Method and arrangement for controlling smoothing of stationary background noise
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorStefan Bruhn
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Abstract
In a method for coding of information for enhancing a background noise representation, voice activity of an input speech signal is determined. A noisiness parameter is determined for an inactive speech signal, wherein the noisiness parameter is based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders. The noisiness parameter is quantized, and the quantized noisiness parameter is encoded for transmission.
Claims30
A method for coding of information for enhancing a background noise representation, the method comprising:
- determining voice activity of an input speech signal;
- determining a noisiness parameter for an inactive speech signal, wherein said noisiness parameter is based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders;
- quantizing the noisiness parameter;
- and
- encoding the quantized noisiness parameter for transmission.
A speech encoder, comprising:
- processing circuitry configured to determine voice activity of an input speech signal;
- the processing circuitry configured to determine a noisiness parameter for an inactive speech signal, wherein said noisiness parameter is based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders;
- the processing circuitry configured to quantize the noisiness parameter;
- and
- the processing circuitry configured to encode the speech signal for transmission.
An anti-swirling method for coded background noise, the method comprising:
- receiving and decoding a coded speech signal;
- obtaining a voice activity indication and a noisiness parameter for said speech signal, wherein said noisiness parameter is based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders;
- and
- adaptively smoothing background noise of said decoded speech signal based on said obtained noisiness parameter, wherein said smoothing operation is indirectly controlled by said noisiness parameter.
A speech decoder, comprising:
- processing circuitry configured to receive and decode a coded speech signal;
- the processing circuitry further configured to obtain a voice activity indication and a noisiness parameter for said speech signal, said noisiness parameter being based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders;
- and
- the processing circuitry further configured to adaptively smooth background noise of said decoded speech signal based on said obtained noisiness parameter, wherein said processing circuitry is adapted to be indirectly controlled by said noisiness parameter.
Dependencies are inferred from the claim text.