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6408268 Voice encoder, voice decoder, voice encoder/decoder, voice encoding method, voice decoding method and voice encoding/decoding method  
When input speech is separated into a spectrum-envelope information and an excitation signal, and the excitation signal is encoded at each frame based on a plurality of excitation signal positions...
6408267 Method for decoding an audio signal with correction of transmission errors  
The decoder receives a bit stream representative of an audio signal, with a flag indicating any missing frames. For each frame, an excitation signal is formed from excitation parameters recovered...
6397176 Fixed codebook structure including sub-codebooks  
A speech encoding comb codebook structure for providing good quality reproduced low bit-rate speech signals in a speech encoding system. The codebook structure requires minimal training, if any,...
6389388 Encoding a speech signal using code excited linear prediction using a plurality of codebooks  
A speech signal is encoded using code excited linear prediction for use in transmitting the speech signal to a receiver. The speech signal is sampled. A current sample of the speech signal is...
6385573 Adaptive tilt compensation for synthesized speech residual  
A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6377917 System and methodology for prosody modification  
A prosody modification system and methodology calculates synchronization marks in an original, quasi-periodic signal to a finer precision than the sampling rate of the original signal. Synthetic...
6363341 Encoder for minimizing resulting effect of transmission errors  
A transmission system comprising a transmitter with a signal encoder, the signal encoder having an input for a signal to be encoded and a codebook entry selector for selecting a codebook entry for...
6363340 Transmission system with improved speech encoder  
A speech transmission system with an input speech signal applied to a speech encoder for encoding the speech signal which is transmitted via a communication channel to a speech decoder. Background...
6363342 System for developing word-pronunciation pairs  
An editing tool is provided for developing word-pronunciation pairs based on a spelled word input. The editing tool includes a transcription generator that receives the spelled word input from the...
6345255 Apparatus and method for coding speech signals by making use of an adaptive codebook  
An audio signal encoding device is provided including an input for receiving a sub-frame of an audio signal to be encoded, an adaptive codebook and a processing unit. The adaptive codebook stores...
6339757 Bit allocation method for digital audio signals  
When determining a quantization for digital audio signals having a spectral and temporal structure wherein the audio signals are buffered in frames and decomposed into spectral components, the...
6330533 Speech encoder adaptively applying pitch preprocessing with warping of target signal  
A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6330535 Method for providing excitation vector  
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in...
6327562 Method and device for coding an audio signal by "forward" and "backward" LPC analysis  
A method and device for encoding a digital audio-signal divided into a succession of blocks according to a LPC "forward" and "backward" analysis respectively under a choice criterion. For coding...
6304843 Method and apparatus for reconstructing a linear prediction filter excitation signal  
An apparatus and method of reconstructing a linear prediction synthesis filter excitation signal, by: receiving a signal representative of output from a linear prediction synthesis filter,...
6298322 Encoding and synthesis of tonal audio signals using dominant sinusoids and a vector-quantized residual tonal signal  
Tonal audio signals can be modeled as a sum of sinusoids with time-varying frequencies, amplitudes, and phases. An efficient encoder and synthesizer of tonal audio signals is disclosed. The encoder...
6295520 Multi-pulse synthesis simplification in analysis-by-synthesis coders  
Speech is synthesized by optimizing frame data containing an excitation signal and impulse response filter coefficients, and convolving the excitation signal and impulse response filter...
6292777 Phase quantization method and apparatus  
A phase quantization method and apparatus in which the phase information of the input signal such as at the time of the sinusoidal synthesis encoding can be quantized efficiently. The phase of the...
6292776 Hierarchial subband linear predictive cepstral features for HMM-based speech recognition  
A method and apparatus for first training and then recognizing speech. The method and apparatus use subband cepstral features to improve the recognition string accuracy rates for speech inputs.
6289307 Codebook preliminary selection device and method, and storage medium storing codebook preliminary selection program  
Prior to deriving precise evaluation values for evaluating errors between synthetic signal vectors and a target signal vector, simple evaluation values are derived. Based on the simple evaluation...
6272460 Method for implementing a speech verification system for use in a noisy environment  
A method for implementing a speech verification system for use in a noisy environment comprises the steps of generating a confidence index for an utterance using a speech verifier, and controlling...
6272459 Voice signal coding apparatus  
A voice signal coding apparatus includes: a voice status detector detecting whether an input signal divided at predetermined frame intervals is a voice or a non-voice signal; a linear predictive...
6266632 Speech decoding apparatus and speech decoding method using energy of excitation parameter  
The speech decoding apparatus decodes a speech signal that is coded into a plurality of speech parameters including an excitation parameter, using the excitation parameter. The controller controls...
6249762 Method for separation of data into narrowband and broadband time series components  
A method for separation of acoustical data into narrowband and broadband time series components includes the steps of: constructing a data matrix in which time series samples of acoustical data are...
6240385 Methods and apparatus for efficient quantization of gain parameters in GLPAS speech coders  
In methods and apparatus for encoding a gain parameter in a generalized linear predictive analysis-by-synthesis (GLPAS) coder, a subframe gain parameter is determined for each of a plurality of...
