JP2013537773A - Multi-channel audio compatible system and method - Google Patents

Abstract

  A multi-channel audio conversion method and system is disclosed. The multi-channel audio conversion system includes an output position confirmation unit for confirming an output position for each channel of the output multi-channel audio signal and the input multi-channel audio signal, and for each channel of the output multi-channel audio signal and the input multi-channel audio signal. When there are an input channel and an output channel with the same output position, a signal allocator for assigning the channel signal of the input channel to the output channel, and a channel of the output multi-channel audio signal closest to the channel of the input multi-channel audio signal A signal distributor for distributing the channel signal of the input multi-channel audio signal to two; a channel signal assigned to each channel of the output multi-channel audio signal; or an output multi-channel based on the distributed channel signal And a channel signal calculation unit for calculating a channel-specific signal Le audio signal.

Description

  The present invention relates to a multi-channel audio conversion system and method, and more particularly to a system and method for converting a 10.2 channel audio signal into another multi-channel audio signal.

  The multi-channel audio playback technology starts with 2-channel stereo and has been expanded to 5.1 channels and 7.1 channels. Recently, a 22.2 channel audio playback system using three layers has been developed.

  However, although the 22.2 channel audio system has a high sound field reproduction performance, it requires an extremely large number of speakers, so that it has a limit that it is difficult to secure a sufficient space such as a home and to apply it to a difficult environment. It was.

  Thus, a new multi-channel capable of providing a sound field similar to 22.2 channel with less than 22.2 channel speakers, and 2.0 / 5.1 / 7. There is a need for a method that can be compatible with one channel and the newly standardized 22.2 channel.

  The present invention is a system capable of converting 10.2 channel audio signals capable of providing a sound field similar to 22.2 channels into other multi-channel audio signals using fewer than 22.2 channel speakers and Provide a method.

  A multi-channel audio conversion system according to an embodiment of the present invention includes an output position confirmation unit that confirms an output position for each channel of an output multi-channel audio signal and an input multi-channel audio signal, an output multi-channel audio signal, and an input multi-channel. When there is an input channel and an output channel with the same output position for each channel in the audio signal, a signal allocation unit that assigns the channel signal of the input channel to the output channel, and the closest channel to the channel of the input multi-channel audio signal A signal distributor for distributing the channel signal of the input multi-channel audio signal to two channels of the output multi-channel audio signal, a channel signal assigned to each channel of the output multi-channel audio signal, or a distributed channel signal And a channel signal calculation unit for calculating a channel-specific signal of the output circle channel audio signal based on.

  When the input multi-channel audio signal is a 22.2 channel audio signal, the channel signal calculation unit of the multi-channel audio conversion system according to an embodiment of the present invention may include an upper layer, a middle layer, a lower layer, and a subwoofer. The overall sound level of the output multichannel audio signal may be adjusted by multiplying a specific constant for each channel.

  The channel signal calculation unit of the multi-channel audio conversion system according to an embodiment of the present invention has a channel located on a plane and the height when the input multi-channel audio signal is a 10.2 channel audio signal. The overall sound level of the output multi-channel audio signal may be adjusted by multiplying a specific constant for each channel and subwoofer channel.

  A multi-channel audio conversion method according to an embodiment of the present invention includes a step of confirming output positions of an output multi-channel audio signal and an input multi-channel audio signal for each channel, and an output multi-channel audio signal and an input multi-channel audio signal. Of these, the step of checking whether there is an input channel and an output channel with the same output position for each channel, and of the output multichannel audio signal and the input multichannel audio signal, the output position for each channel is the same channel. When there is an input channel and an output channel, when there is no channel having the same output position for each channel among the step of assigning the channel signal of the input channel to the output channel and the output multi-channel audio signal and the input multi-channel audio signal, Enter Distributing the channel signal of the input multi-channel audio signal to two channels of the output multi-channel audio signal closest to the channel of the multi-channel audio signal; and a channel signal assigned to each channel of the output multi-channel audio signal; Or calculating a signal for each channel of the output multi-channel audio signal based on the distributed channel signal.

  The present invention converts 10.2 channel audio signals, which can provide a sound field similar to 22.2 channels, using less than 22.2 channel speakers to other multi-channel audio signals. The compatibility of two-channel audio signals can be increased.

1 is a block diagram illustrating a configuration of a multi-channel audio conversion system according to an embodiment of the present invention. It is a figure which shows an example of the layout of the conventional 22.2 channel audio signal. It is a figure which shows an example of the layout of a 10.2 channel audio signal which concerns on this invention. It is a figure which shows an example of the matching between L channel signals of a 22.2 channel audio signal and a 10.2 channel multi channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between the C channel signal of a 22.2 channel audio signal and a 10.2 channel multi-channel audio signal which concerns on one Embodiment of this invention. It is a figure which shows an example of the matching between the LH channel signal of a 22.2 channel audio signal and a 10.2 channel multi-channel audio signal which concerns on one Embodiment of this invention. It is a figure which shows an example of the matching between the LS channel signal of a 22.2 channel audio signal and a 10.2 channel multichannel audio signal which concerns on one Embodiment of this invention. It is a figure which shows an example of the matching between LB channel signals of a 22.2 channel audio signal and a 10.2 channel multichannel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between L channel signals of 10.2 channel audio signal and 7.1 channel multi-channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of matching between LB channel signals of 10.2 channel audio signal and 7.1 channel multi-channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between LS channel signals of 10.2 channel audio signal and 5.1 channel multi-channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between the L channel signal of 10.2 channel audio signal and 2.0 channel multi-channel audio signal which concerns on one Embodiment of this invention. 3 is a flowchart illustrating a multi-channel audio conversion method according to an embodiment of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The multi-channel audio conversion method according to an embodiment of the present invention may be performed by a multi-channel audio conversion system.

  FIG. 1 is a block diagram showing a configuration of a multi-channel audio conversion system according to an embodiment of the present invention.

  A multi-channel audio conversion system according to an embodiment of the present invention can provide a sound field effect similar to a 22.2 channel audio signal using a smaller number of channels than a 22.2 channel audio signal 10. .Converts 2-channel audio signals to other multi-channel audio signals.

  Referring to FIG. 1, the multi-channel audio conversion system includes an output position confirmation unit 110, a signal allocation unit 120, a signal distribution unit 130, and a channel signal calculation unit 140.

  The output position confirmation unit 110 confirms the output position for each channel of the input multichannel audio signal input from the user and the output position for each channel of the output multichannel audio signal generated by converting the input multichannel audio signal. .

  Here, the input multi-channel audio signal may be a 22.2 channel audio signal as shown in FIG. Here, the 22.2 channel audio signal is arranged such that the channel signal output position of each channel is 210, and each channel is set in the structure 220 including the upper layer 221, the middle layer 222, and the lower layer 223. Is done.

