Patent ID: 8989407
Filing Date: 2015-03-24
Classification: H04S

Abstract:
1. A signal processing apparatus comprising: an input unit that inputs a plurality of channels of audio data; a detection unit that detects a number of channels of the audio data input by the input unit; a receiving unit that receives an instruction for setting volume of sound by a listener; a driving unit that controls output of sound by a plurality of speakers; a determining unit that determines a number of output channels according to the volume set by the instruction received by the receiving unit, wherein if the set volume is lower than a threshold value, the determining unit determines that a number less than a number of channels corresponding to an arrangement of the plurality of speakers as the number of output channels; a processing unit that processes the input audio data in accordance with the number of channels of the input audio data detected by the detection unit and the number of output channels determined by the determining unit, wherein the processing unit generates, from the input audio data, audio data for outputting of a number of channels corresponding to the determined number of output channels, if the audio data of the number of channels same as the number of channels corresponding to the arrangement of the plurality of speakers is inputted by the input unit and if the number of output channels determined by the determining unit is less than the number of channels of the input audio data detected by the detection unit; a control unit that controls the driving unit in accordance with the number of output channels determined by the determining unit and the set volume, wherein the control unit selects speakers for outputting sound corresponding to the audio data for outputting from among the plurality of speakers in accordance with the number of output channels determined by the determining unit and controls the driving unit such that the selected speakers output the sound corresponding to the audio data for outputting and a speaker other than the selected speakers is stopped from outputting sound, and wherein the control unit controls the driving unit such that volume of the sound, which is outputted by the selected speakers and corresponds to the audio data of the number of output channels for outputting, is changed in accordance with the set volume.