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Speech coding and decoding apparatus including a non-speech encoding, a recording medium recording the decoding method and program
Speech coding and decoding apparatus including a non-speech encoding, a recording medium recording the decoding method and program
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机译:包括非语音编码的语音编码和解码设备,记录该解码方法和程序的记录介质
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摘要
A speech decoding device of the invention smoothes, in decoding speech signal in a voice-less period, RMS and filter coefficients which is discontinuously transmitted, and provides them to a synthesis filter. Thereby, it is capable of preventing discontinuous changing of the filter coefficient caused by the intermittent transmission of the filter coefficient. As a result, a quality of decoding can be improved. Also, to remove an effect, caused by the smoothing process, from the filter coefficients or the RMS which are transmitted in the past frames, a smoothing factor is adjusted not to perform smoothing while a certain time period (or a certain number of frames) from when a transition is made from a voice period from a voice-less period, or when a decoded feature parameter satisfies a predetermined condition. IMAGE
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