JP2018121309A - Audio processing device, audio output device, television receiver, audio processing method, program, and recording medium for program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily realize multi-channel sound reproduction environment.SOLUTION: A sound data generation unit (111) of a sound processing apparatus (11) generates audio data for each of a plurality of output channel speakers including: a sound bar (12) in which a plurality of speaker groups for outputting sound data for each output channel is arranged in the lateral direction; and a sound bar (13) in which the plurality of speaker groups are arranged in the lateral direction by downmixing audio data of a plurality of input channels.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an audio processing device, an audio output device, a television receiver, an audio processing method, a program, and a program recording medium.

  In advanced BS broadcasting, which is scheduled to start practical broadcasting, not only high-resolution video, but also high-quality stereophonic signals of 22.2 ch (hereinafter, “ch” indicates “channel”) are transmitted for audio. In order to reproduce the audio signals of 22.2 ch and other ch sent in these broadcasts, 22 SPs (hereinafter SP stands for “speaker”) and 2 low-frequency SPs are specified. A 24ch amplifier is required to install the SP and drive the SP.

  In order to more easily reproduce the above stereophonic signal, a technique for converting it into a general surround signal such as 5.1ch has been proposed. For example, Non-Patent Document 1 discloses a conversion formula for downmixing a 22.2 channel signal to a general 5.1 channel signal.

Japanese Patent No. 5604365 (published December 06, 2012) Japanese Patent No. 5852325 (December 06, 2012)

ARIB SRTD-B32 Part 2 (Revised on December 9, 2016)

  The method of Non-Patent Document 1 has a problem that it is not a conversion method that emphasizes the stereophonic effect. In other words, although the upper layer channel that sends a lot of information in 22.2ch and the front channel signal are merged into fewer channels, a planar surround sound image is reproduced, The thickness of the front sound image is reduced.

  Patent Documents 1 and 2 emphasize the information on the front channel, which is important 22.2ch data, and also divide the surround channel signal into an upper layer SP and a middle layer SP, thereby increasing the height direction. A multi-channel speaker device that realizes (stereoscopic) sound reproduction is disclosed. However, in the techniques of Patent Documents 1 and 2, a dedicated speaker is arranged around the television screen, and audio processing according to the dedicated speaker is performed.

  On the other hand, in recent years, reproduction of a three-dimensional sound image such as DolbyAtmos has been demanded. Since the original 22.2ch has sufficient information about the three-dimensional sound image, there is a need for a method for easily realizing the three-dimensional sound image even in a general home without using a dedicated speaker while making use of the information on the three-dimensional sound image. .

  An object of one embodiment of the present invention is to easily realize a multi-channel audio reproduction environment.

  In order to solve the above problems, an audio processing device according to an aspect of the present invention is an audio processing device that generates audio data of a plurality of output channels by downmixing audio data of a plurality of input channels. A first sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction, and a first sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction. And an audio data generation unit that generates audio data for each of a plurality of output channel speakers including two sound bars by downmixing the audio data of the plurality of input channels.

  In order to solve the above problem, an audio processing method according to an aspect of the present invention is an audio processing method for generating audio data of a plurality of output channels by downmixing audio data of a plurality of input channels. The first sound bar in which a plurality of speaker groups that output audio data for each output channel are arranged in the horizontal direction, and the plurality of speaker groups that output audio data in each output channel are arranged in the horizontal direction. A sound data generating step of generating sound data for each of the plurality of output channel speakers including the second sound bar by downmixing the sound data of the plurality of input channels.

  According to one aspect of the present invention, it is possible to easily realize a multi-channel audio reproduction environment.

