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A sub-band coder designed for combined source and channel coding [speech coding]

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4 Author(s)
Cox, R. ; AT&T Bel Lab., Murray Hill, NJ, USA ; Hagenauer, J. ; Seshadri, N. ; Sundberg, C.-E.

The coder is a dynamic bit allocation sub-band coder of the type first proposed by Ramstad (1982). It is structured in such a way that the relative importance of all bits is established as a byproduct of the dynamic bit allocation. It is shown that there is a difference in error sensitivity of four orders of magnitude between the most and the least important bits of the bit stream on average. A very flexible unequal error protection scheme is used to match the error sensitivity of the sub-band coder bit stream. This is accomplished using the concept of rate compatible punctured convolutional coding. The resulting coder gives robust performance over a simulated noisy channel. Its nominal bit rate is 16 kb/s, with 12 kb/s assigned for speech coding and 4 kb/s assigned for error correction. The entire encoder and decoder have been implemented on a single AT&T DSP-32 digital signal processor

Published in:

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Date of Conference:

11-14 Apr 1988