| 摘要 |
PROBLEM TO BE SOLVED: To provide an audio extraction device which effectively extracts external audio during a simultaneous conversation state. SOLUTION: The audio extraction device includes: first adaptive filters 111 and 114 and second adaptive filters 112 and 115 which set and update a filter coefficient simulating a transmission system from a loudspeaker to a microphone; a subtractor 12 and a subtractor 13 which extract a first residual signal and a second residual signal which are differences between simulation signals obtained by performing a calculation processing on an input audio signal input to the loudspeaker using the first and second adaptive filters, and a microphone input audio signal; a cancel amount comparator 16 which monitors a difference amount between the microphone input audio signal and the first residual signal in the subtractor 12, and a difference amount between the microphone input audio signal and the second residual signal in the subtractor 13; and an extraction signal sender which sends out the residual signal having the larger difference amount. COPYRIGHT: (C)2011,JPO&INPIT |