  The upper layer 221 includes a channel output from a high position with reference to the user, the middle layer 222 includes a channel output from a height like the user, and the lower layer includes a user as a reference. A channel output at a low position or a subwoofer channel may be included.

  Further, as shown in FIG. 3, the 10.2 channel audio signal according to the present invention sets the output position of seven channels on a plane as high as the user as the center, and has a high height with reference to the user. 3 sub-woofer channels are provided by setting the output position of three channels having the same length.

  Specifically, the seven channels on the plane are a C (Center) channel in which the output position is arranged at the front center of the user, and L / R (Left) in which the output positions are arranged at ± 30 ° positions in front of the user. / Right) channel, LS / RS (Left Side / Right Side) channel in which the output position is arranged at ± 90 ° position of the user, and LB / RB (Left Back) in which the output position is arranged at ± 150 ° position of the user. / Right Back) channel.

  Also, the three channels having a high height are an LH / RH (Left Height / Right Height) channel in which an output position is arranged at an upper 30 ° to 45 ° position above the L / R channel, and an upper side of the user. A TC (Top Center) channel in which the output position is arranged may be included.

  In the multi-channel audio conversion system, when the input multi-channel audio signal is a 10.2 channel audio signal, 10.1 channel audio signal, 5.1 channel audio signal, 2.0 channel audio signal, etc. A multi-channel audio signal that uses a smaller number of audio output devices than two channels may be used as the output multi-channel audio signal.

  When there is an input channel and an output channel in which the output position of each channel is the same among the output multi-channel audio signal and the input multi-channel audio signal, the signal allocation unit 120 converts the channel signal of the input channel to the output channel. assign.

  As an example, when the output positions of the 22: 2 channel SiL channel and the 10.2 channel LS channel are the same, the signal allocation unit 120 supports the LS channel by allocating the channel signal of the SiL channel to the LS channel. The channel output signal of the SiL channel is reproduced by the audio output device.

ずつ分割して分配する。 The signal distributor 130 assigns the channel signal of the input multichannel audio signal to the two channels of the output multichannel audio signal closest to the channel of the input multichannel audio signal.

Divide and distribute each.

ＴｐＦｃチャネル信号を分配してもよい。 As an example, in the case of a TpFc (Top forward center) channel that is output to an output device located at a high position in the center of the 22: 2 channel, the signal distribution unit 130 is respectively connected to the LH channel and the RH channel at the same height.

The TpFc channel signal may be distributed.

  The channel signal calculation unit 140 calculates a channel-specific signal of the output multi-channel audio signal based on the channel signal assigned to each channel of the output multi-channel audio signal or the distributed channel signal.

  As an example, when converting a 22.2 channel audio signal into a 10.2 channel audio signal, the channel signal calculation unit 140 multiplies a specific constant for each of the upper layer, the middle layer, the lower layer, and the subwoofer channel. Adjust the overall sound level of the output multichannel audio signal.

  When converting the 22.2 channel audio signal to the 10.2 channel audio signal, the process by which the channel signal calculation unit 140 calculates the signal for each channel will be described in detail with reference to FIGS.

  As another example, when the 10.2 channel audio signal is converted to a channel audio signal having fewer than 10.2 channels, the channel signal calculation unit 140 has a channel located on a plane and a height and a subwoofer channel. Alternatively, the overall sound level of the output multichannel audio signal may be adjusted by multiplying each by a specific constant.

  When the 10.2 channel audio signal is converted into an output multi-audio signal using less than 10.2 channels, the process in which the channel signal calculation unit 140 calculates the signal for each channel will be described with reference to FIGS. 12 will be described in detail.

When converting a 22.2 channel audio signal to which a multi-channel audio conversion system according to an embodiment of the present invention is input into a 10.2 channel audio signal, the channel signal calculation unit 140 uses 10. The signal for each channel of the channel is calculated.

  As an example, the channel signal calculation unit 140 includes a FL (Forward Left) channel, an FLc (Forward Left center) channel, and a BtFL (Bottom Forward Left) among 22.2 channel audio signals 410 as shown in Table 1 and FIG. ) Calculate the L channel channel signal of the 10.2 channel output multi-channel audio signal 420 based on the channel signal. Here, the FL channel and the BtFL channel have the same output position as the L channel, and the FLc channel is a channel between the L channel and the C channel.

を乗算した値にそれぞれ中位レイヤと設定された定数ｍを乗算し、下位レイヤであるＢｔＦＬチャネルのチャネル信号に下位レイヤと設定された定数ｂを乗算した後、前記結果値を加えてＬチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 converts the channel signal of the FL channel that is the middle layer and the channel signal of the FLc channel.

Is multiplied by a constant m set for the middle layer and the channel signal of the lower layer BtFL channel is multiplied by a constant b set for the lower layer, and the result value is added to the L channel. The final channel signal of is calculated.

  In addition, since the output position of the R channel is bilaterally symmetric with the L channel, the channel signal calculation unit 140 performs the FR (Forward Right) channel, FRc, which is a channel whose output position is bilaterally symmetric with the channel used for the L channel. The channel signal of the R channel is calculated using the channel signal of the (Forward Right center) channel and the BtFR (Bottom Forward Right) channel.

  As another example, as shown in Table 1 and FIG. 5, the channel signal calculation unit 140 includes an FC (Forward Center) channel, an FLc channel, an FRc channel, and a BtFC (Bottom Forward Center) among 22.2 channel audio signals 510. Based on the channel signal of the channel, the C channel signal of the 10.2 channel output multi-channel audio signal 520 is calculated. Here, the FC channel and the BtFC channel have the same output position as the C channel, the FLc channel is a channel between the L channel and the C channel, and the FRc channel is a channel between the R channel and the C channel. .

を乗算した値、ＦＲｃチャネルのチャネル信号に

を乗算した値にそれぞれ中位レイヤと設定された定数ｍを乗算し、下位レイヤであるＢｔＦＣチャネルに下位レイヤと設定された定数ｂを乗算した後、前記結果値を加えてＣチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 converts the channel signal of the FC layer that is the middle layer and the channel signal of the FLc channel.

Multiplied by the channel signal of the FRc channel

Are multiplied by a constant m set for the middle layer and the BtFC channel which is the lower layer, respectively, and a constant b set for the lower layer is added to the lower layer, and the result value is added to obtain the final channel of the C channel. Calculate the signal.

を乗算した値にそれぞれ上位レイヤと設定された定数ｔを乗算した後、前記結果値を加えてＬＨチャネルの最終チャネル信号を算出する。 As another example, as shown in Table 1 and FIG. 6, the channel signal calculation unit 140 converts TpFL (top forward left) channel signals and TpFC (top forward center) channel signals out of 22.2 channel audio signals 610. Based on this, the LH channel signal of the 10.2 channel output multichannel audio signal 620 is calculated. Here, the channel signal of the TpFL channel is a channel having the same output position as the LH channel, and the TpFC channel is a channel between the LH channel and the RH channel. Specifically, the channel signal calculation unit 140 converts the channel signal of the TpFL channel and the channel signal of the TpFC channel that are upper layers.