It is a block diagram which shows the structure of the audio | voice output apparatus which concerns on Embodiment 1 of this invention. It is a front view which shows the external appearance of the television receiver which concerns on Embodiment 1 of this invention. It is a figure which shows the speaker position of the 22.2ch audio | voice data which the audio | voice processing apparatus which concerns on Embodiment 1 of this invention acquires. It is a figure which shows the speaker position of 14.2ch audio | voice data which the audio | voice processing apparatus which concerns on Embodiment 1 of this invention produces | generates. It is a figure which shows the calculation formula of the downmix which concerns on Embodiment 1 of this invention. It is a figure which shows typically the sound field produced | generated when the audio | voice data of 14.2ch which concern on Embodiment 1 of this invention are arrange | positioned and reproduced | regenerated two sound bars which have 7.1ch up and down. It is a figure which shows typically the sound field produced | generated when the audio | voice data of 14.2ch which concern on Embodiment 1 of this invention are arrange | positioned and reproduced | regenerated two sound bars which have 7.1ch up and down. It is a figure which shows the speaker position of 10.2ch audio | voice data which the audio | voice processing apparatus which concerns on Embodiment 2 of this invention produces | generates. It is a figure which shows the calculation formula of the downmix which concerns on Embodiment 2 of this invention. It is a figure which shows the speaker position of the audio | voice data of 8.1ch which the audio | voice processing apparatus which concerns on Embodiment 3 of this invention produces | generates. It is a figure which shows the calculation formula of the downmix which concerns on Embodiment 3 of this invention. Schematic of a sound field generated when an audio data of 8.1ch according to Embodiment 3 of the present invention is reproduced by arranging one sound bar having 3ch and one sound bar having 5.1ch. FIG.

Embodiment 1
Hereinafter, Embodiment 1 of the present invention will be described in detail.

(Configuration of audio output device 1)
FIG. 1 is a block diagram showing a configuration of an audio output device 1 according to the present embodiment. The audio output device 1 includes an audio processing device 11, a sound bar (first sound bar) 12, and a sound bar (second sound bar) 13.

  The audio processing device 11 generates audio data of a plurality of output channels by downmixing audio data of a plurality of input channels. The audio processing device 11 includes an audio data generation unit 111. The audio data generation unit 111 generates audio data for each of the plurality of output channel speakers including the sound bars 12 and 13 by downmixing the audio data of the plurality of input channels.

  The sound bar 12 is formed by arranging a plurality of speaker groups that output audio data for each output channel in the horizontal direction. The sound bar 13 is formed by arranging a plurality of speaker groups that output audio data for each output channel in the horizontal direction.

(Appearance of television receiver 2)
FIG. 2 is a front view showing an appearance of the television receiver 2 according to the present embodiment. The television receiver 2 includes an audio output device 1. As shown in FIG. 2, sound bars 12 and 13 and a screen 14 are arranged on the front surface of the television receiver 2. The sound bar 12 is disposed on the upper side of the screen 14. The sound bar 13 is disposed on the lower side of the screen 14.

(Processing of the voice processing device 11)
The audio processing device 11 acquires 22.2 ch audio data and downmixes to generate 14.2 ch audio data.

  In the following description, each channel of audio data and the speaker position assumed by the channel will be described using the same symbols.

  FIG. 3 is a diagram illustrating speaker positions assumed by 22.2 ch audio data acquired by the audio processing device 11 according to the present embodiment. As shown in FIG. 3, the 22.2ch audio data is composed of 11 SPs (TpFL, TpFC, TpFR, FL, FLC, FC, FRC, FR, BtFL, BtFC, BtFR) arranged in the middle. It is assumed that the data is output from five arranged SPs (TpSiL, TpC, TpSiR, SiL, SiR) and six SPs arranged behind (TpBL, TpBC, TpBR, BL, BC, BR). Yes. In addition, each channel of the 22.2 ch audio data has 9 ch (TpFL, TpFC, TpFR, TpSiL, TpC, TpSiR, TpBL, TpBC, TpBR) as the upper layer, and 10 ch (FL, FLC, FC, FRC, middle layer) as the upper layer. FR, SiL, SiR, BL, BC, BR) and the lower 5ch (BtFL, BtFC, BtFR, LFE1, LFE2).

  It should be noted that the lower layer 2ch (LFE1, LFE2) corresponds to the woofer 0.2ch audio data.

  FIG. 4 is a diagram illustrating speaker positions of 14.2 ch audio data generated by the audio processing device 11 according to the present embodiment. As shown in FIG. 4, the 14.2ch audio data includes six SPs (FL_Tp, FC_Tp, FR_Tp, FL_Bt, FC_Bt, FR_Bt) arranged in front and four virtual SPs (SL_Tp) arranged in the middle. , SR_Tp, SL_Bt, SR_Bt), and four virtual SPs (SBL_Tp, SBR_Tp, SBL_Bt, SBR_Bt) arranged behind are output as output positions. In FIG. 4, the virtual SP is indicated by a dashed outline.

  The audio output device 1 can output 14.2 ch audio data by arranging two sound bars having 7.1 ch above and below and arranging two woofers in a lower layer. Here, of the two sound bars, the sound bar arranged in the upper layer is represented as SoundBar_Tp, and the sound bar arranged in the lower layer is represented as SoundBar_Bt.

