Publications – Details
A Probabilistic Framework for Optimum Speech Extrapolation in Digital Mobile Radio
- Author:
- Christian G. Gerlach
- Book Title:
- Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
- Volume:
- II
- Venue:
- Minneapolis, Minnesota, USA
- Date:
- Apr. 1993
- Pages:
- 419–422
- Language:
- English
Abstract
In digital mobile radio systems the speech quality can be degraded severely if the channel decoder produces residual bit errors, e.g., due to heavy burst errors on the channel. A novel combined speech extrapolation and error detection algorithm is presented which can improve the speech significantly in the case of residual bit errors. This algorithm, which is part of the speech decoding process, uses a posteriori probabilities of speech parameters. With the extracted a posteriori probability, optimum estimators adapted to human perception can be applied and soft decision information can be exploited fully. In terms of perceptual performance, the MS (mean-square) estimator is superior to the MAP (maximum a posteriori) estimator. The method was tested under realistic conditions using an 8-kbit/s CELP (code excited linear prediction) codec. A significant improvement of subjective speech quality can be achieved
Download of Publication
Copyright Notice
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
The following notice applies to all IEEE publications:
© IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.