Method and arrangement for controlling smoothing of stationary background noise
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorStefan Bruhn
Life of this patent
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Abstract
In a method of smoothing stationary background noise in a telecommunication speech session, initially receiving and decoding S10 a signal representative of a speech session, where the signal comprises both a speech component and a background noise component. Subsequently, providing S20 a noisiness measure for the signal, and adaptively S30 smoothing the background noise component based on the provided noisiness measure.
Claims22
A method of smoothing stationary background noise in a telecommunication speech session, comprising:
- receiving and decoding a signal representative of a speech session, said signal comprising both a speech component and a background noise component, providing a noisiness measure for said signal, said noisiness measure being indicative of the predictability of the signal, said predictability being defined in terms of a Linear Predictive Coder (LPC) prediction gain of said signal;
- and
- adaptively smoothing said background noise component based on said provided noisiness measure, wherein said smoothing operation is indirectly controlled by said noisiness measure based on a smoothing control parameter that follows a detected increase of said noisiness measure gradually, and follows a detected reduction of said noisiness measure immediately.
A controller for background smoothing in a telecommunication system, comprising:
- a receiver and decoder unit configured for receiving and decoding a signal representative of a speech session, said signal comprising both a speech component and a background noise component;
- a noisiness measuring unit configured for providing a noisiness measure for said signal, said noisiness measure being indicative of the predictability of the signal;
- said predictability being defined in terms of a Linear Predictive Coder (LPC) prediction gain of said signal;
- and
- a background smoothing unit configured for adaptively smoothing said background noise component based on said provided noisiness measure, wherein said background smoothing unit is adapted to be indirectly controlled by said noisiness measure based on a smoothing control parameter that follows a detected increase of said noisiness measure gradually, and follows a detected reduction of said noisiness measure immediately.
A decoder in a telecommunication system, comprising:
- a receiver and decoder unit configured for receiving and decoding a signal representative of a speech session, said signal comprising both a speech component and a background noise component;
- a noisiness measuring unit configured for providing a noisiness measure for said signal, said noisiness measure being indicative of the predictability of the signal said predictability being defined in terms of a Linear Predictive Coder (LPC) prediction gain of said signal;
- and
- a background smoothing unit configured for adaptively smoothing said background noise component based on said provided noisiness measure, wherein said background smoothing unit is adapted to be indirectly controlled by said noisiness measure based on a smoothing control parameter that follows a detected increase of said noisiness measure gradually, and follows a detected reduction of said noisiness measure immediately.
An encoder in a telecommunication system, comprising:
- a transmitting unit configured for encoding and transmitting a signal representative of a speech session to a user terminal, said signal comprising both a speech component and a background noise component;
- a noisiness measuring unit configured for determining a noisiness measure for said transmitted signal, said noisiness measure being indicative of the predictability of the signal, said predictability being defined in terms of a Linear Predictive Coder (LPC) prediction gain of said signal;
- a noisiness measure provider configured for providing said determined noisiness measure at said user terminal.
Dependencies are inferred from the claim text.