Matches 301 - 350 out of 467 < 1 2 3 4 5 6 7 8 9 10 >
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5781696 Speed-variable audio play-back apparatus  
A speed-variable audio play-back apparatus which includes a pitch detecting circuit for separating speech source components and audio characteristics from an input audio signal, a pitch modulating...
5774862 Computer communication system  
Musical intervals are used as codes to communicate preselected commands or inputs to a computer. The system can use human voice sounding notes (DO-RE, etc.) successively to establish the interval...
5774838 Speech coding system utilizing vector quantization capable of minimizing quality degradation caused by transmission code error  
In a vector quantization apparatus for expressing a target vector by using a code vector designated by an index, an error evaluating section performs error evaluation for a code vector without...
5774836 System and method for performing pitch estimation and error checking on low estimated pitch values in a correlation based pitch estimator  
An improved vocoder system and method for estimating pitch in a speech waveform which more accurately disregards false pitch estimates resulting from secondary excitations. The vocoder system first...
5751899 Method and apparatus of analysis of signals from non-stationary processes possessing temporal structure such as music, speech, and other event sequences  
A method and apparatus for the analysis of a non-stationary signal to determine the presence of pseudo-periodic components in the signal. The present invention possesses a memory for recent events,...
5751900 Speech pitch lag coding apparatus and method  
A pitch lag is extracted for each of a predetermined number of sub-frames. A predicted pitch lag for a pertinent sub-frame in the predetermined number of sub-frames is calculated on the basis of at...
5745871 Pitch period estimation for use with audio coders  
A highly efficient, low delay pitch parameter derivation and quantization permits overall delay which is a fraction of prior coding delays for equivalent speech quality at low bitrates. In...
5745650 Speech synthesis apparatus and method for synthesizing speech from a character series comprising a text and pitch information  
A speech synthesis method and apparatus for synthesizing speech from a character series comprising a text and pitch information. The apparatus includes a parameter generator for generating power...
5727125 Method and apparatus for synthesis of speech excitation waveforms  
A speech vocoder device and corresponding method synthesizes speech excitation waveforms. The method entails reconstructing (216) an excitation target from decoded speech data, creating (220)...
5717818 Audio signal storing apparatus having a function for converting speech speed  
The speed of an input speech is changed without any change of the pitch of the input speech. Raw data of a speech are stored so that the speed of the speech can be modulated continuously on the...
5704002 Process and device for minimizing an error in a speech signal using a residue signal and a synthesized excitation signal  
The present invention relates to a device and process for the digital coding and decoding of speech comprising a short term prediction, a long term prediction and a residual wave coding technique...
5704009 Method and apparatus for transmitting a voice sample to a voice activated data processing system  
An apparatus and method transmit analyzed voice samples from a wireless transmitting device worn by a user to a remote voice activated data processing system having a speech recognition system...
5704000 Robust pitch estimation method and device for telephone speech  
A pitch estimating method includes the steps of (1) determining a set of pitch candidates to estimate a pitch of a digitized speech signal at each of a plurality of time instants, wherein series of...
5701391 Method and system for compressing a speech signal using envelope modulation  
A speech signal is sampled to form a sequence of speech data and segmented into segments. The envelope of each segment is detected to form an envelope segment. Each datum of the segment is divided...
5699477 Mixed excitation linear prediction with fractional pitch  
An analyzer and synthesizer (500) for human speech using LPC filtering (530) of an excitation of mixed (508-518-520) voiced pulse train (502) and unvoiced noise (512) with fractional sampling...
5696873 Vocoder system and method for performing pitch estimation using an adaptive correlation sample window  
An improved vocoder system and method for estimating pitch in a speed waveform. The method comprises an improved correlation method for estimating the pitch parameter which more accurately...
5694520 Method and device for speech recognition  
A method and device for recognizing dialectal variations in a language. From an incoming speech is on one hand a speech recognition procedure being performed, and on the other hand the fundamental...
5671330 Speech synthesis using glottal closure instants determined from adaptively-thresholded wavelet transforms  
A speech synthesis system making use of a pitch-synchronous waveform overlap method to realize stable speech synthesis processing in which pitch shaking is negligible. The present invention is...
5666350 Apparatus and method for coding excitation parameters in a very low bit rate voice messaging system  
An apparatus codes excitation parameters for very low bit rate voice messaging using a method that processes a voice message to generating speech parameters. The speech parameters are separated...
5666464 Speech pitch coding system  
A plurality of pitch period transition paths are extracted by a pitch tracking over a frame, and a path of a minimum average prediction gain over the frame is selected from the extracted paths. A...
5664051 Method and apparatus for phase synthesis for speech processing  
A speech decoder apparatus for synthesizing a speech signal from a digitized speech bit stream of the type produced by processing speech with a speech encoder. The apparatus includes an analyzer...
5657418 Provision of speech coder gain information using multiple coding modes  
In a speech coder (100), excitation source gain information (802) is transmitted along with a coding mode indicator. The coding mode indicator indicates how the gain information is to be...
5651091 Method and apparatus for low-delay CELP speech coding and decoding  
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...
5651092 Method and apparatus for speech encoding, speech decoding, and speech post processing  
A speech analysis unit and a window locating unit are implemented in a speech encoding apparatus. The speech encoding apparatus encodes input speech per analysis frame defined having a fixed length...
5644678 Method of estimating voice pitch by rotating two dimensional time-energy region on speech acoustic signal plot  
A method of estimating the pitch of a speech acoustic signal in a time interval in which said signal is a voiced one, wherein the pitch corresponds to the distance between the contact points of a...
