Matches 151 - 200 out of 466 < 1 2 3 4 5 6 7 8 9 10 >
Match Document Document Title
6687666 Voice encoding device, voice decoding device, recording medium for recording program for realizing voice encoding/decoding and mobile communication device  
A CELP type voice encoding device and a CELP type encoding device. Both the CELP type encoding device and the CELP type encoding device have a noise code book that can be searched in two modes in...
6687664 Audio-visual scrubbing system  
A method and apparatus for an audio scrubbing system for synchronizing audio to an asynchronous clock while preserving pitch utilizes a phase-vocoder to implement time-scaling without pitch-shifting.
6687665 Device for normalizing voice pitch for voice recognition  
In a voice pitch normalization device equipped in a voice recognition device VRAp for recognizing an incoming command voice Sva uttered by any speaker, and used to normalize the incoming command...
6678650 Apparatus and method for converting reproducing speed  
An apparatus and method for converting the speed of reproducing an input acoustic signal. The apparatus and method can efficiently delay the output signal without using an output-data storage...
6678649 Method and apparatus for subsampling phase spectrum information  
Method and apparatus for subsampling phase spectrum information by analyzing and reconstructing a prototype of a frame. The prototype is analyzed by correlating phase parameters generated from the...
6675141 Apparatus for converting reproducing speed and method of converting reproducing speed  
A method and apparatus for converting the reproducing speed of an acoustic signal where, of the acoustic signals held in a data recording section 1 , the input acoustic signal s 1 (sampled for...
6665637 Error concealment in relation to decoding of encoded acoustic signals  
The present invention relates to the concealment of errors in decoded acoustic signals caused by encoded data representing the acoustic signals being partially lost or damaged during transmission...
6658197 Audio signal reproduction apparatus and method  
The audio signal reproduction apparatus and method according to the present invention reproduces a digital audio signal recorded on a recording medium by a predetermined number of samples, at a...
6640209 Closed-loop multimode mixed-domain linear prediction (MDLP) speech coder  
A closed-loop, multimode, mixed-domain linear prediction (MDLP) speech coder includes a high-rate, time-domain coding mode, a low-rate, frequency-domain coding mode, and a closed-loop...
6633839 Method and apparatus for speech reconstruction in a distributed speech recognition system  
In a distributed speech recognition system comprising a first communication device which receives a speech input ( 34 ), encodes data representative of the speech input, and transmits the encoded...
6633841 Voice activity detection speech coding to accommodate music signals  
An extended signal coding system that accommodates substantially music-like signals within a signal while maintaining a high perceptual quality in a reproduced signal during discontinued...
6629067 Range control system  
A range control system includes an input section for inputting a singing voice, a fundamental frequency extracting section for extracting a fundamental frequency of the inputted voice, and a pitch...
6594626 Voice encoding and voice decoding using an adaptive codebook and an algebraic codebook  
Disclosed is a voice encoding method having a synthesis filter implemented using linear prediction coefficients obtained by dividing an input signal into frames each of a fixed length, and...
6587816 Fast frequency-domain pitch estimation  
A method for estimating a pitch frequency of an audio signal includes computing a first transform of the signal to a frequency domain over a first time interval, and computing a second transform of...
6584437 Method and apparatus for coding successive pitch periods in speech signal  
A method and apparatus for coding successive pitch periods of a speech signal. Based on a priori knowledge of statistical properties of successive speech periods, a shaped lattice structure is...
6584438 Frame erasure compensation method in a variable rate speech coder  
A frame erasure compensation method in a variable-rate speech coder includes quantizing, with a first encoder, a pitch lag value for a current frame and a first delta pitch lag value equal to the...
6581031 Speech encoding method and speech encoding system  
In this speech encoding system, the limiter circuit is input with the delay of adaptive codebook obtained for the previous subframe, and the pitch cycle search range is limited so that the delay of...
6577998 Systems and methods for communicating through computer animated images  
The current method and system generates an animation sequence for a live character during communication. In response to a performer's voice and other inputs, the animation sequence of the character...
6577995 Apparatus for quantizing phase of speech signal using perceptual weighting function and method therefor  
An apparatus for quantizing the phase of a speech signal using a perceptual weighting function and a method therefor are provided. The apparatus for quantizing the phase of a speech signal using a...
6564182 Look-ahead pitch determination  
An encoding system is presented for coding and processing an input signal on a frame-by-frame basis. The encoding system processes each frame in two subframes of a first half and a second half. In...
6553342 Tone based speech recognition  
A method and apparatus for speech recognition involves classifying ( 38 ) a digitized speech segment according to whether the speech segment comprises voiced or unvoiced speech and utilizing that...
6549884 Phase-vocoder pitch-shifting  
A system for pitch-shifting an audio signal wherein resampling is done in the frequency domain. The system includes a method for pitch-shifting a signal by converting the signal to a frequency...
6542857 System and method for characterizing synthesizing and/or canceling out acoustic signals from inanimate sound sources  
A system and method for characterizing, synthesizing, and/or canceling out acoustic signals from inanimate sound sources is disclosed. Propagating wave electromagnetic sensors monitor excitation...
6535843 Automatic detection of non-stationarity in speech signals  
When necessary to time scale a speech signal, it is advantageous to do it under influence of a signal that measures the small-window non-stationarity of the speech signal. Three measures of...
6526376 Split band linear prediction vocoder with pitch extraction  
A speech coder includes an encoder using an analysis and synthesis approach. The encoder uses a pitch determination algorithm requiring analysis in both the frequency domain and the time domain, a...