  As shown in FIG. 4, the sound bar (SoundBar_Tp) has a speaker group that reproduces sound corresponding to each of the seven channels of SBL_Tp, SL_Tp, FL_Tp, FC_Tp, FR_Tp, SR_Tp, and SBR_Tp. FIG. 4 shows an example in which speakers corresponding to each channel are individually provided. Here, each channel (SL_Tp, SR_Tp, SBL_Tp, SBR_Tp (four in total)) indicated by a broken line in FIG. 4 has a virtual SP (SL_Tp, SR_Tp, SBL_Tp, SBR_Tp) as an output position. A speaker group for reproducing a virtual speaker corresponding to (SoundBar_Tp) is included.

  Similarly, as shown in FIG. 4, the sound bar (SoundBar_Bt) has a group of speakers that reproduce sound corresponding to each of the seven channels SBL_Bt, SL_Bt, FL_Bt, FC_Bt, FR_Bt, SR_Bt, and SBR_Bt. Yes. FIG. 4 shows an example in which speakers corresponding to each channel are individually provided. Here, each channel (SL_Bt, SR_Bt, SBL_Bt, SBR_Bt (four in total)) indicated by broken lines in FIG. 4 corresponds to the above-mentioned virtual SP (SL_Bt, SR_Bt, SBL_Bt, SBR_Bt), and the sound bar A speaker group for reproducing the virtual speaker corresponding to (SoundBar_Bt) is provided.

  The audio output device 1 includes an amplifier that drives the speaker configured as described above.

  In the audio processing device 11, the audio data generation unit 111 downmixes the upper layer audio data of the plurality of input channels into the upper layer audio data of the plurality of output channels, and converts the plurality of middle layer audio data of the plurality of input channels into a plurality. The audio data in the lower layer of the plurality of input channels is merged with the audio data in the lower layer of the plurality of output channels.

  When the 22.2 ch audio data is downmixed to the 14.2 ch audio data, the audio data generation unit 111 converts the 22.2 ch upper layer 9 ch audio data into the 14.2 ch upper layer 7 ch audio data (SBL_Tp, SL_Tp , FL_Tp, FC_Tp, FR_Tp, SR_Tp, SBR_Tp). The audio data generation unit 111 downmixes the 22.2 ch middle layer 10 ch audio data to the 14.2 ch middle layer 7 ch audio data (SBL_Bt, SL_Bt, FL_Bt, FC_Bt, FR_Bt, SR_Bt, SBR_Bt). The audio data generation unit 111 merges the audio data of the lower layer 3ch of 22.2 ch into the audio data of the middle layer 7 ch of 14.2 ch.

  FIG. 5 is a diagram showing a calculation formula for downmix according to the present embodiment.

The audio data generation unit 111 expresses the sense of thickness of the audio by adjusting the distribution coefficient of the middle layer. a, k, v ₁ , v ₂ , w ₁ , w ₂ are general coefficients.

The coefficient a is a coefficient that is set to prevent data from overflowing during the downmix process, and a value between 0 and 1 is arbitrarily set. The coefficient k is a surround channel gain coefficient, and is a coefficient sent by broadcasting. v ₁ and v ₂ are vertical direction coefficients (vertical distribution), and values from 0 to 1 are arbitrarily set. The relationship between the vertical direction coefficients is v ₁ + v ₂ = 1. w ₁ and w ₂ are horizontal coefficients, and values from 0 to 1 are arbitrarily set. Further, the relationship between the horizontal direction coefficients is w ₁ + w ₂ = 1. These coefficients can be arbitrarily set in order to optimize the feeling of expansion according to the positions of the upper and lower SPs (sound bar installation position, television screen size).

Formulas 1 to 7 are formulas for the 14.2 ch middle-layer audio data. As shown in Expression 1, the audio data generation unit 111 generates FL_Bt using FL, FLC, and BtFL. As shown in Expression 2, the audio data generation unit 111 generates FR_Bt using FR, FRC, and BtFR. As shown in Expression 3, the audio data generation unit 111 generates FC_Bt using FC, FRC, FLC, and BtFC. As shown in Expression 4, the audio data generation unit 111 generates SL_Bt using SiL. As shown in Expression 5, the audio data generation unit 111 generates SR_Bt using SiR. As shown in Expression 6, the audio data generation unit 111 generates SBL_Bt using BL and BC.
As shown in Expression 7, the audio data generation unit 111 generates SBR_Bt using BR and BC.

