PatentDOI
Digital speech processing system having reduced encoding bit requirements
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TLDR
In this paper, a digitized speech signal is divided into sections and each section is analyzed by the linear prediction method to determine the coefficients of a sound formation model, a sound volume parameter, information concerning voiced or unvoiced excitation and the period of the vocal band base frequency.Abstract:
A digitized speech signal is divided into sections and each section is analyzed by the linear prediction method to determine the coefficients of a sound formation model, a sound volume parameter, information concerning voiced or unvoiced excitation and the period of the vocal band base frequency. In order to improve the quality of speech without increasing the data rate, redundance reducing coding of the speech parameters is effected. The coding of the speech parameters is performed in blocks of two or three adjacent speech sections. The parameters of the first speech section are coded in a complete form, and those of the other speech sections in a differential form or in part not at all. The average number of bits required per speech section is reduced to compensate for the increased section rate, so that the overall data rate is not increased.read more
Citations
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PatentDOI
Speech synthesis method
TL;DR: In this article, a plurality of synthesis speech segments are generated by synthesizing training speech segments labeled with phonetic contexts and input speech segments while altering the pitch/duration of the input text segments in accordance with the pitch and duration of the training text segments.
Patent
Noisy speech autoregression parameter enhancement method and apparatus
Peter Händel,Patrik Sörqvist +1 more
TL;DR: In this paper, the background noise power spectral density (PSD) estimate was used to estimate the PSD of the speech parameters, and then the noisy speech PSD estimate was added to the speech parameter estimation.
PatentDOI
Digital transmission of acoustic signals over a noisy communication channel
John C. Hardwick,J.S. Lim +1 more
TL;DR: In this paper, the effect of uncorrectable bit errors is reduced by adaptively smoothing the spectral parameters in a speech decoder, depending upon the number of errors detected during the error control decoding of the received data.
PatentDOI
Telecommunications speech signal improvement by reduction of residual noise
TL;DR: In this article, a model-based iterative signal estimator is provided with a current estimate of the noise power spectral density, using signal frame samples determined by a voice activity detector to be noise-only frames.
PatentDOI
Spectral magnitude representation for multi-band excitation speech coders
TL;DR: A method for encoding a speech signal into digital bits including the steps of dividing thespeech signal into speech frames representing time intervals of the speech signal, determining voicing information for frequency bands of thespeech frames, and determining spectral magnitudes representative of the magnitudes of the spectrum at determined frequencies across the frequency bands.
References
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Journal ArticleDOI
The Residual-Excited Linear Prediction Vocoder with Transmission Rate Below 9.6 kbits/s
TL;DR: The concept of the RELP vocoder combines the advantages of linear predictive coding (LPC) and voice-excited vocoding and is robust in any operating environment.
Patent
Speech processor having speech analyzer and synthesizer
Tetsu Taguchi,Kazuo Ochiai +1 more
TL;DR: Adaptive bit allocation optimizes the encoded transmission of speech signal parameters as mentioned in this paper, which is controlled by a voiced/unvoiced decision signal derived from occurrence rate distributions of Partial Correlation Coefficient K1.
Journal ArticleDOI
Microprocessor realization of a linear predictive vocoder
TL;DR: The goal was a low-power, low-cost, compact special-purpose realization of a narrow-band speech terminal, and the resultant design is a general-purpose two-bus structure running at a 150 ns cycle time.
Patent
Control interface system for use with a memory device executing variable length instructions
TL;DR: In this article, a control interface system for use with a memory device executing variable length instructions and implementable utilizing integratable field effect semiconductor devices is described. But the implementation of such a system is not described.
Patent
Adaptive digital coder and decoder
TL;DR: In this paper, an adaptive coder and decoder for reducing the bit rate required to trans digitally encoded speech signals was proposed. But their scheme relies on the fact that the speech pattern of the average talker contains significant numbers of inter-syllable and interword pauses.