Is multiplied by a constant t set for the upper layer, and the result value is added to calculate the final channel signal of the LH channel.

  Further, since the output position of the RH channel is bilaterally symmetrical with the L channel, the channel signal calculation unit 140 includes a TpFR (top forward right) channel, which is a channel whose output position is symmetrical with the channel used for the LH channel, The channel signal of the RH channel may be calculated using the channel signal of the TpFC channel.

  As another example, as shown in Table 1 and FIG. 7, the channel signal calculation unit 140 is based on the TpSiL channel of the 22.2 channel audio signal 710 and the channel signal of the SiL channel. The channel signal of the LS channel of the audio signal 720 is calculated. Here, the TpSiL channel and the SiL channel are channels having the same output position as the LS channel.

  Specifically, the channel signal calculation unit 140 multiplies the channel signal of the SiL channel that is the middle layer by the constant m set as the middle layer, and is set as the upper layer to the channel signal of the TpSiL channel that is the upper layer. Then, the final value of the LS channel is calculated by adding the result value.

  Further, since the output position of the RS channel is bilaterally symmetric with the LS channel, the channel signal calculation unit 140 includes a channel used for the LS channel and a TpSiR channel that is symmetric with respect to the output position, and a channel of the SiR channel. The channel signal of the RS channel may be calculated using the signal.

  As another example, as shown in Table 1 and FIG. 8, the channel signal calculation unit 140 includes a TpBL (TopBackwardLeft) channel, a TpBC (TopBackwardCenter) channel, a BC (BackwardCenter) channel, and a BL, among 22.2 channel audio signals 810. Based on the (BackwordLeft) channel signal, the LB channel signal of the 10.2 channel output multichannel audio signal 820 is calculated. Here, the TpBL channel and the BL channel are channels having the same output position as the LB channel, and the TpBC channel and the BC channel are channels between the LB channel and the RB channel.

を乗算した値にそれぞれ中位レイヤと設定された定数ｍを乗算し、上位レイヤであるＴｐＢＬチャネルのチャネル信号とＴｐＢＣチャネルのチャネル信号に

を乗算した値にそれぞれ上位レイヤと設定された定数ｔを乗算した後、前記結果値を加えてＬＢチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 converts the channel signal of the middle layer, the BL channel, and the BC channel.

Is multiplied by a constant m set for the middle layer, and the channel signal of the TpBL channel and the channel signal of the TpBC channel, which are upper layers, are multiplied.

Is multiplied by a constant t set with the upper layer, and the result value is added to calculate the final channel signal of the LB channel.

  Further, since the output position of the RB channel is bilaterally symmetric with the L channel, the channel signal calculation unit 140 includes a TpBR (TopBackwardRight) channel, a TpBC (TpBC (Right) channel) among the channels symmetric with the output position of the channel used for the LB channel. The channel signal of the RB channel may be calculated by using the channel signal of the TopBackwardCenter (BC) channel, the BC (BackwardCenter) channel, and the BR (BackwardRight) channel.

When converting a 10.2 channel audio signal to which a multi-channel audio conversion system according to an embodiment of the present invention is input into a 7.1 channel audio signal, the channel signal calculation unit 140 uses the table 2 to set 7.1. The signal for each channel of the channel is calculated.

  As an example, the channel signal calculation unit 140, as shown in Table 1 and FIG. 9, can select the L channel of the 7.1 channel audio signal 920 based on the L channel and LH channel channel signals from the 10.2 channel audio signal 910. The channel signal is calculated. Here, the L channel and the LH channel of the 10.2 channel audio signal 910 have the same output position as the L channel of the 7.1 channel audio signal 920. Further, the channel signal calculation unit 140 may set a constant a for a channel located on a plane and set a constant c for a channel having a height.

  Specifically, the channel signal calculation unit 140 multiplies the L channel of the 10.2 channel audio signal 910 of the channel located on the same plane as the user by a preset constant a, and is an LH channel having a height. After multiplying the channel by a preset constant c, the result value is added to calculate the L channel final channel signal of the 7.1 channel audio signal 920.

  Also, since the output position of the R channel is symmetric with respect to the L channel, the channel signal calculation unit 140 generates a 10.2 channel audio signal 910 that is symmetric with respect to the channel used for the L channel and the output position. The R channel channel signal of the 7.1 channel audio signal 420 may be calculated using the R channel and RH channel channel signals.

  As another example, as shown in Table 1 and FIG. 10, the channel signal calculation unit 140 generates a 7.1 channel audio signal 1020 based on the LB channel and TC channel channel signals of the 10.2 channel audio signal 1010. The channel signal of the LB channel is calculated. Here, the LB channel of the 10.2 channel audio signal 920 has the same output position as the LB channel of the 7.1 channel audio signal 1020, and the TC channel is the LB channel and RB channel of the 7.1 channel audio signal 1020. It is a channel in between.

を乗算した値に予め設定された定数ｃを乗算した後、前記結果値を加えて７．１チャネルオーディオ信号４２０のＬＢチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 is a channel having a height by multiplying the LB channel of the 10.2 channel audio signal 910 that is a channel located on the same plane as the user by a preset constant a. TC channel channel signal, which is a channel between LB channel and RB channel

Is multiplied by a preset constant c, and the result value is added to calculate the final channel signal of the LB channel of the 7.1-channel audio signal 420.

  In addition, since the output position of the RB channel is bilaterally symmetrical with the LB channel, the channel signal calculation unit 140 outputs the 10.2 channel audio signal 910 that is a channel whose output position is symmetrical with the channel used for the LB channel. The channel signal of the RB channel of the 7.1 channel audio signal 420 may be calculated using the channel signals of the RB channel and the TC channel.

When the 10.2 channel audio signal input to the multi-channel audio conversion system according to an embodiment of the present invention is converted to a 5.1 channel audio signal, the channel signal calculation unit 140 uses the table 3 to calculate the 5.1 channel. The signal for each channel is calculated.

  As an example, the channel signal calculation unit 140 generates a 7.1-channel audio signal 1120 based on the LS channel, LB channel, and TC channel channel signals out of the 10.2 channel audio signal 1110 as shown in Table 1 and FIG. The channel signal of the LS channel is calculated. Here, the TC channel of the 10.2 channel audio signal 1110 is a channel located between the LS channel and the RS channel of the 7.1 channel audio signal 920.

