Patent
Data processing apparatus
TLDR
In this article, a data processing apparatus capable of obtaining high-quality sound data was proposed for mobile phones for transmitting and receiving speech data, which can be used to transmit and receive speech data.Abstract:
The present invention relates to a data processing apparatus capable of obtaining high-quality sound data. A tap generation section 121 generates a prediction tap used for a process in a prediction section 125 by extracting decoded speech data in a predetermined positional relationship with subject data of interest within the decoded speech data such that coded data is decoded by a CELP method and by extracting an I code located in a subframe according to a position of the subject data in the subject subframe. Similarly to the tap generation section 122, a tap generation section 122 generates a class tap used for a process in a classification section 123. The classification section 123 performs classification on the basis of the class tap, and a coefficient memory 124 outputs a tap coefficient corresponding to the classification result. The prediction section 125 performs a linear prediction computation by using the prediction tap and the tap coefficient and outputs high-quality decoded speech data. The present invention can be applied to mobile phones for transmitting and receiving speech.read more
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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.
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.
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.
Patent
Method and system for sub-band hybrid coding
TL;DR: In this paper, a pitch and voice dependent spectral estimation algorithm (voicing algorithm) is proposed for processing audio and speech signals using a pitch-and voice-dependent spectral estimation (VoE) model.
PatentDOI
Digital speech coder having improved sub-sample resolution long-term predictor
Ira A. Gerson,Mark A. Jasiuk +1 more
TL;DR: In this paper, a digital speech coder includes a longterm filter (124) having an improved sub-sample resolution long-term predictor (FIG. 5 ) which allows for subsample resolution for the lag parameter L. The output vector b(n) is fed back to a delayed vector generator block (530) of the longterm predictor.