Statistical Block Protection Coding for DPCM-AQF Speech
- 1 November 1980
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Communications
- Vol. 28 (11) , 1899-1907
- https://doi.org/10.1109/tcom.1980.1094617
Abstract
The statistical block protection coding scheme [2] for protecting DPCM encoded speech signals through noisy channels has been extended to accommodate DPCM-AQF encoded speech, where AQF stands for adaptive quantization with forward (explicit) transmission of step size. Signal-to-noise ratio (SNR) gains, typically 12 dB, have been achieved over a dynamic range > 20 dB for a bit error rate (BER) of 1.4 percent and the SNR improvement is found to increase with BER. Perceptual improvements in decoded speech have a good correspondence with the gains in SNR. The penalty for this substantial enhancement in the performance of the DPCM-AQF system is an increase in transmission bit rate of 3.5 percent and encoding delay of 64 ms.Keywords
This publication has 3 references indexed in Scilit:
- Statistical Block Protection Coding for DPCM-AQF SpeechIEEE Transactions on Communications, 1980
- DPCM with Forced Updating and Partial Correction of Transmission ErrorsBell System Technical Journal, 1979
- Step-Size Transmitting Differential Coders for Mobile TelephonyBell System Technical Journal, 1975