  As shown in Expression 8, the audio data generation unit 111 generates 14.2 ch LFE1 using 22.2 ch LFE1.

  Expressions 9 to 15 are calculation formulas for upper layer audio data of 14.2ch. As shown in Expression 9, the audio data generation unit 111 generates FL_Tp using FL, FLC, and TpFL. As shown in Expression 10, the audio data generation unit 111 generates FR_Tp using FR, FRC, and TpFR. As shown in Expression 11, the audio data generation unit 111 generates FC_Tp using FC, FRC, FLC, TpFC, and TpC. As shown in Expression 12, the audio data generation unit 111 generates SL_TP using TpSiL. As shown in Expression 13, the audio data generation unit 111 generates SR_Tp using TpSiR. As shown in Expression 14, the audio data generation unit 111 generates SBL_Tp using TpBL, TpBC, and TpC. As shown in Expression 15, the audio data generation unit 111 generates SBR_Tp using TpBR, TpBC, and TpC.

  As shown in Expression 16, the audio data generation unit 111 generates 14.2 ch LFE2 using 22.2 ch LFE2.

  FIG. 6 is a diagram schematically showing a sound field generated when the 14.2 ch audio data according to the present embodiment is reproduced by arranging two sound bars having 7 ch above and below.

  In FIG. 6, SF_SoundBar_Tp schematically shows a sound field generated by the sound bar (SoundBar_Tp), and SF_SoundBar_Bt schematically shows a sound field generated by the sound bar (SoundBar_Bt).

[Modification of Embodiment 1]
FIG. 7 is a diagram schematically illustrating a sound field generated when 14.2 ch audio data according to a modification of the present embodiment is reproduced by arranging two sound bars having 7 ch above and below. . As shown in FIG. 7, in this modification, the rear speaker 3 is arranged behind. The rear speaker 3 is a sound source of 4ch (SBL_Tp, SBR_Tp, SBL_Bt, SBR_Bt).

  Since the rear speaker 3 is arranged, the rear speaker 3 takes charge of the SBL_Tp, SBR_Tp, SBL_Bt, and SBR_Bt, which are virtual SPs in FIG. 6, so the audio data generation unit 111 generates the above 4ch audio data for the rear speaker 3. To do. Thereby, a rear sound image is strengthened. As the rear speaker 3, for example, a wireless speaker is used.

  The rear speaker 3 can also be configured as a stereo speaker that outputs L as a combination of SBL_Tp and SBL_Bt as audio data and outputs R as a combination of SBR_Tp and SBR_Bt. As a result, a general wirelessly connected stereo speaker can be used as the rear speaker 3.

[Effect of Embodiment 1]
According to the above configuration, the sound processing apparatus 11 can easily realize a multi-channel sound reproduction environment by using the two sound bars 12 and 13. In particular, when 22.2 ch audio data is downmixed to 14.2 ch audio data, 22.2 ch upper layer audio data is downmixed to 14.2 upper layer audio data, and 22.2 ch middle layer Since the audio data of the lower layer and the lower layer are downmixed and merged with the audio data of the upper layer of 14.2 ch, the audio data of the 22.2 ch of the third layer (upper middle lower) is converted into two sound bars 12, 13 (upper middle ) Can be easily reproduced.

[Embodiment 2]
The second embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  The audio processing device 11 acquires 22.2 ch audio data and downmixes to generate 10.2 ch audio data.

  FIG. 8 is a diagram showing speaker positions of 10.2 ch audio data generated by the audio processing device 11 according to the present embodiment. As shown in FIG. 8, 10.2 ch audio data is composed of six SPs (FL_Tp, FC_Tp, FR_Tp, FL_Bt, FC_Bt, FR_Bt) arranged in front and four virtual SPs (SL_Tp) arranged behind. , SR_Tp, SL_Bt, SR_Bt) are output as output positions. In FIG. 8, the virtual SP is indicated by a dashed outline.

  The audio output device 1 can output 10.2 ch audio data by arranging two sound bars having 5.1 ch up and down and arranging two woofers in the lower layer. Here, of the two sound bars, the sound bar arranged in the upper layer is represented as SoundBar_Tp, and the sound bar arranged in the lower layer is represented as SoundBar_Bt.

