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| Number | Title | Issue Date |
| 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.... | 02/03/2004 |
| 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 accordance with linear predictive analysis results, a pitch... | 02/03/2004 |
| 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 voice to be in an optimal pitch for voice recognition, a tar... | 02/03/2004 |
| 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 section of a large storage capacity even if the input acoustic ... | 01/13/2004 |
| 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 prototype with phase parameters generated from a reference... | 01/13/2004 |
| 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 s1 (sampled for max. pitch cycle×2) is read from a process-start position P. A ... | 01/06/2004 |
| 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 over a transmission medium. In case of lost data or receive... | 12/16/2003 |
| 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 recording medium travel speed different from the travel speed... | 12/02/2003 |
| 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 mode-selection mechanism for selecting a coding mode for the coder base... | 10/28/2003 |
| 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 data and a second remotely-located communication device which... | 10/14/2003 |
| 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 transmission (DTX) operation. The extended signal coding system cont... | 10/14/2003 |
| 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 control section for performing a pitch control of the inpu... | 09/30/2003 |
| 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 subjecting the input signal to linear prediction analysis in the f... | 07/15/2003 |
| 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 the signal to the frequency domain over a second time int... | 07/01/2003 |
| 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 difference between the pitch lag value for the current fram... | 06/24/2003 |
| 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 designed to cover the most probable points in the pitch space.... | 06/24/2003 |
| 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 adaptive codebook obtained for the previous subframe is n... | 06/17/2003 |
| 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 perceptual weighting function includes a phase information... | 06/10/2003 |
| 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 is generated on a real-time basis and approximates human ... | 06/10/2003 |
| 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 determining the pitch of a given frame, the encoding syste... | 05/13/2003 |
| 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 classification to generate tonal feature vectors (41) of the ... | 04/22/2003 |
| 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 domain representation and then identifying a specific region i... | 04/15/2003 |
| 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 sources in sound producing systems, such as machines, musica... | 04/01/2003 |
| 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 stationarity are disclosed: one that is based on time domain anal... | 03/18/2003 |
| 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 voicing determination algorithm and an algorithm for deter... | 02/25/2003 |
| 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) pre-processing of the pitch lag of a speech signal to save a lar... | 02/18/2003 |
| 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 having a sufficiently higher pitch than the original soun... | 02/11/2003 |
| 6519506 | Robot and control method for controlling the robot's emotions 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 object satisfies given conditions, based on the judgment resul... | 02/11/2003 |
| 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 object satisfies given conditions, based on the judgment resul... | 01/28/2003 |
| 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 electrical signal, extracting pitch values from the electrical si... | 01/21/2003 |
| 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 coefficients for the synthesis filter. The subframes are categ... | 01/21/2003 |
| 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 case is to carry out a harmonic analysis of the input signals i... | 01/07/2003 |
| 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 energy maximums defines a speech pitch period. Typically, ... | 11/12/2002 |
| 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 scans the range of possible time lags T and computes for eac... | 10/22/2002 |
| 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 buffer. A search range-determining portion determines a ran... | 10/22/2002 |
| 6466903 | Simple and fast way for generating a harmonic signal A fast and accurate method for generating a sampled version of the signal ##EQU1## is achieved by retrieving from memory a pre-computed phase delay value corresponding to $c;k for a given fundamental frequency, expressed in numbers of sample... | 10/15/2002 |
| 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 variety of speech encoding standards. For example, the confer... | 10/08/2002 |
| 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 sampling period pitch period determination.... | 10/08/2002 |
| 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 sub frames. A code book designing method is provided with:... | 10/08/2002 |
| 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 operates on said speech signal (steps 21-23). In a second stage of ... | 09/24/2002 |
