| 摘要 |
The invention claims a method and an appropriate acoustic signal processing system for noise reduction of a binaural microphone signal ( x 1 , x 2 ) with one target point source (s) and M interfering point sources (n 1 , n 2 , ...,n M ) as input sources to a left and a right microphone (2) of a binaural microphone system, comprising the step of:
- filtering a left and a right microphone signal ( x 1 , x 2 ) by a Wiener filter (14) to obtain binaural output signals ( s L , s R ) of the target point source (s), where said Wiener filter (14) is calculated as H W = 1 - ¦ x 1 , n + x 2 , n �¢ x 1 , n + x 2 , n ¦ x 1 + x 2 �¢ x 1 + x 2 ,
where H w is said Wiener filter (14), ¦( x 1, n + x 2, n )( x 1,n+ x 2, n ) is the auto power spectral density of the sum of all the M interfering point sources components (x1,n, x2,n) contained in the left and right microphone signal (x1, x2) and ¦( x 1 + x 2 )( x 1 + x 2 ) is the auto power spectral density of
the sum of the left and right microphone signal (x1, x2). Owing to the linear-phase property of the calculated Wiener filter (14), original binaural cues are perfectly preserved not only for the target source (s) but also for the residual interfering sources (n 1 , n 2 , ... n M ) .
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