  As shown in FIG. 8, the sound bar (SoundBar_Tp) has a speaker group that reproduces sound corresponding to each of the five channels SL_Tp, FL_Tp, FC_Tp, FR_Tp, and SR_Tp. FIG. 8 shows an example in which speakers corresponding to each channel are individually provided. Here, each channel (SL_Tp, SR_Tp (two in total)) indicated by a broken line in FIG. 8 has a virtual SP (SL_Tp, SR_Tp) as an output position, and two surrounds included in the sound bar (SoundBar_Tp). Output individually from the speaker group.

  Similarly, as shown in FIG. 8, the sound bar (SoundBar_Bt) has a speaker group that reproduces sound corresponding to each of the five channels SL_Bt, FL_Bt, FC_Bt, FR_Bt, and SR_Bt. FIG. 8 shows an example in which speakers corresponding to each channel are individually provided. Here, each channel (SL_Bt, SR_Bt (two in total)) indicated by a broken line in FIG. 8 corresponds to the above-described virtual SP (SL_Bt, SR_Bt), and two surrounds that the sound bar (SoundBar_Bt) has. Output individually from the speaker group.

  The audio output device 1 includes an amplifier that drives the speaker configured as described above.

  When 22.2 ch audio data is downmixed to 10.2 ch audio data, the audio data generation unit 111 converts 22.2 ch upper layer 9 ch audio data into 10.2 ch upper layer 5 ch audio data (SL_Tp, FL_Tp , FC_Tp, FR_Tp, SR_Tp). The audio data generation unit 111 downmixes the 22.2 ch middle layer 10 ch audio data to 10.2 ch middle layer 5 ch audio data (SL_Bt, FL_Bt, FC_Bt, FR_Bt, SR_Bt). The audio data generation unit 111 merges the audio data of the 22.2 ch lower layer 3 ch into the 10.2 ch middle layer 3 ch audio data (FL_Bt, FC_Bt, FR_Bt).

  FIG. 9 is a diagram showing a calculation formula for downmix according to the present embodiment.

The audio data generation unit 111 expresses the sense of thickness of the audio by adjusting the distribution coefficient of the middle layer. a, k, v ₁ , v ₂ , w ₁ , w ₂ are general coefficients.

The coefficient a is a coefficient that is set to prevent data from overflowing during the downmix process, and a value between 0 and 1 is arbitrarily set. The coefficient k is a surround channel gain coefficient, and is a coefficient sent by broadcasting. v ₁ and v ₂ are vertical direction coefficients (vertical distribution), and values from 0 to 1 are arbitrarily set. The relationship between the vertical direction coefficients is v ₁ + v ₂ = 1. w ₁ and w ₂ are horizontal coefficients, and values from 0 to 1 are arbitrarily set. Further, the relationship between the horizontal direction coefficients is w ₁ + w ₂ = 1. These coefficients can be arbitrarily set in order to optimize the feeling of expansion according to the positions of the upper and lower SPs (sound bar installation position, television screen size).

  Expressions 17 to 21 are calculation formulas for 10.2 ch middle-layer audio data. As shown in Expression 17, the audio data generation unit 111 generates FL_Bt using FL, SiL, FLC, and BtFL. As shown in Expression 18, the audio data generation unit 111 generates FR_Bt using FR, SiR, FRC, and BtFR. As shown in Expression 19, the audio data generation unit 111 generates FC_Bt using FC, FRC, FLC, and BtFC. As shown in Expression 20, the audio data generation unit 111 generates SL_Bt using BL, BC, and SiL. As shown in Expression 21, the audio data generation unit 111 generates SR_Bt using BR, BC, and SiR.

  As shown in Expression 22, the audio data generation unit 111 generates 10.2 ch LFE1 using 22.2 ch LFE1.

Expressions 23 to 27 are calculation formulas for upper layer audio data of 10.2 ch.
As shown in Expression 23, the audio data generation unit 111 generates FL_Tp using FL, FLC, TpFL, and TpSiL. As shown in Expression 24, the audio data generation unit 111 generates FR_Tp using FR, FRC, TpFR, and TpSiR.
As shown in Expression 25, the audio data generation unit 111 generates FC_Tp using FC, FRC, FLC, TpFC, and TpC. As shown in Expression 26, the audio data generation unit 111 generates SL_Tp using TPBL, TpBC, TpC, and TpSiL. As shown in Expression 27, the audio data generation unit 111 generates TpBR, TpBC, TpC, and so on.