を乗算した値に予め設定された定数ｃを乗算した後、前記結果値を加えて７．１チャネルオーディオ信号４２０のＬＳチャネルの最終チャネル信号を算出する。ここで、１０．２チャネルのＬＳチャネルは５．１チャネルのＬチャネルとＬＳチャネルの中間に位置しているが、１０．２チャネルのＬＳチャネルは後面と判断されるサイドチャネルであるため、チャネル信号算出部１４０は１０．２チャネルのＬＳチャネルをＬチャネルに分配せず、５．１チャネルの後面に位置するＬＳチャネルにのみ印加してもよい。 Specifically, the channel signal calculation unit 140 multiplies the LS channel and the LB channel of the 10.2 channel audio signal 910 of the channel located on the same plane as the user by a constant a set in advance, and has a height. There is a channel signal of TC channel which is a channel between LS channel and RS channel

Is multiplied by a preset constant c, and the result value is added to calculate the final channel signal of the LS channel of the 7.1-channel audio signal 420. Here, the 10.2 channel LS channel is located between the 5.1 channel L channel and the LS channel, but the 10.2 channel LS channel is a side channel that is determined to be the rear surface. The signal calculation unit 140 may not apply the 10.2 LS channel to the L channel, but may apply the LS channel only to the LS channel located on the rear surface of the 5.1 channel.

  Further, since the output position of the RS channel is symmetric with respect to the LS channel, the channel signal calculation unit 140 is configured to output a 10.2 channel audio signal 1110 that is symmetric with respect to the channel used for the LB channel. The channel signal of the RS channel of the 7.1 channel audio signal 420 may be calculated using the channel signals of the RS channel, the RB channel, and the TC channel.

When the 10.2-channel audio signal input to the multi-channel audio conversion system according to an embodiment of the present invention is converted into a 2.0-channel audio signal, the channel signal calculation unit 140 uses the table 4 to specify 2.0. The signal for each channel of the channel is calculated.

  As an example, the channel signal calculation unit 140 converts L channel, C channel, LH channel, LS channel, LB channel, and TC channel channel signals out of the 10.2 channel audio signal 1110 as shown in Table 1 and FIG. Based on this, the channel signal of the L channel of the 7.1 channel audio signal 1120 is calculated. Here, the channel signal calculation unit 140 outputs the channel signal so that the magnitude of the output in which the sound of the rear channel is mapped forward is smaller than the magnitude of the output in which the sound of the front channel is mapped forward. calculate.

  FIG. 13 is a flowchart illustrating a multi-channel audio conversion method according to an embodiment of the present invention.

  In step S1310, the output position confirmation unit 110 confirms the output positions of the output multichannel audio signal and the input multichannel audio signal for each channel.

  In step S1320, the output position confirmation unit 110 confirms whether there is a channel having the same output position for each channel among the output multichannel audio signal and the input multichannel audio signal. Here, an input multi-audio signal channel having the same output position for each channel is referred to as an input channel, and an output multi-audio signal channel having the same output position for each channel is referred to as an output channel. If there is no channel having the same output position for each channel between the output multi-channel audio signal and the input multi-channel audio signal, the signal allocation unit 120 allocates the channel signal of the input channel to the channel at the same position in step S1330. Also good. That is, if there are an input channel and an output channel among the output multichannel audio signal and the input multichannel audio signal, the signal allocation unit 120 allocates the channel signal of the input channel to the output channel in step S1330. On the other hand, if there is no channel whose output position for each channel is the same between the output multi-channel audio signal and the input multi-channel audio signal, in step S1340, the signal distributor 130 is closest to the channel of the input multi-channel audio signal. Check two channels of the output multi-channel audio signal.

  In step S1350, the signal distributor 130 distributes the channel signal of the input multi-channel audio signal to the adjacent channel confirmed in step S1340.

  In step S1360, channel signal calculation section 140 calculates the output of the output audio signal for each channel based on the channel signal assigned in step S1330 or the channel signal distributed in step S1350.

  Specifically, the channel signal calculation unit 140 calculates the output of the output audio signal for each channel using Tables 1 to 4.

  The present invention converts 10.2 channel audio signals, which can provide a sound field similar to 22.2 channels, using less than 22.2 channel speakers to other multi-channel audio signals. The compatibility of two-channel audio signals can be increased.

  As described above, the present invention has been described with reference to the limited embodiments and drawings. However, the present invention is not limited to the above-described embodiments, and any person having ordinary knowledge in the field to which the present invention belongs can be used. Various modifications and variations are possible from such description.

  Therefore, the scope of the present invention is not limited to the described embodiments, but is defined by the claims and the equivalents of the claims.

110: Channel position confirmation unit 120: Signal allocation unit 130: Signal distribution unit 140: Channel signal calculation unit

  The present invention relates to a multi-channel audio conversion system and method, and more particularly to a system and method for converting a 10.2 channel audio signal into another multi-channel audio signal.

  The multi-channel audio playback technology starts with 2-channel stereo and has been expanded to 5.1 channels and 7.1 channels. Recently, a 22.2 channel audio playback system using three layers has been developed.

  However, although the 22.2 channel audio system has a high sound field reproduction performance, it requires an extremely large number of speakers, so that it has a limit that it is difficult to secure a sufficient space such as a home and to apply it to a difficult environment. It was.

  Thus, a new multi-channel capable of providing a sound field similar to 22.2 channel with less than 22.2 channel speakers, and 2.0 / 5.1 / 7. There is a need for a method that can be compatible with one channel and the newly standardized 22.2 channel.

  The present invention is a system capable of converting 10.2 channel audio signals capable of providing a sound field similar to 22.2 channels into other multi-channel audio signals using fewer than 22.2 channel speakers and Provide a method.

  A multi-channel audio conversion system according to an embodiment of the present invention includes an output position confirmation unit that confirms an output position for each channel of an output multi-channel audio signal and an input multi-channel audio signal, an output multi-channel audio signal, and an input multi-channel. When there is an input channel and an output channel with the same output position for each channel in the audio signal, a signal allocation unit that assigns the channel signal of the input channel to the output channel, and the closest channel to the channel of the input multi-channel audio signal A signal distributor for distributing the channel signal of the input multi-channel audio signal to two channels of the output multi-channel audio signal, a channel signal assigned to each channel of the output multi-channel audio signal, or a distributed channel signal And a channel signal calculation unit for calculating a channel-specific signal of the output circle channel audio signal based on.

  When the input multi-channel audio signal is a 22.2 channel audio signal, the channel signal calculation unit of the multi-channel audio conversion system according to an embodiment of the present invention may include an upper layer, a middle layer, a lower layer, and a subwoofer. The overall sound level of the output multichannel audio signal may be adjusted by multiplying a specific constant for each channel.

  The channel signal calculation unit of the multi-channel audio conversion system according to an embodiment of the present invention has a channel located on a plane and the height when the input multi-channel audio signal is a 10.2 channel audio signal. The overall sound level of the output multi-channel audio signal may be adjusted by multiplying a specific constant for each channel and subwoofer channel.

