Controlling a weighting filter based on the spectral content of a speech signal
AssigneeMindspeed Technologies, Inc.
InventorsYang Gao, Huan-Yu Su
Life of this patent
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Abstract
A method for preparing a speech signal for encoding comprises determining whether the spectral content of an input speech signal is representative of a defined spectral characteristic (e.g., a defined characteristic slope). A frequency specific filter component of a weighting filter is controlled based on the determination of the spectral content of the speech signal or/and its location in the encoder. A core weighting filter component of the weighting filter may be maintained regardless of the spectral content of the speech signal.
Claims29
A method for preparing a speech signal for encoding, the method comprising:
- providing a pitch pre-processing weighting filter including a core weighting filter component and a low-pass filter;
- providing a fixed-codebook weighting filter including the core weighting filter component and a high-pass filter;
- providing an adaptive-codebook weighting filter including the core weighting filter component;
- determining whether a spectral content of the speech signal is representative of a defined spectral characteristic;
- controlling said low-pass filter and said high-pass filter based on a determination of the spectral content of the speech signal.
An encoder for encoding a speech signal, the encoder comprising:
- a pitch pre-processing weighting filter including a core weighting filter component and a low-pass filter;
- a fixed-codebook weighting filter including the core weighting filter component and a high-pass filter;
- an adaptive-codebook weighting filter the core weighting filter component;
- a spectral detector for determining whether a spectral content of the speech signal is representative of a defined spectral characteristic;
- a controller adapted to control said low-pass filter and said high-pass filter based on a determination of the spectral content of the speech signal.
Dependencies are inferred from the claim text.