  As shown in Expression 28, the audio data generation unit 111 generates 14.2 ch LFE2 using 22.2 ch LFE2.

[Effect of Embodiment 2]
According to the above configuration, the sound processing apparatus 11 can easily realize a multi-channel sound reproduction environment by using the two sound bars 12 and 13. In particular, when 22.2 ch audio data is downmixed to 10.2 ch audio data, 22.2 ch upper layer audio data is downmixed to 10.2 ch upper layer audio data, and 22.2 ch middle layer Since the audio data of the lower layer and the lower layer are downmixed and merged into the audio data of the middle layer of 10.2 ch, the audio data of the 22.2 ch of the third layer (upper middle and lower) is converted into two sound bars 12, 13 (upper middle ) Can be easily reproduced.

[Embodiment 3]
It will be as follows if Embodiment 3 of this invention is demonstrated based on FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  The audio processing device 11 acquires 22.2 ch audio data and downmixes to generate 8.1 ch audio data.

  FIG. 10 is a diagram illustrating the speaker position of the 8.1ch audio data generated by the audio processing device 11 according to the present embodiment. As shown in FIG. 10, 8.1ch audio data is composed of six SPs (FL_Tp, FC_Tp, FR_Tp, FL_Bt, FC_Bt, FR_Bt) arranged in front and two virtual SPs (SL_Bt) arranged behind. , SR_Bt) is output as an output position. In FIG. 10, the virtual SP is indicated by a dashed outline.

  In the present embodiment, two sound bars are built in the television receiver 2. The audio output device 1 can output 8.1ch audio data by arranging a sound bar having 3ch and a sound bar having 5.1ch above and below, and arranging one woofer in the lower layer. . Here, of the two sound bars, the sound bar arranged in the upper layer is represented as SoundBar_Tp, and the sound bar arranged in the lower layer is represented as SoundBar_Bt.

  As shown in FIG. 10, the sound bar (SoundBar_Tp) has a speaker group that reproduces sound corresponding to each of the three channels FL_Tp, FC_Tp, and FR_Tp. FIG. 10 shows an example in which speakers corresponding to each channel are individually provided.

  As shown in FIG. 10, the sound bar (SoundBar_Bt) has a speaker group that reproduces sound corresponding to each of the five channels SL_Bt, FL_Bt, FC_Bt, FR_Bt, and SR_Bt. FIG. 10 shows an example in which speakers corresponding to each channel are individually provided. Here, each channel (SL_Bt, SR_Bt (two in total)) indicated by a broken line in FIG. 10 corresponds to a virtual SP (SL_Bt, SR_Bt), and two surround speaker groups included in the sound bar (SoundBar_Bt). Are output individually.

  The audio output device 1 includes an amplifier that drives the speaker configured as described above.

  When the 22.2 ch audio data is downmixed to the 8.1 ch audio data, the audio data generation unit 111 converts the 22.2 ch upper layer 9 ch audio data into the 8.1 ch upper layer 3 ch audio data (FL_Tp, FC_Tp , FR_Tp). The audio data generation unit 111 downmixes the audio data of the 22.2 ch middle layer 10 ch to the 8.1 ch middle layer 5 ch audio data (SL_Bt, FL_Bt, FC_Bt, FR_Bt, SR_Bt). The audio data generation unit 111 merges the audio data of the 22.2 ch lower layer 3 ch into the 10.2 ch middle layer 3 ch audio data (FL_Bt, FC_Bt, FR_Bt).

  FIG. 11 is a diagram showing a calculation formula for downmix according to the present embodiment.

The sound data generation unit 111 expresses a three-dimensional sound and a feeling of thickness by adjusting the middle layer distribution coefficient. a, k, v ₁ , v ₂ , w ₁ , w ₂ are general coefficients.

The coefficient a is a coefficient that is set to prevent data from overflowing during the downmix process, and a value between 0 and 1 is arbitrarily set. The coefficient k is a surround channel gain coefficient, and is a coefficient sent by broadcasting. v ₁ and v ₂ are vertical direction coefficients (vertical distribution), and values from 0 to 1 are arbitrarily set. The relationship between the vertical direction coefficients is v ₁ + v ₂ = 1. w ₁ and w ₂ are horizontal coefficients, and values from 0 to 1 are arbitrarily set. Further, the relationship between the horizontal direction coefficients is w ₁ + w ₂ = 1. These coefficients can be arbitrarily set in order to optimize the feeling of expansion according to the positions of the upper and lower SPs (sound bar installation position, television screen size).

