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Richard Harry Ketchum
Researcher at Bell Labs
Publications - 5
Citations - 247
Richard Harry Ketchum is an academic researcher from Bell Labs. The author has contributed to research in topics: Codebook & Linear prediction. The author has an hindex of 3, co-authored 5 publications receiving 247 citations. Previous affiliations of Richard Harry Ketchum include AT&T Corporation.
Papers
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Proceedings ArticleDOI
Improved speech quality and efficient vector quantization in SELP
TL;DR: In this paper, a stochastically excited linear prediction (SELP) algorithm consisting of a two-stage vector quantization using an adaptive codebook and a deterministic stochastic codebook is described.
Journal ArticleDOI
An efficient stochastically excited linear predictive algorithm for high quality low bit rate transmission of speech
TL;DR: Improvements to the SELP algorithm are described which result in better speech quality and higher computational efficiency, and a new recursive algorithm which performs a very fast search through the adaptive codebook.
PatentDOI
Code excited linear predictive vocoder using virtual searching
TL;DR: In this article, a stochastically excited linear predictive (SELP) encoder is used in series with the adaptive CELP encoder to search its own overlapping codebook in a recursive manner to determine a candidate vector that provides the best match.