Encoder and method for encoding an audio signal with reduced background noise using linear predictive coding
First Claim
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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Abstract
It is shown an encoder for encoding an audio signal with reduced background noise using linear predictive coding. The encoder includes a background noise estimator configured to estimate background noise of the audio signal, a background noise reducer configured to generate background noise reduced audio signal by subtracting the estimated background noise of the audio signal from the audio signal, and a predictor configured to subject the audio signal to linear prediction analysis to obtain a first set of linear prediction filter (LPC) coefficients and to subject the background noise reduced audio signal to linear prediction analysis to obtain a second set of linear prediction filter (LPC) coefficients. Furthermore, the encoder includes an analysis filter composed of a cascade of time-domain filters controlled by the obtained first set of LPC coefficients and the obtained second set of LPC coefficients.
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Citations
13 Claims
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1. Encoder for encoding an audio signal with reduced background noise using linear predictive coding, the encoder comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. System comprising:
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an encoder for encoding an audio signal with reduced background noise using linear predictive coding, said 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; a decoder configured to decode the encoded audio signal, wherein each of the encoder and the decoder 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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12. Method for encoding an audio signal with reduced background noise using linear predictive coding, the method comprising:
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estimating a representation of background noise of the audio signal; generating 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; subjecting the representation of the audio signal to linear prediction analysis to acquire a first set of linear prediction filter (LPC) coefficients and subjecting 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 controlling a cascade of time domain filters 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.
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13. Non-transitory digital storage medium having a computer program stored thereon to perform a method for encoding an audio signal with reduced background noise using linear predictive coding, said method comprising:
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estimating a representation of background noise of the audio signal; generating 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; subjecting the representation of the audio signal to linear prediction analysis to acquire a first set of linear prediction filter (LPC) coefficients and subjecting 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 controlling a cascade of time domain filters 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, when said computer program is run by a computer.
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Specification