  Expressions 29 to 33 are calculation formulas for middle-layer audio data of 8.1ch. As shown in Expression 29, the audio data generation unit 111 generates FL_BT using FL, SiL, FLC, and BtFL. As shown in Expression 30, the audio data generation unit 111 generates FR_Bt using FR, SiR, FRC, and BtFR. As shown in Expression 31, the audio data generation unit 111 generates FC_Bt using FC, FRC, FLC, and BtFC. As shown in Expression 32, the audio data generation unit 111 generates SL_Bt using BL, BC, SiL, TpBL, TpBC, TpC, and TpSiL. As shown in Expression 33, the audio data generation unit 111 generates SR_Bt using BR, BC, SiR, TpBR, TpBC, TpC, and TpSiR.

  As shown in Expression 34, the audio data generation unit 111 generates LFE using LFE1 and LFE2.

  Expressions 35 to 37 are calculation formulas of the upper layer audio data of 8.1ch. As shown in Expression 35, the audio data generation unit 111 generates FL_Tp using FL, FLC, TpFL, and TpSiL. As shown in Expression 36, the audio data generation unit 111 generates FR_Tp using FR, FRC, TpFR, and TpSiR. As shown in Expression 37, the audio data generation unit 111 generates FC_Tp using FC, FRC, FLC, TpFC, and TpC.

[Modification of Embodiment 3]
FIG. 12 shows a sound field generated when audio data of 8.1ch according to the present embodiment is reproduced by arranging one sound bar having 3ch and one sound bar having 5.1ch. It is a figure shown typically. In FIG. 12, SF_SoundBar_Bt schematically shows a sound field generated by a sound bar (SoundBar_Bt).

  As shown in FIG. 12, the rear speaker 3 is arranged behind. The rear speaker 3 is a sound source of 2ch (SL_Bt, SR_Bt).

  By arranging the rear speaker 3, the rear speaker 3 takes charge of SL_Bt and SR_Bt, which are virtual SPs, so the audio data generation unit 111 generates the above-mentioned 2ch audio data for the rear speaker 3. Thereby, a rear sound image is strengthened. As the rear speaker 3, for example, a wireless speaker is used.

[Effect of Embodiment 3]
According to the above configuration, the sound processing apparatus 11 can easily realize a multi-channel sound reproduction environment by using the two sound bars 12 and 13. In particular, when 22.2ch audio data is downmixed to 8.1ch audio data, 22.2ch upper audio data is downmixed to 8.1ch upper audio data, and 22.2ch middle Since the audio data of the lower layer and the lower layer are downmixed and merged into the audio data of the middle layer of 8.1ch, the audio data of the 22.2ch three layers (upper middle and lower) are converted into two sound bars 12, 13 (upper middle ) Can be easily reproduced.

[Example of software implementation]
The control block (audio data generation unit 111) of the audio processing device 11 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or using a CPU (Central Processing Unit). It may be realized by software.

  In the latter case, the voice processing device 11 includes a CPU that executes instructions of a program that is software that implements each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU). Alternatively, a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. Note that one embodiment of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

[Summary]
The sound processing device (11) according to the first aspect of the present invention is a sound processing device that generates sound data of a plurality of output channels by downmixing sound data of a plurality of input channels. And a second sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction. An audio data generation unit (111) is provided that generates audio data for each of the plurality of output channel speakers including the audio data of the plurality of input channels by downmixing the audio data.

  According to the above configuration, a multi-channel audio reproduction environment can be easily realized by using two sound bars.

  In the audio processing device according to aspect 2 of the present invention, in the above aspect 1, the audio data generation unit downmixes the audio data in the upper layer of the plurality of input channels to the audio data in the upper layer of the plurality of output channels. The audio data in the middle layer of the plurality of input channels is downmixed to the audio data in the middle layer of the plurality of output channels, and the audio data in the lower layer of the plurality of input channels is converted into the audio data in the middle layer of the plurality of output channels. May be merged.

  According to the above configuration, the upper layer audio data of the plurality of input channels is downmixed to the upper layer audio data of the plurality of output channels, and the middle layer and lower layer audio data of the plurality of input channels are converted to the plurality of output channels. Since down-mixing and merging with the middle layer audio data, the third layer (upper middle and lower) voice data of a plurality of input channels can be easily reproduced with two sound bars (upper middle).

