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Method and device for encoding wideband speech, allowing in particular an improvement in the quality of the voiced speech frames
Method and device for encoding wideband speech, allowing in particular an improvement in the quality of the voiced speech frames
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机译:用于对宽带语音进行编码的方法和设备,特别是可以提高浊音语音帧的质量
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摘要
A method for encoding speech includes sampling speech to obtain successive voice frames each having a predetermined number of samples, and determining parameters of a linear prediction model for each voice frame. The parameters include a long-term excitation word extracted from an adaptive coded directory using a first linear prediction filter and an associated long-term gain. The parameters further include a short-term excitation word extracted from a fixed coded directory and an associated short-term gain. The adaptive coded directory is updated based upon the extracted long-term excitation word and the extracted short-term excitation word. The first linear prediction filter is updated using the short-term excitation word filtered by a second filter. The second filter has an order greater than or equal to 1 and coefficients thereof depend on the long-term gain for reducing a short-term excitation contribution when a long-term excitation gain is greater than a threshold.
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