Application and implementation of an embedded subband coder

An embedded subband speech coder with dynamic bit allocation and postfiltering is described. The coder has been implemented on an AT&T WE DSP32 digital signal processor in real time, and the performance of the coder in a statistical multiplexer environment has been simulated. A technique for eliminating low-rate tandem encodings in a digital network is also described. These techniques are shown to yield improved end-to-end performance in environments with multiple tandem encodings and/or statistical multiplexing.<
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