6523002 Speech coding having continuous long term preprocessing without any delay  
A zero delay continuous long term (LT) pre-processing method operable in a speech codec that introduces no delay. The present invention provides an elegant solution to perform long term (LT)...
6519558 Audio signal pitch adjustment apparatus and method  
A signal processing method and apparatus is disclosed, which is capable of reproducing a coded audio signal by decoding it while shifting its pitch, and reproducing, from an original sound, a sound...
6512965 Robot and control method for entertainment  
With a robot and a control method for it, information is read in from the outside, based on which a particular object is detected, and it is judged upon detecting the object whether or not the...
6510407 Method and apparatus for variable rate coding of speech  
A speech encoding method using analysis-by-synthesis includes sampling an input speech and dividing the resulting speech samples into frames and subframes. The frames are analyzed to determine...
6510410 Method and apparatus for recognizing tone languages using pitch information  
A method and an apparatus for automatic recognition of tone languages, employing the steps of converting the words of speech into an electrical signal, generating spectral features from the...
6505154 Method and device for comparing acoustic input signals fed into an input device with acoustic reference signals stored in a memory  
The invention relates to a method and a device for comparing acoustic input signals fed into an input device ( 1 ) with acoustic reference signals stored in a memory ( 3 ). The first step in this...
6480821 Methods and apparatus for reducing noise associated with an electrical speech signal  
A system for enhancing the signal-to-noise ratio of a speech signal is avoided. A plurality of local energy maximums associated with a speech signal are determined. Presumably, each of these local...
6470309 Subframe-based correlation  
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. The method...
6470310 Method and system for speech encoding involving analyzing search range for current period according to length of preceding pitch period  
Processing for producing encoded output representing information about a pitch period of an input speech signal is performed. The pitch period of a previously entered speech signal is stored in a...
6466903 Simple and fast way for generating a harmonic signal  
A fast and accurate method for generating a sampled version of the signal h  ( t ) = ∑ k = 1 K  A k  cos  ( k   ω o  t + ϕ k ) , is achieved by retrieving from memory...
6463414 Conference bridge processing of speech in a packet network environment  
There is provided a conference bridge or transcoder configured to intelligently handle multiple speech channels in the contest of a packet network, wherein various speech channels may adhere to...
6463409 METHOD OF AND APPARATUS FOR DESIGNING CODE BOOK OF LINEAR PREDICTIVE PARAMETERS, METHOD OF AND APPARATUS FOR CODING LINEAR PREDICTIVE PARAMETERS, AND PROGRAM STORAGE DEVICE READABLE BY THE DESIGNING APPARATUS  
A code book is a set of code vectors to be selected when linear predictive parameters are vector-quantized as for an input audio which is divided into frames, each of which is further divided into...
6463406 Fractional pitch method  
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...
6456965 Multi-stage pitch and mixed voicing estimation for harmonic speech coders  
A “multi-stage” method of estimating pitch in a speech encoder (FIG. 2 ). In a first stage of the method, a set of candidate pitch values is selected, such as by using a cost function that...
6453284 Multiple voice tracking system and method  
For tracking multiple, simultaneous voices, predicted tracking is used to follow individual voices through time, even when the voices are very similar in fundamental frequency. An acoustic waveform...
6453283 Speech coding based on determining a noise contribution from a phase change  
An audio equivalent signal is coded by determining a noise value for harmonic frequencies. The noise value is determined by the change of phase of the harmonics in successive segments of the...
6427135 Method for encoding speech wherein pitch periods are changed based upon input speech signal  
A method for encoding speech wherein an input speech signal is separated by a component separator into a first component mainly constituted by speech and a second component mainly constituted by a...
6424937 Fundamental frequency pattern generator, method and program  
According to this fundamental frequency generating method, a fundamental frequency pattern is set from a data base of a fundamental frequency pattern of each accent phrase standardized by the...
6421637 Pitch shifting apparatus and method  
In a pitch shifting method, an input sound signal is stored into a memory, and a period of the input sound signal is extracted. Then, a sawtooth wave is produced whose amplitude is set to a value...
6418406 Synthesis of high-pitched sounds  
An improvement in the synthesis of high-pitched voices and sounds is provided by downshifting the pitch 11 of the original input voice or sound before LPC analysis 13. This downshifting of the...
6418407 Method and apparatus for pitch determination of a low bit rate digital voice message  
A pitch determiner ( 931 ) of a system controller ( 106 ) that generates a smoothed pitch value for a current frame of a low bit rate voice message includes a pitch function generator ( 955 ) that...
6377914 Efficient quantization of speech spectral amplitudes based on optimal interpolation technique  
A speech coding algorithm interpolates groups speech frames into speech frame pairs, and quantizes each frame of the pair according to a different algorithm. The spectral amplitudes of the second...
6370500 Method and apparatus for non-speech activity reduction of a low bit rate digital voice message  
A technique is used in a speech encoder ( 107 ) that reduces non-speech activity of a low bit rate digital voice message. Speech model parameters that include quantized speech spectral parameter...
6360198 Audio processing method, audio processing apparatus, and recording reproduction apparatus capable of outputting voice having regular pitch regardless of reproduction speed  
A reproduction part reproduced at a changeable speed ratio r. An A/D conversion part A/D converts, based on sampling frequency f i , an audio signal reproduced at a speed different from that upon...
6351729 Multiple-window method for obtaining improved spectrograms of signals  
There is disclosed a method for processing a time-varying signal to produce a high-resolution spectrogram that represents power as a function of both frequency and time. Data blocks of a time...
Matches 151 - 200 out of 466 < 1 2 3 4 5 6 7 8 9 10 >