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Encoder and method for encoding an audio signal with reduced background noise using linear predictive coding

  • US 10,692,510 B2
  • Filed: 03/14/2018
  • Issued: 06/23/2020
  • Est. Priority Date: 09/25/2015
  • Status: Active Grant
First Claim
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1. Encoder for encoding an audio signal with reduced background noise using linear predictive coding, the encoder comprising:

  • a background noise estimator configured to estimate a representation of background noise of the audio signal;

    a background noise reducer configured to generate a representation of a background noise reduced audio signal by subtracting the estimated representation of the background noise of the audio signal from a representation of the audio signal;

    a predictor configured to subject the representation of the audio signal to linear prediction analysis to acquire a first set of linear prediction filter (LPC) coefficients and to subject the representation of the background noise reduced audio signal to linear prediction analysis to acquire a second set of linear prediction filter (LPC) coefficients; and

    an analysis filter composed of a cascade of time-domain filters controlled by the acquired first set of LPC coefficients and the acquired second set of LPC coefficients to acquire a residual signal from the audio signal;

    wherein the encoder is implemented using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.

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