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2. 发明授权

US5579433A Digital coding of speech signals using analysis filtering and synthesis filtering 失效
标题翻译：使用分析滤波和合成滤波对语音信号进行数字编码
公开(公告)号：US5579433A
公开(公告)日：1996-11-26
申请号：US60427
申请日：1993-05-07
申请人： Kari J. Jarvinen
发明人： Kari J. Jarvinen
IPC分类号： G10L19/08 , H03M20060101 , G10L3/02 , G10L5/00 , G10L7/00 , G10L9/00
CPC分类号： G10L19/08
摘要： A digital speech encoder is constructed to include a short term analyzer for forming a set of prediction parameters a(i), corresponding to an input speech signal, and an encoder for producing an excitation signal. The encoder includes a plurality of serially coupled coding blocks, wherein each coding block includes an analysis filter, a sample selection block, and a synthesizer filter. The analysis filter outputs speech signal sample values to the sample selection block, which selects and outputs K.sub.i sample values representing a selected partial excitation signal. The synthesis filter synthesizes a speech signal corresponding to the selected partial excitation signal output by the selection block and outputs a partial excitation synthesis result to an output of the coding block. At the output of each coding block is a subtractor arranged for subtracting a partial excitation synthesis result that is output from the coding block from the speech signal to obtain a difference signal. The difference signal is coupled to the input of an analysis filter of a next serially coupled coding block. A quantizer is also provided for forming the excitation signal in accordance with all of the partial excitation signals generated by the coding blocks.
摘要翻译：数字语音编码器被构造成包括用于形成对应于输入语音信号的一组预测参数a（i）的短期分析器和用于产生激励信号的编码器。编码器包括多个串行编码块，其中每个编码块包括分析滤波器，采样选择块和合成器滤波器。分析滤波器将语音信号采样值输出到采样选择块，其选择并输出表示所选择的部分激励信号的Ki采样值。合成滤波器合成对应于由选择块输出的所选择的部分激励信号的语音信号，并将部分激励合成结果输出到编码块的输出。在每个编码块的输出端是减法器，被设置为从语音信号中减去从编码块输出的部分激励合成结果以获得差分信号。差分信号耦合到下一个串行编码块的分析滤波器的输入端。还提供量化器，用于根据由编码块产生的所有部分激励信号形成激励信号。

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