method according to claim 15, wherein, the multi-channel sound signal is 5.1 channel sound signals (n=6).

17, multichannel digital sound back method according to claim 16, wherein, if the user in the face of the direction of multichannel digital sound playback apparatus, then Jiao Zhun voice signal is calculated by following formula:

C1 is the left front channel sound signal of putting in the formula, C2 is the right front channel sound signal of putting, C3 is the left back channel sound signal of putting, C4 is the right back channel sound signal of putting, C5 is the center channels voice signal, C6 is the subwoofer channel sound signal, S1 is the left front channel sound signal of putting of calibration, S2 is the right front channel sound signal of putting of calibration, S3 is the left back channel sound signal of putting of calibration, S4 is the right back channel sound signal of putting of calibration, and S5 is the center channels voice signal of calibration, and S6 is the subwoofer channel sound signal of calibration.

18, multichannel digital sound back method according to claim 16, wherein, if the user in the direction that makes his or his back towards the multichannel digital sound playback apparatus, then Jiao Zhun voice signal is calculated by following formula:

The value of the component of " a " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

19, multichannel digital sound back method according to claim 16, wherein, user position information comprises the direction of indicating the right side, the voice signal of calibration is calculated by following formula:

The value of the component of " b " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

20, multichannel digital sound back method according to claim 16, wherein, user position information comprises the direction in indication left side, the voice signal of calibration is calculated by following formula:

The value of the component of " c " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

21, a kind of multichannel digital sound calibrator (-ter) unit comprises:

Input unit is used to receive the multi-channel sound signal; With

The sound channel alignment unit is used to store the sound channel calibration matrix that is provided with by the control signal that produces based on user position information, uses matrix calibration multi-channel sound signal of storing and the multi-channel sound signal that carries calibration to a plurality of loud speakers.

22, multichannel digital sound calibrator (-ter) unit according to claim 21, wherein, user position information is imported by user's interface device by the user.

23, multichannel digital sound calibrator (-ter) unit according to claim 22, wherein, user position information comprises that the user wishes that direction and this direction of facing comprise forward and backward a, left side and right when listening to the music.

24, multichannel digital sound calibrator (-ter) unit according to claim 22, wherein, user's interface device is same panel type display (OSD).

25, multichannel digital sound calibrator (-ter) unit according to claim 21, wherein, the sound channel calibration matrix calibration that voice signal is expressed by following formula,

N represents the sequence number of sound channel in the formula, and C1 to Cn represents the multi-channel sound signal respectively, and S1 to Sn represents to be sent to the voice signal of loud speaker 1 to the calibration of loud speaker n respectively, and H11 to Hnn is illustrated in the value of the unit in the sound channel correction matrix.

26, multichannel digital sound calibrator (-ter) unit according to claim 25, wherein, the multi-channel sound signal is 5.1 channel sound signals (n=6).

27, multichannel digital sound calibrator (-ter) unit according to claim 26, wherein, if the user in the face of the direction of multichannel digital sound playback apparatus, then Jiao Zhun voice signal is calculated by following formula:

C1 is the left front channel sound signal of putting in the formula, C2 is the right front channel sound signal of putting, C3 is the left back channel sound signal of putting, C4 is the right back channel sound signal of putting, C5 is the center channels voice signal, C6 is the subwoofer channel sound signal, S1 is the left front channel sound signal of putting of calibration, S2 is the right front channel sound signal of putting of calibration, S3 is the left back channel sound signal of putting of calibration, S4 is the right back channel sound signal of putting of calibration, and S5 is the center channels voice signal of calibration, and S6 is the subwoofer channel sound signal of calibration.

28, according to the multichannel digital sound calibrator (-ter) unit of claim 26, wherein, if the user in the direction that makes his or his back towards the multichannel digital sound playback apparatus, then Jiao Zhun voice signal is calculated by following formula:

The value of the component of " a " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

29, multichannel digital sound calibrator (-ter) unit according to claim 26, wherein, user position information comprises the direction of indicating the right side, the voice signal of calibration is calculated by following formula:

The value of the component of " b " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

30, multichannel digital sound calibrator (-ter) unit according to claim 26, wherein, user position information comprises the direction in indication left side, the voice signal of calibration is calculated by following formula:

The value of the component of " c " is that be contained in calibration left front put channel sound signal and calibration in the formula the right front center channels voice signal of putting channel sound signal.

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