The application of subband coding to improve quality and robustness of the sinusoidal transform coder
- 1 January 1993
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2, 439-442 vol.2
- https://doi.org/10.1109/icassp.1993.319334
Abstract
In an attempt to improve the performance of the sinusoidal transform coder (STC) in the presence of channel errors, a structure evolved that was similar to a subband coder. Using some new ideas for subband coding, such as vector quantization of the subband energies and adaptive bit allocation based on the decoded energies, a new quantization algorithm for STC evolved that was not only more robust in channel errors, but led to improved quality, particularly at the 2400 bit/s data rate. It may be possible further to improve the speech quality at this rate by using vector quantization to code the shape of the subband channel gains.Keywords
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