Patent
Method and system for CELP speech coding and codebook for use therewith
Yuhung Kao,John S. Baras +1 more
TLDR
In this paper, a CELP speech processor utilizes an organized, non-overlapping, algebraic codebook containing a predetermined number of vectors, uniformly distributed over a multi-dimensional sphere to generate a remaining speech residual.Abstract:
Apparatus and method for encoding speech using a codebook excited linear predictive (CELP) speech processor and an algebraic codebook for use therewith The CELP speech processor receives a digital speech input representative of human speech and performs linear predictive code analysis and perceptual weighting filtering to produce a short term speech information and a long term speech information The CELP speech processor utilizes an organized, non-overlapping, algebraic codebook containing a predetermined number of vectors, uniformly distributed over a multi-dimensional sphere to generate a remaining speech residual The short term speech information, long term speech information and remaining speech residual are combinable to form a quality reproduction of the digital speech inputread more
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References
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Patent
Vector excitation speech or audio coder for transmission or storage
Grant Davidson,Allen Gersho +1 more
TL;DR: In this paper, a vector excitation coder efficiently com-presses vectors by using an optimum codebook designed off-line, using an initial arbitrary codebook and a set of speech training vectors exploiting codevector sparsity.
PatentDOI
Method for coding speech at low bit rates
TL;DR: A method for coding speech at low bit rates is disclosed, which requires substantially less computational resources than the well known stochastic coding method.
Patent
Fast search method for vector quantizer communication and pattern recognition systems
TL;DR: In this paper, a vector encoding quantization technique based on a geometrically-oriented search procedure is proposed for signal and data compression, which optimizes the system performance with substantially reduced computational complexity.
PatentDOI
Method of and apparatus for generating auxiliary information for expediting sparse codebook search
TL;DR: In this article, a method of searching the distance between a target vector and a stored codebook vector is enhanced by use of a distortion metric derived from energy terms and correlation terms of the codebook entries.
PatentDOI
Efficient codebook search for CELP vocoders
William C. Yip,David L. Barron +1 more
TL;DR: A new way of determining correlation coefficients for stochastic codebook vectors for CELP coding of speech takes advantage of the sparsely populated nature of stochastics codebook vector signals.