Enhancement of ADPCM speech coding with backward-adaptive algorithms for postfiltering and noise feedback
- 1 January 1988
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal on Selected Areas in Communications
- Vol. 6 (2), 364-382
- https://doi.org/10.1109/49.613
Abstract
It is shown that postfiltering circuits based on higher order LPC (linear predictive coding) models can provide very low distortion in terms of special tilt. Thus, they can provide better speech enhancement than circuits based on the backward-adaptive pole-zero predictor in ADPCM (adaptive digital pulse code modulation). Quantitative criteria for designing postfiltering circuits based on higher-order LPC models are discussed. These postfilters are particularly attractive for systems where high-order LPC analysis is an integral part of the coding algorithm. In a subjective test that used a computer-simulated version of these circuits, enhanced ADPCM obtained a mean opinion score of 3.6 at 16 kb/sKeywords
This publication has 13 references indexed in Scilit:
- A 32 kb/s toll quality ADPCM codec using a single chip signal processorPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- A 16 kbps ADPCM with multi-quantizer (ADPCM-MQ) codec and its implementation by digital signal processorPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Adaptive postfiltering of 16 kb/s-ADPCM speechPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- A family of ADPCM coders implemented on real-time hardwarePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Enhancement of ADPCM speech coding with backward-adaptive algorithms for postfiltering and noise feedbackIEEE Journal on Selected Areas in Communications, 1988
- Backward adaptive prediction as spectral analysis within a closed loopIEEE Transactions on Acoustics, Speech, and Signal Processing, 1985
- Predictive Coding of Speech at Low Bit RatesIEEE Transactions on Communications, 1982
- Improving the Quality of a Noisy Speech SignalBell System Technical Journal, 1981
- Adaptive Post-Filtering of ADPCM SpeechBell System Technical Journal, 1981
- Distance measures for speech processingIEEE Transactions on Acoustics, Speech, and Signal Processing, 1976