Proceedings ArticleDOI
Techniques for improving the robustness of an adaptive predictive coder in the presence of channel errors
Elliot Singer
- Vol. 5, pp 530-534
TLDR
The introduction of smoothing strategies to the basic APC vocoder added 900-1100 bps to the bit rate and resulted in significantly improved robustness in channel errors.Abstract:
A study was performed to evaluate various techniques for improving the robustness of an Adaptive Predictive Coder operating in the presence of channel errors. The communications environment consisted of a packetized, symbol oriented system in which channel errors were manifested as both 5-bit symbol errors in the received bit stream and the occasional loss of an entire packet of data. To reduce the effects of symbol errors forward error correction was applied to a selected subset of the transmitted parameter bits. At the receiver, smoothing strategies were employed to replace those parameters in which errors could be detected but not corrected and to cope with situations in which entire packets were lost. The introduction of these techniques to the basic APC vocoder added 900-1100 bps to the bit rate and resulted in significantly improved robustness in channel errors.read more
Citations
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Journal ArticleDOI
Comparison of Adaptive Linear Prediction Algorithms in ADPCM
TL;DR: A comparison of adaptive differential pulse code modulation (ADPCM) speech compression systems is made using different recursive adaptive linear prediction algorithms, suggesting that the predictor having the simplest implementation is the best.
Patent
Error correction in packet-based communication networks using validation sets
TL;DR: In this paper, a validation set process compares corrupted data against values in a set of known valid values and selects one of the known valid value to replace the corrupted data, if not, values are changed to make them consistent.
Patent
Speech-adaptive predictive coding system
TL;DR: In this article, a speech-adaptive predictive coding system, an encoding apparatus, a decoding apparatus and an error correcting method for such system was described, which is capable of reproducing speech-signals with high quality.
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