| 摘要 |
PURPOSE:To obtain the device which operates by following the steep variation of the function which expresses the acoustic coupling conditions of a microphone and a noise signal source. CONSTITUTION:The device consists of a voice collecting microphone 1, a noise signal collecting microphone 2, a fixed filter 3 which passes the output of the microphone 1 and approximates the inverse function of a human voice chords function, a fixed filter 4 which passes the output of the microphone 2 and is equivalent to the fixed filter 3, an adaptive filter 5 which passes the output of the fixed filter 4, a subtracting section 7 which outputs the difference between the output of the fixed filter 3 and the output of the adaptive filter 5, an adaptive filter 6 which passes the output of the microphone 2 and is equivalent to the adaptive filter 5 and a subtracting section 8 which outputs the difference between the output of the microphone 1 and the output of the adaptive filter 6. In accordance with the output of the subtracting section 7, the coefficients of the adaptive filters 5 and 6 are adaptively controlled so that the noise signal components of the output becomes small. |
