PatentDOI
An adaptive pitch pulse enhancer and method for use in a codebook excited linear prediction (CELP) search loop
TLDR
An adaptive pitch pulse enhancer and method, adaptive to a voicing measure of input speech, for modifying the adaptive codebook of a CELP search loop to enhance the pitch pulse structure was proposed in this paper.Abstract:
An adaptive pitch pulse enhancer and method, adaptive to a voicing measure of input speech, for modifying the adaptive codebook of a CELP search loop to enhance the pitch pulse structure of the adaptive codebook. The adaptive pitch pulse enhancer determines a voicing measure of an input signal, the voicing measure being voiced when the input signal includes voiced speech and the voicing measure being unvoiced when the input signal does not include voiced speech, modifies a total excitation vector produced by the CELP search loop in accordance with the voicing measure of the input signal, and updates the adaptive codebook of the CELP search loop by storing the modified total excitation vector in the adaptive codebook.read more
Citations
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Completed fixed codebook for speech encoder
TL;DR: In this article, a multi-rate speech codec supports a number of encoding bit rate modes by adaptively selecting encoding bits rate modes to match communication channel restrictions, and a variety of techniques are applied, many of which involve the classification of the input signal.
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TL;DR: In this paper, a correlation degree comparison unit (304) calculates correlation in a first channel (correlation degree between the past signal and the current signal in the first channel) from the first-channel audio signal, and a second-channel signal generation unit (311) compares the correlation in the two channels and selects the channel having the greater correlation.
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Speech coding including soft adaptability feature
Erik Ekudden,Roar Hagen +1 more
TL;DR: Adaptive speech coding includes receiving an original speech signal, performing a current decoding operation (200) on the coded information, and adapting the current decoding operations in response to the information used in the previous decoding operation as mentioned in this paper.
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Subframe-based correlation
TL;DR: In this article, a subframe-based correlation method for pitch and voicing is provided by finding the pitch track through a speech frame that minimizes pitch prediction residual energy over the frame.
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Codebook structure and search for speech coding
TL;DR: In this paper, a speech compression system with a fixed codebook structure and a new search routine is proposed for speech coding, which is capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech.
References
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PatentDOI
Method and apparatus for low-delay celp speech coding and decoding
TL;DR: In this paper, a low-bitrate (typically 8 kbit/s or less), low-delay digital coder and decoder based on Code Excited Linear Prediction for speech and similar signals features backward adaptive adjustment for codebook gain and short-term synthesis filter parameters and forward adaptive adjustment of long-term (pitch) synthesis filter parameter.
PatentDOI
Method of use of voice message coder/decoder
TL;DR: A code excited linear predictive coder and decoder well suited to speech recording, transmission and reproduction, especially in voice messaging systems, provides backward adaptive gain control of stored codevectors to be applied to a synthesis filter prior to being compared with sequences of input speech signals.
PatentDOI
Hybrid switched multi-pulse/stochastic speech coding technique
TL;DR: In this paper, an unvoiced speech performance was improved in low-rate multi-pulse coders by employing a simple architecture with an output quality comparable to code excited linear predictive (CELP) coding.
Proceedings ArticleDOI
Pitch sharpening for perceptually improved CELP, and the sparse-delta codebook for reduced computation
TL;DR: The authors introduce two techniques for improving low-bit-rate CELP (code excited linear prediction) speech coders by introducing sparse-delta stochastic codebook and pitch sharpening algorithms.
PatentDOI
Linear predictive codeword excited speech synthesizer
TL;DR: In this paper, a linear predictive codeword excited speech synthesizer performs a voiced/unvoiced decision to determine the type of excitation to be supplied to a synthesis filter.