Audio signal processing circuit

摘要

An audio-signal-processing circuit includes: a noise-detecting unit to detect presence or absence of noise in an audio signal generated based on an output from a tuner configured to receive a broadcast signal; a low-pass filter, having predetermined phase characteristics, to pass the audio signal having a band of frequencies lower than a predetermined frequency; a high-pass filter, having the predetermined phase characteristics, to pass the audio signal having a band of frequencies higher than the predetermined frequency; first- and second-output units to multiply the signals outputted from the low-pass and high-pass filters by first and second coefficients and output the multiplied signals, respectively; an adding unit to add the signals respectively outputted from the first and the second output units; and a coefficient control unit to, when the noise-detecting unit has detected the presence of noise, decrease the second coefficient below the first coefficient.

主权项

1. An audio signal processing circuit comprising:
a noise detecting unit configured to detect presence or absence of noise in an audio signal generated based on an output from a tuner configured to receive a broadcast signal; a low-pass filter, having predetermined phase characteristics, configured to pass the audio signal having a band of frequencies lower than a predetermined frequency; a high-pass filter, having the predetermined phase characteristics, configured to pass the audio signal having a band of frequencies higher than the predetermined frequency; a first output unit configured to multiply the signal outputted from the low-pass filter by a first coefficient and output the multiplied signal; a second output unit configured to multiply the signal outputted from the high-pass filter by a second coefficient and output the multiplied signal; an adding unit configured to add the signals respectively outputted from the first and the second output units; and a coefficient control unit configured to, when the noise detecting unit has detected the presence of noise, decrease the second coefficient below the first coefficient.