  A multi-channel audio conversion method according to an embodiment of the present invention includes a step of confirming output positions of an output multi-channel audio signal and an input multi-channel audio signal for each channel, and an output multi-channel audio signal and an input multi-channel audio signal. Of these, the step of checking whether there is an input channel and an output channel with the same output position for each channel, and of the output multichannel audio signal and the input multichannel audio signal, the output position for each channel is the same channel. When there is an input channel and an output channel, when there is no channel having the same output position for each channel among the step of assigning the channel signal of the input channel to the output channel and the output multi-channel audio signal and the input multi-channel audio signal, Enter Distributing the channel signal of the input multi-channel audio signal to two channels of the output multi-channel audio signal closest to the channel of the multi-channel audio signal; and a channel signal assigned to each channel of the output multi-channel audio signal; Or calculating a signal for each channel of the output multi-channel audio signal based on the distributed channel signal.

  The present invention converts 10.2 channel audio signals, which can provide a sound field similar to 22.2 channels, using less than 22.2 channel speakers to other multi-channel audio signals. The compatibility of two-channel audio signals can be increased.

1 is a block diagram illustrating a configuration of a multi-channel audio conversion system according to an embodiment of the present invention. It is a figure which shows an example of the layout of the conventional 22.2 channel audio signal. It is a figure which shows an example of the layout of a 10.2 channel audio signal which concerns on this invention. It is a figure which shows an example of the matching between L channel signals of a 22.2 channel audio signal and a 10.2 channel multi channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between the C channel signal of a 22.2 channel audio signal and a 10.2 channel multi-channel audio signal which concerns on one Embodiment of this invention. It is a figure which shows an example of the matching between the LH channel signal of a 22.2 channel audio signal and a 10.2 channel multi-channel audio signal which concerns on one Embodiment of this invention. It is a figure which shows an example of the matching between the LS channel signal of a 22.2 channel audio signal and a 10.2 channel multichannel audio signal which concerns on one Embodiment of this invention. It is a figure which shows an example of the matching between LB channel signals of a 22.2 channel audio signal and a 10.2 channel multichannel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between L channel signals of 10.2 channel audio signal and 7.1 channel multi-channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of matching between LB channel signals of 10.2 channel audio signal and 7.1 channel multi-channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between LS channel signals of 10.2 channel audio signal and 5.1 channel multi-channel audio signal which concern on one Embodiment of this invention. It is a figure which shows an example of the matching between the L channel signal of 10.2 channel audio signal and 2.0 channel multi-channel audio signal which concerns on one Embodiment of this invention. 3 is a flowchart illustrating a multi-channel audio conversion method according to an embodiment of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The multi-channel audio conversion method according to an embodiment of the present invention may be performed by a multi-channel audio conversion system.

  FIG. 1 is a block diagram showing a configuration of a multi-channel audio conversion system according to an embodiment of the present invention.

  A multi-channel audio conversion system according to an embodiment of the present invention can provide a sound field effect similar to a 22.2 channel audio signal using a smaller number of channels than a 22.2 channel audio signal 10. .Converts 2-channel audio signals to other multi-channel audio signals.

  Referring to FIG. 1, the multi-channel audio conversion system includes an output position confirmation unit 110, a signal allocation unit 120, a signal distribution unit 130, and a channel signal calculation unit 140.

  The output position confirmation unit 110 confirms the output position for each channel of the input multichannel audio signal input from the user and the output position for each channel of the output multichannel audio signal generated by converting the input multichannel audio signal. .

  Here, the input multi-channel audio signal may be a 22.2 channel audio signal as shown in FIG. Here, the 22.2 channel audio signal is arranged such that the channel signal output position of each channel is 210, and each channel is set in the structure 220 including the upper layer 221, the middle layer 222, and the lower layer 223. Is done.

  The upper layer 221 includes a channel output from a high position with reference to the user, the middle layer 222 includes a channel output from a height like the user, and the lower layer includes a user as a reference. A channel output at a low position or a subwoofer channel may be included.

  Further, as shown in FIG. 3, the 10.2 channel audio signal according to the present invention sets the output position of seven channels on a plane having a height such as the center of the user, and has a high height with reference to the user. Are set to output positions of three channels, and two subwoofer channels are provided.

  Specifically, the seven channels on the plane are a C (Center) channel in which the output position is arranged at the front center of the user, and L / R (Left) in which the output positions are arranged at ± 30 ° positions in front of the user. / Right) channel, LS / RS (Left Side / Right Side) channel in which the output position is arranged at ± 90 ° position of the user, and LB / RB (Left Back) in which the output position is arranged at ± 150 ° position of the user. / Right Back) channel.

  Also, the three channels having a high height are an LH / RH (Left Height / Right Height) channel in which an output position is arranged at an upper 30 ° to 45 ° position above the L / R channel, and an upper side of the user. A TC (Top Center) channel in which the output position is arranged may be included.

  In the multi-channel audio conversion system, when the input multi-channel audio signal is a 10.2 channel audio signal, 10.1 channel audio signal, 5.1 channel audio signal, 2.0 channel audio signal, etc. A multi-channel audio signal that uses a smaller number of audio output devices than two channels may be used as the output multi-channel audio signal.

  When there is an input channel and an output channel in which the output position of each channel is the same among the output multi-channel audio signal and the input multi-channel audio signal, the signal allocation unit 120 converts the channel signal of the input channel to the output channel. assign.

  As an example, when the output positions of the 22: 2 channel SiL channel and the 10.2 channel LS channel are the same, the signal allocation unit 120 supports the LS channel by allocating the channel signal of the SiL channel to the LS channel. The channel output signal of the SiL channel is reproduced by the audio output device.

ずつ分割して分配する。 The signal distributor 130 assigns the channel signal of the input multichannel audio signal to the two channels of the output multichannel audio signal closest to the channel of the input multichannel audio signal.

Divide and distribute each.

ＴｐＦｃチャネル信号を分配してもよい。 As an example, in the case of a TpFc (Top forward center) channel that is output to an output device located at a high position in the center of the 22: 2 channel, the signal distribution unit 130 is respectively connected to the LH channel and the RH channel at the same height.

The TpFc channel signal may be distributed.

  The channel signal calculation unit 140 calculates a channel-specific signal of the output multi-channel audio signal based on the channel signal assigned to each channel of the output multi-channel audio signal or the distributed channel signal.

  As an example, when converting a 22.2 channel audio signal into a 10.2 channel audio signal, the channel signal calculation unit 140 multiplies a specific constant for each of the upper layer, the middle layer, the lower layer, and the subwoofer channel. Adjust the overall sound level of the output multichannel audio signal.

  When converting the 22.2 channel audio signal to the 10.2 channel audio signal, the process by which the channel signal calculation unit 140 calculates the signal for each channel will be described in detail with reference to FIGS.

