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Ambient noise root mean square (RMS) detector

  • US 9,107,010 B2
  • Filed: 02/08/2013
  • Issued: 08/11/2015
  • Est. Priority Date: 02/08/2013
  • Status: Active Grant
First Claim
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1. A root mean square (RMS) detector detecting an RMS level of a background noise input signal while being substantially immune to voice, wind, scratch sounds, and any spike noise, the RMS detector comprising:

  • a raw rms detector receiving a background noise input signal and outputting a raw rms value;

    a minimum rms tracker receiving the raw rms value and tracking a minimum rms value of the raw rms value;

    a normalized distance tracker receiving the minimum rms value and calculating a distance value between the minimum rms value and a previous corrected RMS value;

    a normalized smoothing factor calculator normalizing a smoothing factor by dividing the smoothing factor by a maximum of the distance value or 1; and

    an RMS value calculator determining a corrected RMS value from the minimum rms value, a previous corrected RMS value, and the normalized smoothing factor, and outputting a corrected RMS value.

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