  The sound processing apparatus according to aspect 3 of the present invention is the sound processing apparatus according to aspect 2, in which, when the sound data generation unit downmixes the 22.2 ch audio data to the 14.2 ch audio data, The upper layer 9ch audio data is downmixed to the upper layer 7ch audio data of the plurality of output channels, and the middle layer 10ch audio data of the plurality of input channels is downmixed to the middle layer 7ch audio data of the plurality of output channels. The lower layer 3ch audio data of the plurality of input channels may be merged with the middle layer 7ch audio data of the plurality of output channels.

  According to the above configuration, when down-mixing 22.2 ch audio data to 14.2 ch audio data, the three layers (upper, middle and lower) of audio data can be easily obtained with two sound bars (upper, middle) Can be reproduced.

  An audio output device (1) according to an aspect 4 of the present invention includes the audio processing device (11) according to any one of the above aspects 1 to 3, and a plurality of speaker groups that output audio data for each output channel arranged in the horizontal direction. And a second sound bar (13) in which a plurality of speaker groups that output audio data for each output channel are arranged in the horizontal direction.

  According to the above configuration, multi-channel audio can be downmixed and output by using two sound bars.

  The television receiver (2) according to aspect 5 of the present invention includes the audio output device according to aspect 4 described above.

  An audio processing method according to aspect 6 of the present invention is an audio processing method for generating audio data of a plurality of output channels by downmixing audio data of a plurality of input channels, wherein the audio data for each output channel is generated. A first sound bar in which a plurality of speaker groups to be output are arranged in a horizontal direction; and a second sound bar in which a plurality of speaker groups to output audio data for each output channel are arranged in a horizontal direction. A sound data generating step of generating sound data for each of the plurality of output channel speakers by downmixing the sound data of the plurality of input channels;

  The speech processing apparatus according to each aspect of the present invention may be realized by a computer. In this case, the speech processing apparatus is operated on each computer by causing the computer to operate as each unit (software element) included in the speech processing apparatus. The program of the voice processing apparatus to be realized in this way and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

DESCRIPTION OF SYMBOLS 1 Audio | voice output apparatus 11 Audio | voice processing apparatus 12 Sound bar (1st sound bar)
13 Sound bar (second sound bar)
111 Audio data generator 2 Television receiver

Claims (8)

In an audio processing device that generates audio data of a plurality of output channels by downmixing audio data of a plurality of input channels,
A first sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction, and a first sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction. And an audio data generator for generating audio data for each of a plurality of output channel speakers including two sound bars by downmixing the audio data of the plurality of input channels. Processing equipment. The voice data generation unit
Downmix the upper layer audio data of the plurality of input channels to the upper layer audio data of the plurality of output channels,
Downmix the middle layer audio data of the plurality of input channels to the middle layer audio data of the plurality of output channels,
Merging lower layer audio data of the plurality of input channels with middle layer audio data of the plurality of output channels;
The speech processing apparatus according to claim 1. The voice data generation unit
When downmixing 22.2ch audio data to 14.2ch audio data,
Downmixing the upper layer 9ch audio data of the plurality of input channels to the upper layer 7ch audio data of the plurality of output channels,
Downmixing the middle layer 10ch audio data of the plurality of input channels to the middle layer 7ch audio data of the plurality of output channels,
The audio data of the lower layer 3ch of the plurality of input channels are merged with the audio data of the middle layer 7ch of the plurality of output channels.
The speech processing apparatus according to claim 2. The voice processing device according to any one of claims 1 to 3,
A first sound bar in which a plurality of speaker groups that output audio data for each output channel are arranged in a horizontal direction;
A second sound bar in which a plurality of speaker groups that output audio data for each output channel are arranged in a horizontal direction;
An audio output device comprising:   A television receiver comprising the audio output device according to claim 4. An audio processing method for generating audio data of a plurality of output channels by downmixing audio data of a plurality of input channels,
A first sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction, and a first sound bar in which a plurality of speaker groups for outputting audio data for each output channel are arranged in the horizontal direction. And an audio data generation step for generating audio data for each of a plurality of output channel speakers including two sound bars by downmixing the audio data of the plurality of input channels. Processing method.   A program for causing a computer to function as the speech processing apparatus according to any one of claims 1 to 3, wherein the program causes the computer to function as the speech data generation unit.   A computer-readable recording medium on which the program according to claim 7 is recorded.

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