  As another example, when the 10.2 channel audio signal is converted to a channel audio signal having fewer than 10.2 channels, the channel signal calculation unit 140 has a channel located on a plane and a height and a subwoofer channel. Alternatively, the overall sound level of the output multichannel audio signal may be adjusted by multiplying each by a specific constant.

  When the 10.2 channel audio signal is converted into an output multi-audio signal using less than 10.2 channels, the process in which the channel signal calculation unit 140 calculates the signal for each channel will be described with reference to FIGS. 12 will be described in detail.

When converting a 22.2 channel audio signal to which a multi-channel audio conversion system according to an embodiment of the present invention is input into a 10.2 channel audio signal, the channel signal calculation unit 140 uses 10. The signal for each channel of the channel is calculated.

  As an example, the channel signal calculation unit 140 includes a FL (Forward Left) channel, an FLc (Forward Left center) channel, and a BtFL (Bottom Forward Left) among 22.2 channel audio signals 410 as shown in Table 1 and FIG. ) Calculate the L channel channel signal of the 10.2 channel output multi-channel audio signal 420 based on the channel signal. Here, the FL channel and the BtFL channel have the same output position as the L channel, and the FLc channel is a channel between the L channel and the C channel.

を乗算した値にそれぞれ中位レイヤと設定された定数ｍを乗算し、下位レイヤであるＢｔＦＬチャネルのチャネル信号に下位レイヤと設定された定数ｂを乗算した後、前記結果値を加えてＬチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 converts the channel signal of the FL channel that is the middle layer and the channel signal of the FLc channel.

Is multiplied by a constant m set for the middle layer and the channel signal of the lower layer BtFL channel is multiplied by a constant b set for the lower layer, and the result value is added to the L channel. The final channel signal of is calculated.

  In addition, since the output position of the R channel is bilaterally symmetric with the L channel, the channel signal calculation unit 140 includes an FR (Forward Right) channel, which is a channel in which the output position is symmetric with the channel used for the L channel, The channel signal of the R channel is calculated using the channel signal of the FRc (Forward Right center) channel and the BtFR (Bottom Forward Right) channel.

  As another example, as shown in Table 1 and FIG. 5, the channel signal calculation unit 140 includes an FC (Forward Center) channel, an FLc channel, an FRc channel, and a BtFC (Bottom Forward Center) among 22.2 channel audio signals 510. Based on the channel signal of the channel, the C channel signal of the 10.2 channel output multi-channel audio signal 520 is calculated. Here, the FC channel and the BtFC channel have the same output position as the C channel, the FLc channel is a channel between the L channel and the C channel, and the FRc channel is a channel between the R channel and the C channel. .

を乗算した値、ＦＲｃチャネルのチャネル信号に

を乗算した値にそれぞれ中位レイヤと設定された定数ｍを乗算し、下位レイヤであるＢｔＦＣチャネルに下位レイヤと設定された定数ｂを乗算した後、前記結果値を加えてＣチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 converts the channel signal of the FC layer that is the middle layer and the channel signal of the FLc channel.

Multiplied by the channel signal of the FRc channel

Are multiplied by a constant m set for the middle layer and the BtFC channel which is the lower layer, respectively, and a constant b set for the lower layer is added to the lower layer, and the result value is added to obtain the final channel of the C channel. Calculate the signal.

を乗算した値にそれぞれ上位レイヤと設定された定数ｔを乗算した後、前記結果値を加えてＬＨチャネルの最終チャネル信号を算出する。 As another example, as shown in Table 1 and FIG. 6, the channel signal calculation unit 140 converts TpFL (top forward left) channel signals and TpFC (top forward center) channel signals out of 22.2 channel audio signals 610. Based on this, the LH channel signal of the 10.2 channel output multichannel audio signal 620 is calculated. Here, the channel signal of the TpFL channel is a channel having the same output position as the LH channel, and the TpFC channel is a channel between the LH channel and the RH channel. Specifically, the channel signal calculation unit 140 converts the channel signal of the TpFL channel and the channel signal of the TpFC channel that are upper layers.

Is multiplied by a constant t set for the upper layer, and the result value is added to calculate the final channel signal of the LH channel.

  Further, since the output position of the RH channel is bilaterally symmetric with the L channel, the channel signal calculation unit 140 is a TpFR (top forward right) channel that is a symmetric channel with the channel used for the LH channel. The channel signal of the RH channel may be calculated using the channel signal of the TpFC channel.

  As another example, as shown in Table 1 and FIG. 7, the channel signal calculation unit 140 is based on the TpSiL channel of the 22.2 channel audio signal 710 and the channel signal of the SiL channel. The channel signal of the LS channel of the audio signal 720 is calculated. Here, the TpSiL channel and the SiL channel are channels having the same output position as the LS channel.

  Specifically, the channel signal calculation unit 140 multiplies the channel signal of the SiL channel that is the middle layer by the constant m set as the middle layer, and is set as the upper layer to the channel signal of the TpSiL channel that is the upper layer. Then, the final value of the LS channel is calculated by adding the result value.

  Further, since the output position of the RS channel is bilaterally symmetric with the LS channel, the channel signal calculation unit 140 includes a channel used for the LS channel and a TpSiR channel that is symmetric with respect to the output position, and a channel of the SiR channel. The channel signal of the RS channel may be calculated using the signal.

  As another example, as shown in Table 1 and FIG. 8, the channel signal calculation unit 140 includes a TpBL (TopBackwardLeft) channel, a TpBC (TopBackwardCenter) channel, a BC (BackwardCenter) channel, and a BL, among 22.2 channel audio signals 810. Based on the (BackwordLeft) channel signal, the LB channel signal of the 10.2 channel output multichannel audio signal 820 is calculated. Here, the TpBL channel and the BL channel are channels having the same output position as the LB channel, and the TpBC channel and the BC channel are channels between the LB channel and the RB channel.

を乗算した値にそれぞれ中位レイヤと設定された定数ｍを乗算し、上位レイヤであるＴｐＢＬチャネルのチャネル信号とＴｐＢＣチャネルのチャネル信号に

を乗算した値にそれぞれ上位レイヤと設定された定数ｔを乗算した後、前記結果値を加えてＬＢチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 converts the channel signal of the middle layer, the BL channel, and the BC channel.

Is multiplied by a constant m set for the middle layer, and the channel signal of the TpBL channel and the channel signal of the TpBC channel, which are upper layers, are multiplied.

Is multiplied by a constant t set with the upper layer, and the result value is added to calculate the final channel signal of the LB channel.

  Further, since the output position of the RB channel is bilaterally symmetric with the L channel, the channel signal calculation unit 140 includes a TpBR (TopBackwardRight) channel, a TpBC (TpBC (Right) channel) among the channels symmetric with the output position of the channel used for the LB channel. The channel signal of the RB channel may be calculated by using the channel signal of the TopBackwardCenter (BC) channel, the BC (BackwardCenter) channel, and the BR (BackwardRight) channel.

