Patent ID: 8238547
Filing Date: 2012-08-07
Classification: G10L,H04R

Abstract:
1. A sound pickup apparatus comprising: a plurality of microphones arranged based on a predetermined arrangement condition; a microphone selection section for selecting one or more of a plurality of the microphones; an echo cancellation processing section for performing echo cancellation processing for each microphone for a sound signal detected by the selected microphone; an echo cancellation calibration sound generation section; a speaker outputting a calibration sound from the echo cancellation calibration sound generation section, and an echo cancellation processing control section for driving the echo cancellation calibration sound generation section to generate an echo cancellation calibration sound, excluding an echo, and to output the echo calibration sound from the speaker and selecting one or more of the plurality of microphones detecting sounds including the echo cancellation calibration sound outputted from the speaker via the microphone selection section in a learning mode of the echo cancellation processing section, and generating or updating an echo cancellation use parameter by learning for the selected microphone in the echo cancellation processing section, thereby obtaining the echo cancellation use parameter for preforming echo cancellation, wherein a flag indicating a state of the echo cancellation use parameter for each microphone of said plurality of microphones is read, and when the flag indicates that the echo cancellation use parameter for each of said plurality of microphones is obtained, the learning mode of the echo cancellation processing section is bypassed, and wherein the echo cancellation calibration sound is an audible sound having a predetermined frequency band and various types of amplitudes of a sound level.