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Method and system for low bit rate speech coding with speech recognition features and pitch providing reconstruction of the spectral envelope
Method and system for low bit rate speech coding with speech recognition features and pitch providing reconstruction of the spectral envelope
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机译:具有语音识别特征和音调的低比特率语音编码的方法和系统,可重构频谱包络
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摘要
A method for encoding a digitized speech signal so as to generate data capable of being decoded as speech. A digitized speech signal is first converted to a series of feature vectors using for example known Mel-frequency Cepstral coefficients (MFCC) techniques. At successive instances instance of time a respective pitch value of the digitized speech signal is computed, and successive acoustic vectors each containing the respective pitch value and feature vector are compressed so as to derive therefrom a bit stream. A suitable decoder reverses the operation so as to extract the features vectors and pitch values, thus allowing speech reproduction and playback. In addition, speech recognition is possible using the decompressed feature vectors, with no impairment of the recognition accuracy and no computational overhead.
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