Publications – Details
TURBO Error Concealment of Mutually Independent Source Codec Parameters
- Authors:
- Marc Adrat and Peter Vary
- Book Title:
- Proceedings of International ITG Conference on Source and Channel Coding (SCC)
- Venue:
- Erlangen, Germany
- Date:
- Jan. 2004
- Pages:
- 287–294
- Language:
- English
Abstract
Modern error concealment techniques like softbit source decoding
(SBSD) by parameter estimation utilize natural residual source redundancy of codec parameters as a priori knowledge. But, the capabilities of conventional SBSD remain limited if applied to sets of mutually independent source codec parameters. This contribution deals with an advancement of conventional SBSD. At the transmitter, a smearing filter with a code rate near r=1 is proposed introducing artificial channel coding redundancy on bit-level to the mutually independent codec parameters. At the receiver, a TURBO-like evaluation of this artificial channel coding redundancy and of the natural residual source redundancy according to the iterative source-channel decoding (ISCD) algorithm permits step-wise quality improvements by several iterations. In this paper, we extensively discuss the key innovations of this TURBO error concealment technique over formerly known ISCD schemes. In addition, the convergence is analyzed using EXIT-charts. Finally, the remarkable performance gains over conventional SBSD are demonstrated by simulation.
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