When converting a 10.2 channel audio signal to which a multi-channel audio conversion system according to an embodiment of the present invention is input into a 7.1 channel audio signal, the channel signal calculation unit 140 uses the table 2 to set 7.1. The signal for each channel of the channel is calculated.

  As an example, the channel signal calculation unit 140, as shown in Table 1 and FIG. 9, can select the L channel of the 7.1 channel audio signal 920 based on the L channel and LH channel channel signals from the 10.2 channel audio signal 910. The channel signal is calculated. Here, the L channel and the LH channel of the 10.2 channel audio signal 910 have the same output position as the L channel of the 7.1 channel audio signal 920. Further, the channel signal calculation unit 140 may set a constant a for a channel located on a plane and set a constant c for a channel having a height.

  Specifically, the channel signal calculation unit 140 multiplies the L channel of the 10.2 channel audio signal 910 of the channel located on the same plane as the user by a preset constant a, and is an LH channel having a height. After multiplying the channel by a preset constant c, the result value is added to calculate the L channel final channel signal of the 7.1 channel audio signal 920.

  Also, since the output position of the R channel is symmetric with respect to the L channel, the channel signal calculation unit 140 generates a 10.2 channel audio signal 910 that is symmetric with respect to the channel used for the L channel and the output position. The R channel channel signal of the 7.1 channel audio signal 420 may be calculated using the R channel and RH channel channel signals.

  As another example, as shown in Table 1 and FIG. 10, the channel signal calculation unit 140 generates a 7.1 channel audio signal 1020 based on the LB channel and TC channel channel signals of the 10.2 channel audio signal 1010. The channel signal of the LB channel is calculated. Here, the LB channel of the 10.2 channel audio signal 920 has the same output position as the LB channel of the 7.1 channel audio signal 1020, and the TC channel is the LB channel and RB channel of the 7.1 channel audio signal 1020. It is a channel in between.

を乗算した値に予め設定された定数ｃを乗算した後、前記結果値を加えて７．１チャネルオーディオ信号４２０のＬＢチャネルの最終チャネル信号を算出する。 Specifically, the channel signal calculation unit 140 is a channel having a height by multiplying the LB channel of the 10.2 channel audio signal 910 that is a channel located on the same plane as the user by a preset constant a. TC channel channel signal, which is a channel between LB channel and RB channel

Is multiplied by a preset constant c, and the result value is added to calculate the final channel signal of the LB channel of the 7.1-channel audio signal 420.

  In addition, since the output position of the RB channel is bilaterally symmetrical with the LB channel, the channel signal calculation unit 140 outputs the 10.2 channel audio signal 910 that is a channel whose output position is symmetrical with the channel used for the LB channel. The channel signal of the RB channel of the 7.1 channel audio signal 420 may be calculated using the channel signals of the RB channel and the TC channel.

When the 10.2 channel audio signal input to the multi-channel audio conversion system according to an embodiment of the present invention is converted to a 5.1 channel audio signal, the channel signal calculation unit 140 uses the table 3 to calculate the 5.1 channel. The signal for each channel is calculated.

  As an example, the channel signal calculation unit 140 generates a 7.1-channel audio signal 1120 based on the LS channel, LB channel, and TC channel channel signals out of the 10.2 channel audio signal 1110 as shown in Table 1 and FIG. The channel signal of the LS channel is calculated. Here, the TC channel of the 10.2 channel audio signal 1110 is a channel located between the LS channel and the RS channel of the 7.1 channel audio signal 920.

を乗算した値に予め設定された定数ｃを乗算した後、前記結果値を加えて７．１チャネルオーディオ信号４２０のＬＳチャネルの最終チャネル信号を算出する。ここで、１０．２チャネルのＬＳチャネルは５．１チャネルのＬチャネルとＬＳチャネルの中間に位置しているが、１０．２チャネルのＬＳチャネルは後面と判断されるサイドチャネルであるため、チャネル信号算出部１４０は１０．２チャネルのＬＳチャネルをＬチャネルに分配せず、５．１チャネルの後面に位置するＬＳチャネルにのみ印加してもよい。 Specifically, the channel signal calculation unit 140 multiplies the LS channel and the LB channel of the 10.2 channel audio signal 910 of the channel located on the same plane as the user by a constant a set in advance, and has a height. There is a channel signal of TC channel which is a channel between LS channel and RS channel

Is multiplied by a preset constant c, and the result value is added to calculate the final channel signal of the LS channel of the 7.1-channel audio signal 420. Here, the 10.2 channel LS channel is located between the 5.1 channel L channel and the LS channel, but the 10.2 channel LS channel is a side channel that is determined to be the rear surface. The signal calculation unit 140 may not apply the 10.2 LS channel to the L channel, but may apply the LS channel only to the LS channel located on the rear surface of the 5.1 channel.

  Further, since the output position of the RS channel is symmetric with respect to the LS channel, the channel signal calculation unit 140 is configured to output a 10.2 channel audio signal 1110 that is symmetric with respect to the channel used for the LB channel. The channel signal of the RS channel of the 7.1 channel audio signal 420 may be calculated using the channel signals of the RS channel, the RB channel, and the TC channel.

When the 10.2-channel audio signal input to the multi-channel audio conversion system according to an embodiment of the present invention is converted into a 2.0-channel audio signal, the channel signal calculation unit 140 uses the table 4 to specify 2.0. The signal for each channel of the channel is calculated.

  As an example, the channel signal calculation unit 140 converts L channel, C channel, LH channel, LS channel, LB channel, and TC channel channel signals out of the 10.2 channel audio signal 1110 as shown in Table 1 and FIG. Based on this, the channel signal of the L channel of the 7.1 channel audio signal 1120 is calculated. Here, the channel signal calculation unit 140 outputs the channel signal so that the magnitude of the output in which the sound of the rear channel is mapped forward is smaller than the magnitude of the output in which the sound of the front channel is mapped forward. calculate.

  FIG. 13 is a flowchart illustrating a multi-channel audio conversion method according to an embodiment of the present invention.

  In step S1310, the output position confirmation unit 110 confirms the output positions of the output multichannel audio signal and the input multichannel audio signal for each channel.

  In step S1320, the output position confirmation unit 110 confirms whether there is a channel having the same output position for each channel among the output multichannel audio signal and the input multichannel audio signal. Here, an input multi-audio signal channel having the same output position for each channel is referred to as an input channel, and an output multi-audio signal channel having the same output position for each channel is referred to as an output channel. If there is no channel having the same output position for each channel between the output multi-channel audio signal and the input multi-channel audio signal, the signal allocation unit 120 allocates the channel signal of the input channel to the channel at the same position in step S1330. Also good. That is, if there are an input channel and an output channel among the output multichannel audio signal and the input multichannel audio signal, the signal allocation unit 120 allocates the channel signal of the input channel to the output channel in step S1330. On the other hand, if there is no channel whose output position for each channel is the same between the output multi-channel audio signal and the input multi-channel audio signal, in step S1340, the signal distributor 130 is closest to the channel of the input multi-channel audio signal. Check two channels of the output multi-channel audio signal.

