Matches 101 - 126 out of 126 < 1 2 3
Match Document Document Title
4720862 Method and apparatus for speech signal detection and classification of the detected signal into a voiced sound, an unvoiced sound and silence  
A method and apparatus for speech signal detection and classification in which a partial auto-correlation and residual power analyzation circuit extracts a normalized first-order partial...
4672670 Apparatus and methods for coding, decoding, analyzing and synthesizing a signal  
In an ADPCM (Adaptive Differential PCM) system, in which the signal is commonly coded in C i , Q n , and σ parameters, a lower sampling rate which normally causes distortion is made possible by...
4631746 Compression and expansion of digitized voice signals  
Speech signal data compression is improved by a first compression using Time Domain Harmonic Scaling (TDHS), wherein two periods of voiced data are averaged together, followed by a second...
4618982 Digital speech processing system having reduced encoding bit requirements  
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,...
4486899 System for extraction of pole parameter values  
There is disclosed a system for the extraction of pole parameter values. The system comprises an autocorrelation value calculating circuit receiving an input voice signal through a time window, for...
4486900 Real time pitch detection by stream processing  
Continuous stream processing of an input signal to find the autocorrelation function and pitch period is simplied. The input speech signal is sampled at 8 khz, from which the autocorrelation...
4464784 Pitch changer with glitch minimizer  
A pitch changer with glitch minimizer is disclosed. The pitch changer changes the pitch of an input audio signal to a higher or lower level as desired. When performing such a pitch changing...
4401855 Apparatus for the linear predictive coding of human speech  
Improved apparatus for the linear predictive coding of human speech in which the speech is sampled through the use of analog filters and the linear predictive coding computations are performed with...
4401849 Speech detecting method  
Speech signal presence is decided if total signal power is above a first threshold, and if either low or high frequency components exceed thresholds as a large fraction of the total power. Total...
4390747 Speech analyzer  
A speech analyzer for extracting spectrum information and pitch information from natural speech wherein an accuracy of pitch extraction is enhanced by sampling pitch at a sampling frequency which...
4360708 Speech processor having speech analyzer and synthesizer  
Adaptive bit allocation optimizes the encoded transmission of speech signal parameters. Allocation is controlled by a voiced/unvoiced decision signal derived from occurrence rate distributions of...
4346262 Speech analysis system  
In a formant speech analysis synthesis system, formant extraction to control a recursive digital all-pole filter encounters the problem that pole-pairs are not orderly arranged and that real poles...
4340781 Speech analysing device  
Computation of the partial correlation coefficients (PARCOR K i ) of a signal, using less cascaded hardware, is implemented by first deriving a sequence of auto-correlation coefficients (v j )...
4301329 Speech analysis and synthesis apparatus  
In order to prevent errors and instability which may occur in a speech analysis and synthesis apparatus when the normalized predictive residual power falls to low levels, for example in...
4282405 Speech analyzer comprising circuits for calculating autocorrelation coefficients forwardly and backwardly  
A speech analyzer with improved pitch period extraction and improved accuracy of voiced/unvoiced decision comprises circuits for calculating autocorrelation coefficients forwardly and backwardly...
4270025 Sampled speech compression system  
A sampled speech compression and expansion system, for two-dimensional prssing of speech or other type of audio signal, comprises transmit/encode apparatus and receive/decode apparatus. The...
4219695 Noise estimation system for use in speech analysis  
Apparatus, and a related method, for use with a speech analysis system, which derives coefficient parameters by linear prediction and utilizes an intermediate correlation technique that produces a...
4216354 Process for compressing data relative to voice signals and device applying said process  
A voice signal is transmitted digitally at reduced bit rate by use of data compression. The original frequency components of a telephone band width of the voice signal sampled at 8 KHz and...
4184049 Transform speech signal coding with pitch controlled adaptive quantizing  
To improve the speech quality at lower bit rates within a digital communication system in which the coefficients of a frequency transform (e.g. discrete cosine transform) are adaptively encoded...
4161625 Method for determining the fundamental frequency of a voice signal  
A method of determining the fundamental frequency or pitch period of a voice signal from a difference signal, formed with the aid of predictors, between the original voice signal and the voice...
4081605 Speech signal fundamental period extractor  
A speech signal fundamental period extractor which receives a residual value signal from a speech analyzer, such as one using autocorrelators. The residual value signal is first passed through a...
3109070 Pitch synchronous autocorrelation vocoder  
3069507 Autocorrelation vocoder  
3037077 Speech-to-digital converter  
2911476 Reduction of redundancy and bandwidth  
2799734 Speech brighteners  
Matches 101 - 126 out of 126 < 1 2 3