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AUDIO SIGNAL PROCESSING CIRCUIT

  • US 20130039505A1
  • Filed: 08/10/2012
  • Published: 02/14/2013
  • Est. Priority Date: 08/10/2011
  • Status: Active Grant
First Claim
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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.

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