| 摘要 |
PROBLEM TO BE SOLVED: To remove a noise (music) from a car audio device mixing into a voice inputting microphone by estimating a noise (music) signal mixing into the voice inputting microphone based on an audio signal outputted from the car audio device and subtracting the noise (music) signal from a detection signal from the voice inputting microphone. SOLUTION: The audio signal from the car audio device 10 is band limited by a first filter means 30, and is converted to a digital signal by a first A/D conversion means 40 to be inputted to an adaptive filter part 51 and a coefficient updating part 52. The audio signal (d) converted into the digital signal is processed by the adaptive filter part 51 to be outputted to a difference means 53 as an estimated noise (music) signal (y). The difference means 53 outputs a difference between a microphone detection signal (x) outputted from a second A/D conversion means 80 and the estimated noise (music) signal (y) from the adaptive filter part 51 to the coefficient updating part 52 and a voice recognition part 90 as an error signal (e). |
