| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an audio signal processing circuit capable of outputting audio signals with high sound quality while removing noise in the audio signals. <P>SOLUTION: An audio signal processing circuit includes: a noise detection unit that detects presence or absence of noise in an audio signal generated on the basis of the output of a tuner that receives broadcast signals; a low-pass filter that has prescribed phase characteristics and passes audio signals of a band lower than a prescribed frequency; a high-pass filter that has prescribed phase characteristics and passes audio signals of a band higher than a prescribed frequency; a first output unit that multiplies the signal output from the low-pass filter by a first coefficient and outputs the resulting signal; a second output unit that multiplies the signal output from the high-pass filter by a second coefficient and outputs the resulting signal; an addition unit that adds the signals output from the first and second output units; a coefficient control unit that reduces the second coefficient so that the second coefficient is smaller than the first coefficient when the noise detection unit detects noise. <P>COPYRIGHT: (C)2013,JPO&INPIT |
