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Speech encoding and decoding system which modifies encoding and decoding characteristics based on an audio signal
Speech encoding and decoding system which modifies encoding and decoding characteristics based on an audio signal
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机译:语音编码和解码系统,可基于音频信号修改编码和解码特性
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摘要
The present invention relates to a speech encoder/decoder system employing digital transmission in which the encoding and decoding operations are complimentary, and these operations make use of sets of parameters which may be optimized for a speaker and for a particular digital radio link. A number of sets of parameters are determined experimentally, for example, by employing human sample groups in which perceived audio and transmission quality are tested. The encoder/decoder system then employs a group, or number, of sets of parameters serving all speakers rather than employing one fixed set of parameters. The particular set of parameters for a speaker in the encoder of a first transceiver is determined by a processor which receives values based on an analysis of the input audio signal, and then a parameter set identifier is sent within the digital signal for use by a decoder of a second transceiver. In addition, the processor of the first transceiver which receives a signal from the second transceiver may include circuitry which monitors the signal to noise ratio and bit error rate of the channel to provide a second criteria in addition to the received values based on the analysis of the input audio signal for choosing a particular set of parameters for the encoder.
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