6240382 Efficient codebook structure for code excited linear prediction coding  
A speech communication system using a code excited linear prediction speech decoder. The decoder using a first codebook containing a first digital value sequence selected from the set of binary...
6240386 Speech codec employing noise classification for noise compensation  
A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6236961 Speech signal coder  
The spectral or pitch parameters of a speech signal are quantized, and impulse responses thereof are predicted by using a filter. An orthogonal transform is made of the speech signal, or a signal...
6233553 Method and system for automatically determining phonetic transcriptions associated with spelled words  
New entries are added to the lexicon by entering them as spelled words. A transcription generator, such as a decision-tree-based phoneme or morpheme transcription generator, converts each spelled...
6208957 Voice coding and decoding system  
A first CELP coding circuit receiving a signal obtained by down-sampling of an input signal by a down-sampling circuit, outputs a part of coded output to a second CELP coding circuit. The second...
6208960 Removing periodicity from a lengthened audio signal  
An audio equivalent input signal is divided into a sequence of overlapping or adjacent signal segments. A lengthened signal is synthesized by systematically maintaining or repeating respective...
6205423 Method for coding speech containing noise-like speech periods and/or having background noise  
A method of coding speech under background noise conditions or during noise-like speech periods wherein during active voice speech segments an analysis-by-synthesis method is used. However, when a...
6205130 Method and apparatus for detecting bad data packets received by a mobile telephone using decoded speech parameters  
The mobile telephone detects bad data packets by decoding speech parameters represented by the packets and comparing those speech parameters against acceptable ranges of speech parameters. If the...
6195632 Extracting formant-based source-filter data for coding and synthesis employing cost function and inverse filtering  
An iterative formant analysis, based on minimizing the arc-length of various curves, and under various filter constraints estimates formant frequencies with desirable properties for text-to-speech...
6192334 Audio encoding apparatus and audio decoding apparatus for encoding in multiple stages a multi-pulse signal  
Auxiliary multi-pulse setting circuit 130 set candidates of pulse positions so that the pulse positions to which no pulse is located are selected in auxiliary multi-pulse searching circuit 131...
6173257 Completed fixed codebook for speech encoder  
A multi-rate speech codec supports a number of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6173256 Method and apparatus for audio representation of speech that has been encoded according to the LPC principle, through adding noise to constituent signals therein  
Speech is received as a sequence of segments that are coded according to an LPC principle. The segments are reproduced for concatenated read-out in audio reproduction, by exciting an all-pole...
6167372 Signal identifying device, code book changing device, signal identifying method, and code book changing method  
A signal identifying device which can identify an input signal easily includes a pitch extracting (4Y) for extracting a pitch component of the input signal (S1), and energy calculating unit (4X)...
6144935 Tunable perceptual weighting filter for tandem coders  
A tunable perceptual weighting filter is used in tandem codecs (coder/decoders). Specific filter parameters are advantageously tuned to provide improved performance in tandeming contexts. The...
6141639 Method and apparatus for coding of signals containing speech and background noise  
A signal including speech and background noise is encoded by first decomposing the signal into speech and noise components. A first speech encoding algorithm is then used to generate codebook...
6138089 Apparatus system and method for speech compression and decompression  
The invention provides system, apparatus, and method for compressing a speech signal by decimating or removing somewhat redundant portions of the signal while retaining reference signal portions...
6122610 Noise suppression for low bitrate speech coder  
Noise is suppressed in an input signal that carries a combination of noise and speech. The input signal is divided into signal blocks, which are processed to provide an estimate of a short-time...
6108626 Object oriented audio coding  
Audio sources are coded by recognizing different classes of audio such as speech and music. The classes are used to select between coding algorithms and to provide object definitions. Objects have...
6104992 Adaptive gain reduction to produce fixed codebook target signal  
A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6101464 Coding and decoding system for speech and musical sound  
A coding and decoding system includes a first filter for representing an input signal with first linear prediction coefficients indicative of a coarse spectral distribution of the input signal, a...
6088667 LSP prediction coding utilizing a determined best prediction matrix based upon past frame information  
An input vector is supplied from an input terminal 213. A first memory 213 accumulates a codevector from a quantizer. An adder 130 adds together the codevector and a Predicted vector from a...
6081777 Enhancement of speech signals transmitted over a vocoder channel  
In a vocoder system, the receiver is arranged to emphasize at least the fundamental or lowest-frequency sinusoidal signal in response to the pitch, in a manner which provides more emphasis at lower...
6078879 Transmitter with an improved harmonic speech encoder  
In a harmonic speech encoder (16) a speech signal to be encoded is represented by a plurality of LPC parameters which are determined by a LPC parameter computer (30), a pitch value and a gain...
6073093 Combined residual and analysis-by-synthesis pitch-dependent gain estimation for linear predictive coders  
A vocoder transmitter (12) sends coded speech to a vocoder receiver (16) over a limited-bandwidth channel (14). The transmitter includes a LPC-residual-based first gain estimator (46), which gain...
6072467 Continuously variable control of animated on-screen characters  
A compact convenient hand-held, accelerometer-based computer control device is utilized to control on-screen animated characters presented by a comer-driven display in which the movement, persona,...
Matches 151 - 200 out of 345 < 1 2 3 4 5 6 7 >