  In step S1350, the signal distributor 130 distributes the channel signal of the input multi-channel audio signal to the adjacent channel confirmed in step S1340.

  In step S1360, channel signal calculation section 140 calculates the output of the output audio signal for each channel based on the channel signal assigned in step S1330 or the channel signal distributed in step S1350.

  Specifically, the channel signal calculation unit 140 calculates the output of the output audio signal for each channel using Tables 1 to 4.

  The present invention converts 10.2 channel audio signals, which can provide a sound field similar to 22.2 channels, using less than 22.2 channel speakers to other multi-channel audio signals. The compatibility of two-channel audio signals can be increased.

  As described above, the present invention has been described with reference to the limited embodiments and drawings. However, the present invention is not limited to the above-described embodiments, and any person having ordinary knowledge in the field to which the present invention belongs can be used. Various modifications and variations are possible from such description.

  Therefore, the scope of the present invention is not limited to the described embodiments, but is defined by the claims and the equivalents of the claims.

110: Channel position confirmation unit 120: Signal allocation unit 130: Signal distribution unit 140: Channel signal calculation unit

Claims (16)

An output position confirmation unit for confirming the output position of each channel of the output multichannel audio signal and the input multichannel audio signal;
Of the output multi-channel audio signal and the input multi-channel audio signal, when there is an input channel and an output channel with the same channel output position for each channel, a signal allocating unit that allocates the channel signal of the input channel to the output channel;
A signal distributor for distributing the channel signal of the input multi-channel audio signal to two channels of the output multi-channel audio signal closest to the channel of the input multi-channel audio signal;
A channel signal assigned to each channel of the output multichannel audio signal, or a channel signal calculation unit that calculates a signal for each channel of the output multichannel audio signal based on the distributed channel signal;
A multi-channel audio conversion system comprising:   The multi-channel audio conversion system according to claim 1, wherein one of the output multi-channel audio signal and the input multi-channel audio signal is a 10.2 channel audio signal.   In the 10.2 channel audio signal, seven channel output positions are set on a plane centering on the user, three channel output positions having a height with respect to the user are set, and two subwoofers are set. The multi-channel audio conversion system according to claim 2, wherein a channel is provided.   The seven channels on the plane of the 10.2 channel audio signal are the C (Center) channel in which the output position is arranged in the front center of the user, and the L in which the output positions are arranged at ± 30 ° positions in front of the user. / R (Left / Right) channel, LS / RS (Left Side / Right Side) channel in which the output position is arranged at the position of ± 90 ° of the user, and LB / in which the output position is arranged at the position of ± 150 ° of the user 4. The multi-channel audio conversion system according to claim 3, further comprising an RB (Left Back / Right Back) channel.   The three channels having the height of the 10.2 channel audio signal are an LH / RH (Left Height / Right Height) channel in which an output position is disposed at a position of 30 ° to 45 ° above the L / R channel. 5. The multi-channel audio conversion system according to claim 4, further comprising a TC (Top Center) channel in which an output position is arranged above the user.   When the input multichannel audio signal is a 22.2 channel audio signal, the channel signal calculation unit multiplies a specific constant for each of the upper layer, the middle layer, the lower layer, and the subwoofer channel to output an output multichannel. The multi-channel audio conversion system according to claim 2, wherein the overall sound level of the audio signal is adjusted.   When the input multi-channel audio signal is a 10.2 channel audio signal, the channel signal calculation unit multiplies a specific constant for each channel located on the plane, each channel having the height, and each subwoofer channel. 4. The multi-channel audio conversion system according to claim 3, wherein the overall sound level of the output multi-channel audio signal is adjusted. The signal distribution unit distributes the channel signal of the input multi-channel audio signal to two channels of the output multi-channel audio signal closest to the channel of the input multi-channel audio signal.

The multi-channel audio conversion system according to claim 1, wherein the multi-channel audio conversion system is divided and distributed. Checking the output position of each channel of the output multi-channel audio signal and the input multi-channel audio signal;
A step of checking whether there is an input channel and an output channel of the same output position for each channel of the output multi-channel audio signal and the input multi-channel audio signal;
Assigning the channel signal of the input channel to the output channel when there is an input channel and an output channel of the same output position for each channel among the output multi-channel audio signal and the input multi-channel audio signal;
If there is no output multi-channel audio signal and input multi-channel audio signal that have the same output position for each channel, the input multi-channel audio signal is closest to the channel of the input multi-channel audio signal. Distributing a channel signal of the channel audio signal;
Calculating a channel signal assigned to each channel of the output multi-channel audio signal or a signal for each channel of the output multi-channel audio signal based on the distributed channel signal;
A multi-channel audio conversion method comprising:   The multi-channel audio conversion method according to claim 9, wherein one of the output multi-channel audio signal and the input multi-channel audio signal is a 10.2 channel audio signal.   In the 10.2 channel audio signal, seven channel output positions are set on a plane centering on the user, three channel output positions having a height with respect to the user are set, and two subwoofers are set. The method of claim 10, wherein a channel is provided.   The seven channels on the plane of the 10.2 channel audio signal are the C channel in which the output position is arranged at the front center of the user and the L / R channel in which the output positions are arranged at ± 30 ° positions in front of the user. 12. The LS / RS channel having an output position arranged at a position of ± 90 ° of a user and an LB / RB channel having an output position arranged at a position of ± 150 ° of the user. Multi-channel audio conversion method.   The three channels having the height of the 10.2 channel audio signal are divided into an LH / RH channel in which an output position is arranged at 30 ° to 45 ° above the L / R channel, and an output position above the user. The multi-channel audio conversion method according to claim 12, further comprising a TC channel in which is arranged.   When the input multi-channel audio signal is a 22.2 channel audio signal, the step of calculating the signal for each channel multiplies a specific constant for each upper layer, middle layer, lower layer, and subwoofer channel. The multi-channel audio conversion method according to claim 9, wherein the overall sound level of the output multi-channel audio signal is adjusted.   When the input multi-channel audio signal is a 10.2 channel audio signal, the step of calculating the signal for each channel includes a specific constant for each channel located on a plane, each channel having the height, and each subwoofer channel. The multi-channel audio conversion method according to claim 11, wherein the overall sound level of the output multi-channel audio signal is adjusted by multiplying. In the step of distributing the channel signal, the channel signal of the input multi-channel audio signal is distributed to two channels of the output multi-channel audio signal closest to the channel of the input multi-channel audio signal.

The multi-channel audio conversion method according to claim 9, wherein the multi-channel audio conversion method is divided and distributed.

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