Proceedings ArticleDOI
Improved pitch prediction with fractional delays in CELP coding
Jorge S. Marques,Isabel Trancoso,José Tribolet,Luís B. Almeida +3 more
- pp 665-668
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TLDR
In this paper, a scheme for long-term prediction in CELP (code-excited linear predictive) coding using fractional delay prediction was discussed, which permits a more accurate representation of voiced speech and achieves an improvement of synthetic quality for female speakers.Abstract:
A scheme is discussed for long-term prediction in CELP (code-excited linear predictive) coding using fractional delay prediction. This technique permits a more accurate representation of voiced speech and achieves an improvement of synthetic quality for female speakers. The higher complexity of this type of predictor relative to the classical one is its major disadvantage. Suboptimal schemes in which the search for the functional pitch delay is restricted to a neighborhood of an integer pitch estimate can be envisaged to decrease the computational load. >read more
Citations
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Splitting the unit delay [FIR/all pass filters design]
TL;DR: This work presents a comprehensive review of FIR and allpass filter design techniques for bandlimited approximation of a fractional digital delay, focusing on simple and efficient methods that are well suited for fast coefficient update or continuous control of the delay value.
Journal ArticleDOI
Advances in speech and audio compression
TL;DR: Current activity in speech compression is dominated by research and development of a family of techniques commonly described as code-excited linear prediction (CELP) coding, which offer a quality versus bit rate tradeoff that significantly exceeds most prior compression techniques.
Journal ArticleDOI
Discretization-free design of variable fractional-delay FIR digital filters
TL;DR: In this article, a closed-form solution for obtaining the optimal coefficients of variable finite impulse-response (FIR) filters with continuously adjustable fractional-delay (FD) response is presented, which is formulated as a weighted-least-squares (WLS) approximation problem without discretizing (sampling) the frequency /spl omega/ and the variable FD p in the filter design process, and the objective error function of variable frequency response can be derived by numerical integration.
Journal ArticleDOI
SVD-based design and new structures for variable fractional-delay digital filters
Tian-Bo Deng,Y. Nakagawa +1 more
TL;DR: It is shown that the problem of designing one-dimensional (1-D) variable fractional-delay (VFD) digital filter can be elegantly reduced to the easier subproblems that involve one- dimensional constant filter (subfilter) designs and 1-D polynomial approximations.
Book
Voice and Audio Compression for Wireless Communications
TL;DR: This book discusses Speech Signals and Wavelets and Pitch Detection, Predictive Coding, and the Quadratic Spline Wavelets, and concludes with a comparison of Speech Transceivers and their applications.
References
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Predictive Coding of Speech at Low Bit Rates
TL;DR: A new class of speech coders are described which allow one to realize the precise optimum noise spectrum which is crucial to achieving very low bit rates, but also represent the important first step in bridging the gap between waveform coders and vocoders without suffering from their limitations.
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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.
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A class of analysis-by-synthesis predictive coders for high quality speech coding at rates between 4.8 and 16 kbit/s
P. Kroon,E.F. Deprettere +1 more
TL;DR: The general structure of this class of coders is reviewed, and the particulars of its members are discussed and the contributions of the various coder parameters to the performance of the coder are examined.
Proceedings Article
Pitch prediction with fractional delays in CELP coding.
TL;DR: A scheme is discussed for long-term prediction in CELP (code-excited linear predictive) coding using fractional delay prediction, which permits a more accurate representation of voiced speech and achieves an improvement of synthetic quality for female speakers.
Proceedings ArticleDOI
A study on the realtionships between stochastic and harmonic coding
TL;DR: The advantages and disadvantages of both harmonic and stochastic coding for processing voiced and unvoiced speech segments are discussed, and the potential benefits of combining the two methods in coding applications are examined.