Journal ArticleDOI
On the use of pitch predictors with high temporal resolution
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TLDR
A first-order pitch predictor whose delay is specified as an integer number of samples plus a fraction of a sample at the current sampling frequency has a better performance than conventional multiple coefficient predictors and leads to more efficient coding of the predictor parameters.Abstract:
The use of pitch predictors in linear predictive coding systems is an efficient way to represent periodicity in the speech signal. Typically, the predictor is described by one parameter representing the delay in samples and 1 to 3 predictor coefficients can provide interpolation for periodicities that are not a multiple of the sampling interval and allow for a frequency-dependent gain. The authors describe a first-order pitch predictor whose delay is specified as an integer number of samples plus a fraction of a sample at the current sampling frequency. This realization has a better performance than conventional multiple coefficient predictors and leads to more efficient coding of the predictor parameters. >read more
Citations
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Journal ArticleDOI
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.
Book
Digital Speech: Coding for Low Bit Rate Communication Systems
A. Kindoz,Ahmet M. Kondoz +1 more
TL;DR: A detailed account of the most recently developed digital speech coders designed specifically for use in the evolving communications systems, including an in-depth examination of the important topic of code excited linear prediction (CELP).
PatentDOI
CS-ACELP speech compression system with adaptive pitch prediction filter gain based on a measure of periodicity
TL;DR: In this paper, a speech coding system employing an adaptive codebook model of periodicity is augmented with a pitch-predictive filter (PPF), which has a delay equal to the integer component of the pitch-period and a gain which is adaptive based on a measure of the periodicity of the speech signal.
Journal ArticleDOI
Design and description of CS-ACELP: a toll quality 8 kb/s speech coder
R. Salami,Claude Laflamme,J.-P. Adoul,A. Kataoka,S. Hayashi,Takehiro Moriya,C. Lamblin,D. Massaloux,S. Proust,P. Kroon,Y. Shoham +10 more
TL;DR: The coder structure is described in detail and the reasons behind certain design choices are discussed and a summary of the subjective test results based on a real-time implementation of this version are presented.
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.
References
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Proceedings ArticleDOI
Code-excited linear prediction(CELP): High-quality speech at very low bit rates
Manfred R. Schroeder,B. S. Atal +1 more
TL;DR: A code-excited linear predictive coder in which the optimum innovation sequence is selected from a code book of stored sequences to optimize a given fidelity criterion, indicating that a random code book has a slight speech quality advantage at low bit rates.
Journal ArticleDOI
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.
Journal ArticleDOI
Adaptive predictive coding of speech signals
Bishnu S. Atal,M. R. Schroeder +1 more
TL;DR: Preliminary studies suggest that the binary difference signal and the predictor parameters together can be transmitted at approximately 10 kilobits/second which is several times less than the bit rate required for log-PCM encoding with comparable speech quality.
Proceedings ArticleDOI
Pitch predictors with high temporal resolution
P. Kroon,Bishnu S. Atal +1 more
TL;DR: A first-order pitch predictor is described whose delay is specified as an integer number of samples plus a fraction of a sample at the current sampling rate, which has a better performance than conventional multiple coefficient predictors and leads to more efficient coding of the predictor parameters.
Journal ArticleDOI
Pitch prediction filters in speech coding
Ravi P. Ramachandran,Peter Kabal +1 more
TL;DR: It is found that the F-P cascade (formant filter before the pitch filter) outperforms the P-F cascade for the both transversal- and lattice-structured predictors.