5644677 Signal processing system for performing real-time pitch shifting and method therefor  
A signal processing system (50) performs real-time pitch shifting for applications such as karaoke, tapeless answering machines, and the like while minimizing distortion. A digital input signal is...
5630012 Speech efficient coding method  
There is provided a speech efficient coding method applicable to, e.g., analysis by a synthesis system such as an MBE vocoder, and comprising the steps of (a) dividing an input speech signal into...
5630015 Speech signal processing apparatus for detecting a speech signal from a noisy speech signal  
A band division process including a Fourier transformation is performed for an inputted speech signal, thereby outputting spectrum signals of plural channels. A cepstrum analysis process is...
5623575 Excitation synchronous time encoding vocoder and method  
A method for excitation synchronous time encoding of speech signals. The method includes steps of providing an input speech signal, processing the input speech signal to characterize qualities...
5619566 Voice activity detector for an echo suppressor and an echo suppressor  
A voice activity detector is described suitable for use in an echo suppressor. It comprises a whitening filter (19) for levelling the spectrum of the audio signal on the transmit path to provide a...
5619004 Method and device for determining the primary pitch of a music signal  
A method and device for very quickly and accurately determining the fundamental frequency of an input analog electrical signal. The method first uses sparse range autocorrelation to determine the...
5615302 Filter bank determination of discrete tone frequencies  
Specifically shaped filter responses enable power or amplitude measurements at the filter outputs to be simply transformed into accurate measurements of some desired function of the frequency (such...
5602960 Continuous mandarin chinese speech recognition system having an integrated tone classifier  
A speech recognition system for continuous Mandarin Chinese speech comprises a microphone, an A/D converter, a syllable recognition system, an integrated tone classifier, and a confidence score...
5577159 Time-frequency interpolation with application to low rate speech coding  
A new method for high quality speech coding, Timing-Frequency Interpolation (TFI) which offers advantages over conventional CELP (code-excited linear predictive) algorithms for low rate coding. The...
5548680 Method and device for speech signal pitch period estimation and classification in digital speech coders  
A method and a device for speech signal digital coding are provided where at each frame there is carried out a long-term analysis for estimating pitch period d and a long- term prediction...
5528723 Digital speech coder and method utilizing harmonic noise weighting  
A digital speech coder utilizes harmonic noise weighting to overcome some limitations of low-rate CELP-type speech coders in reproducing voiced speech. In addition to a short term correction...
5522010 Pitch control apparatus for setting coefficients for cross-fading operation in accordance with intervals between write address and a number of read addresses in a sampling cycle  
A pitch control apparatus which suppresses the occurrence of a tremolo tone which the interval control is performed. Input audio signal data is written at a memory position at a designated writing...
5519779 Method and apparatus for inserting signaling in a communication system  
Signaling is inserted (102) into a communication channel of a communication system by inserting the signaling into the communication channel if the communication channel has sufficient available...
5495555 High quality low bit rate celp-based speech codec  
Code excited linear prediction (CELP) is performed using two voiced and unvoiced sets of windows, each set is used both for linear prediction and pitch determination. The accompanying degradation...
5483617 Elimination of feature distortions caused by analysis of waveforms  
A waveform to be analysed is spectrally resolved into a plurality of frequency channel outputs (1). Amplitudes of the channel outputs are then compared with threshold values (4), with the threshold...
5437050 Method and apparatus for recognizing broadcast information using multi-frequency magnitude detection  
A method and apparatus for recognizing broadcast information, the method including the steps of receiving a set of broadcast information; converting the set of broadcast information into a...
5428708 Musical entertainment system  
A karaoke type system allows a participant to sing on key with a prerecorded song. A microphone produces an input signal that corresponds to a singer's voice, and a pitch corrector samples the...
5381512 Method and apparatus for speech feature recognition based on models of auditory signal processing  
A stimulus waveform is processed using a model of the human auditory system to provide a plurality of output waveforms. Each output waveform corresponds to excitation at different locations along...
5369725 Pitch control system  
A system for controlling the pitch between an original sound and a reproduced sound system in which generation of tremolo sound is suppressed and a clock is used commonly for write timing and read...
5353372 Accurate pitch measurement and tracking system and method  
A quasi-periodic signal is sampled at a specified rate, and then a predicted value of the signal is computed from a set of 2M+1 time lagged signal samples. The time lagged samples are centered in...
5347611 Apparatus and method for transparent tone passing over narrowband digital channels  
A method of passing tones transparently over narrowband channels without having to detect the tones at the transmit side is described. This method requires neither separate handling of tones for...
5325461 Speech signal coding and decoding system transmitting allowance range information  
A speech signal coding apparatus inputs a pitch period generated by coding a speech signal, and outputs information on a range for said pitch period, together with the pitch period. A speech signal...
5321636 Method and arrangement for determining signal pitch  
A method and an arrangement are described by means of which a pitch in a signal (s(t)) can be determined. In fact the probability density function (pdf) of the pitch is determined as a function of...
5313553 Method to evaluate the pitch and voicing of the speech signal in vocoders with very slow bit rates  
The disclosed method consists of: the cutting up, after sampling, of the speech signal into frames of a determined duration; the carrying out a first self-adaptive filtering of the sampled signal...
5267317 Method and apparatus for smoothing pitch-cycle waveforms  
A method and apparatus for processing a reconstructed speech signal from an analysis-by-synthesis decoder are provided to improve the quality of reconstructed speech. By operation of the invention,...
Matches 301 - 350 out of 467 < 1 2 3 4 5 6 7 8 9 10 >