Transmission device, reception device, and control method thereof

1 . A transmission device comprising:

a communication interface comprising circuitry; and

at least one processor, comprising processing circuitry, individually and/or collectively, is configured to:

among audio signals of a plurality of channels including a left channel, a sub-left channel, a right channel, a sub-right channel, and a woofer channel, separate the audio signals of the sub-left channel and the sub-right channel respectively into a high-pass audio signal and a low-pass audio signal based on a frequency band,

mix the high-pass audio signal of the sub-left channel and the high-pass audio signal of the sub-right channel with the audio signal of the woofer channel to provide respective mixed woofer channels,

mix the low-pass audio signal of the sub-left channel with the audio signal of the left channel, and mix the low-pass audio signal of the sub-right channel with the audio signal of the right channel, and

control the communication interface to transmit the audio signals of the mixed woofer channels, the mixed left channel, and the mixed right channel to a reception device.

2 . The transmission device of claim 1 ,

wherein the processor is configured to:

generate, in providing the mixed woofer channels, an audio signal of a first mixed woofer channel based on signals of the woofer channel and high-pass audio signals of the sub-left channel being mixed, and generate an audio signal of a second mixed woofer channel based on signals of the woofer channel and high-pass audio signals of the sub-right channel being mixed.

3 . The transmission device of claim 2 ,

wherein the processor is configured to:

control the communication interface to transmit the audio signals of four channels including the first mixed woofer channel, the second mixed woofer channel, a mixed left channel resulting from the mix of the low-pass audio signal of the sub-left channel with the audio signal of the left channel, and a mixed right channel resulting from the mix of the low-pass audio signal of the sub-right channel with the audio signal of the right channel, from the audio signals of five channels including the left channel, the sub-left channel, the right channel, the sub-right channel, and the woofer channel, to the reception device.

4 . The transmission device of claim 1 ,

wherein at least one processor, individually and/or collectively, is configured to:

separate the audio signals of the sub-left channel and the sub-right channel based on a specified frequency higher than a cut-off frequency of the woofer channel.

5 . The transmission device of claim 4 ,

wherein the specified frequency is a stop band boundary frequency of the woofer channel.

6 . A method of controlling a transmission device, the method comprising:

among audio signals of a plurality of channels including a left channel, a sub-left channel, a right channel, a sub-right channel, and a woofer channel, separating the audio signals of the sub-left channel and the sub-right channel respectively into a high-pass audio signal and a low-pass audio signal based on a frequency band;

mixing the high-pass audio signal of the sub-left channel and the high-pass audio signal of the sub-right channel with the audio signal of the woofer channel to provide respective mixed woofer channels;

mixing the low-pass audio signal of the sub-left channel with the audio signal of the left channel, and mixing the low-pass audio signal of the sub-right channel with the audio signal of the right channel; and

transmitting the audio signals of the mixed woofer channels, the mixed left channel, and the mixed right channel to a reception device.

7 . The method of claim 6 ,

wherein the mixing to provide the mixed woofer channels comprises:

generating an audio signal of a first mixed woofer channel based on signals of the woofer channel and high-pass audio signals of the sub-left channel being mixed, and generate an audio signal of a second mixed woofer channel based on signals of the woofer channel and high-pass audio signals of the sub-right channel being mixed.

8 . The method of claim 7 ,

wherein the transmitting to the reception device comprises:

transmitting the audio signals of four channels including the first mixed woofer channel, the second mixed woofer channel, a mixed left channel resulting from the mix of the low-pass audio signal of the sub-left channel with the audio signal of the left channel, and a mixed right channel resulting from the mix of the low-pass audio signal of the sub-right channel with the audio signal of the right channel, from the audio signals of five channels including the left channel, the sub-left channel, the right channel, the sub-right channel, and the woofer channel, to the reception device.

9 . The method of claim 6 ,

wherein the separating comprises:

separating the audio signals of the sub-left channel and the sub-right channel based on a specified frequency higher than a cut-off frequency of the woofer channel.

10 . The method of claim 9 ,

wherein the specified frequency is a stop band boundary frequency of the woofer channel.