A robust vocoder with pitch‐adaptive spectral envelope estimation and an integraled maximum‐likelihood pitch estimator
作者:
Douglas B. Paul,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1979)
卷期:
Volume 65,
issue S1
页码: 100-100
ISSN:0001-4966
年代: 1979
DOI:10.1121/1.2016895
出版商: Acoustical Society of America
数据来源: AIP
摘要:
This paper describes a low bit‐rate vocoder designed for improved speech reproduction quality and robustness. The vocoder includes a new algorithm, the Spectral Envelope Estimator, which forms the nucleus of the spectral analyzer. In addition to estimating the speech spectrum, the spectral analyzer also allows determination of a continuous estimate of the background noise spectrum which is used for noise suppression. A maximum‐likelihood pitch estimator, which shares the signal processing of the spectral envelope estimator, has been integrated into the vocoder to yield accurate pitch estimates of noisy speech. This system yields high‐quality speech reproduction at bit rates of 2.4 and 8.8 kbps. [Work sponsored by Defense Advanced Research Projects Agency.]
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