Patent ID: 8068620

Claim:
A signal processing apparatus comprising: a plurality of sound collecting elements; a noise detector configured to detect a level of noise included in a low-frequency band of a plurality of audio signals output from the plurality of sound collecting elements; a noise reduction unit configured to reduce the noise included in the plurality of audio signals output from the plurality of sound collecting elements in accordance with a signal output from the noise detector; a converter configured to convert the plurality of audio signals output from the noise reduction unit into pieces of audio data corresponding to a plurality of channels including a low-frequency channel and other channels; a low-frequency channel controller configured to control a level of the audio data corresponding to the low-frequency channel in accordance with the level of the noise detected using the noise detector; and a level controller configured to control the level of the audio data of the low-frequency channel output from the low-frequency channel controller and levels of the pieces of audio data corresponding to the other channels output from the converter.