| 摘要 |
An acoustic feedback suppression apparatus according to the present invention comprises a notch filter ( 109 ) for filtering out acoustic feedback components, a plurality of first sample fast Fourier transformation means ( 118 to 120 ) for performing frequency analysis of every 512 data samples, a plurality of peak frequency detecting means ( 121 to 123 ) for detecting peak frequencies of respective channels, adding means ( 124 ) for adding signals on the respective channels, second sample fast Fourier transformation means ( 125 ) for performing frequency analysis of every 4096 data samples of the added signal, peak frequency detecting means ( 126 ) for detecting a peak frequency of the output signal outputted from the 4096 fast Fourier transformation means ( 125 ), and coefficient specifying means ( 129 ) for specifying filter coefficients of the notch filter ( 109 ). |
