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6141637 Speech signal encoding and decoding system, speech encoding apparatus, speech decoding apparatus, speech encoding and decoding method, and storage medium storing a program for carrying out the method  
A speech encoding and decoding system comprises a speech coding apparatus and a speech decoding apparatus. The speech encoding apparatus orthogonally transforms an input speech signal represented...
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...
6134518 Digital audio signal coding using a CELP coder and a transform coder  
Apparatus is described for digitally encoding an input audio signal for storage or transmission. A distinguishing parameter is measure from the input signal. It is determined from the measured...
6131083 Method of encoding and decoding speech using modified logarithmic transformation with offset of line spectral frequency  
On the basis of an autocorrelation coefficient calculated by an autocorrelation coefficient computation section from an input speech signal, an LSF computation section computes LSF parameters F(k)...
6122611 Adding noise during LPC coded voice activity periods to improve the quality of coded speech coexisting with background noise  
A system and method to improve the quality of coded speech coexisting with background noise. For instance, the present invention receives a coded speech signal via a communication network and then...
6122608 Method for switched-predictive quantization  
A new method for quantization of the LPC coefficients in a speech coder includes an improved form of switched predictive multi-stage vector quantization. The switch predictive quantization includes...
6122607 Method and arrangement for reconstruction of a received speech signal  
The present invention relates to a method and an arrangement for reconstruction of a received speech signal (r), which has been transmitted over a radio channel that has been subjected to...
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...
6119082 Speech coding system and method including harmonic generator having an adaptive phase off-setter  
A speech coding system (10) and associated method rely on a speech encoder (15) and a speech decoder (20). The speech decoder (20) includes a Linear Predictive Coding (LPC) filter (90) having an...
6113653 Method and apparatus for coding an information signal using delay contour adjustment  
An open-loop delay contour estimator (204) generates delay information during coding of an information signal. The delay contour is adjusted according to an error minimization criterion on a...
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...
6108623 Comfort noise generator, using summed adaptive-gain parallel channels with a Gaussian input, for LPC speech decoding  
A device for generating comfort noise for an LPC speech decoder which replaces silent periods with noise for a distant listener. The device includes and encoder for determining the energy...
6104996 Audio coding with low-order adaptive prediction of transients  
An encoder comprising predictive coding means for encoding electronic signals input thereto is disclosed. The predictive coding means is adapted to operate in a first high prediction order mode and...
6104998 System for coding voice signals to optimize bandwidth occupation in high speed packet switching networks  
A system for coding voice signal to optimize bandwidth occupation in a High Speed Packet Switching network while ensuring best voice transmission quality. The voice signal is first encoded using a...
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...
6098037 Formant weighted vector quantization of LPC excitation harmonic spectral amplitudes  
A method of quantizing harmonic amplitudes (FIG. 3), used in a speech encoder (10). The method compares variable dimension input vectors to fixed dimension codebook vectors, by first sampling each...
6094629 Speech coding system and method including spectral quantizer  
A speech coding system and associated method relies on a speech encoder and a speech decoder. The encoder includes a spectral quantizer for computing line spectral frequencies (LSFs) for respective...
6094630 Sequential searching speech coding device  
A speech coding device in which an excitation signal of speech signals is expressed as a sum of a plurality of pulse strings, and positions of the pulse strings are selected from predetermined...
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...
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...
6073092 Method for speech coding based on a code excited linear prediction (CELP) model  
The invention provides a method for speech coding using Code-Excited Linear Prediction (CELP) producing toll-quality speech at data rates between 4 and 16 Kbit/s. The invention uses a series of...
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...
RE36721 Speech coding and decoding apparatus  
A speech signal is input to an excitation signal generating section, a prediction filter and a prediction parameter calculator. The prediction parameter calculator calculates a predetermined number...
6067511 LPC speech synthesis using harmonic excitation generator with phase modulator for voiced speech  
A speech coding system (10) and associated method relies on a speech encoder (15) and a speech decoder (20). The speech decoder (20) includes a harmonic generator (70) which modulates the phase of...
6067518 Linear prediction speech coding apparatus  
A sample speech is analyzed by a speech analyzing unit to obtain sample characteristic parameters, and a coding distortion is calculated from the sample characteristic parameters in each of a...
6064954 Digital audio signal coding  
Apparatus is disclosed for digitally encoding an input audio signal, for storage or transmission, comprising: a pitch detector for determining at least a dominant time-domain periodicity in the...
6064956 Method to determine the excitation pulse positions within a speech frame  
A determination is made of the positions within a speech frame for a given number of excitation pulses in a linear predictive speech encoder. A combination of two known methods is used. The...
6061648 Speech coding apparatus and speech decoding apparatus  
In a speech coding apparatus, an input device inputs a mixed speech signal of a plurality of speakers. A separating device analyzes period characteristics of the input mixed speech signal, and...
6058360 Postfiltering audio signals especially speech signals  
A short-delay postfilter (13) for postfiltering an encoded or decoded audio signal, specifically a speech signal, the short-delay postfilter having a transfer function F(z) of the form...
6055496 Vector quantization in celp speech coder  
A process for generation of codevectors in the production of synthetic speech in a communication system employing code-excited linear prediction (CELP) is implemented by dividing frames of sampled...
6052659 Nonlinear filter for noise suppression in linear prediction speech processing devices  
The invention relates to a linear prediction audio signal processing apparatus, such as a vocoder, including a nonlinear filter to attenuate the residual signal used to excite a linear prediction...
RE36646 Speech coding system utilizing a recursive computation technique for improvement in processing speed  
This invention provides a novel speech coding system which recursively executes a filter-applied "Toeplitz characteristic" by causing a drive signal (i.e., an excitation signal) to be converted...
6044338 Signal processing method and apparatus and signal recording medium  
A signal processing method is provided which detects a signal dropout portion in the input signal and which modifies the detected signal dropout portion with a signal derived from the portion in...
6041297 Vocoder for coding speech by using a correlation between spectral magnitudes and candidate excitations  
A vocoder according to the present invention includes an analyzer portion and a synthesizer portion. The analyzer portion encodes an input frame of speech on the basis of a candidate excitation...
6038530 Communication network for transmitting speech signals  
In a speech communication network in which a transmitter (1) transmits speech signals via a network (4) to a receiver (8), it can happen that more traffic is offered to the network (4) than it can...
6023672 Speech coder  
An excitation quantizer 60 in a speech encoder includes a divider, which divides M pulses representing in combination a speech signal into groups each of L pulses, L being smaller than M. The...
6021385 System for detecting defective speech frames in a receiver by calculating the transmission quality of an included signal within a GSM communication system  
A method for detecting defective speech frames in a receiver of a speech communication system includes a coded speech signal consisting of speech frames conveying speech coding parameters received...
6016472 System and method for interfacing a digital audio processor to a low-speed serially addressable storage device  
A serially addressable non-volatile storage device, specifically flash memory, is usable for recording digitally compressed audio by providing a software-controlled serial interface between a...
6014621 Synthesis of speech signals in the absence of coded parameters  
A speech compression system called "Transform Predictive Coding", or TPC, provides for encoding 7 kHz wideband speech (16 kHz sampling) at a target bit-rate range of 16 to 32 kb/s (1 to 2...
6014623 Method of encoding synthetic speech  
A method of synthetic speech, wherein the method forms a speech data base, the speech data base includes plural syllables, each of the syllables having a total frame number of the syllable and...
6014620 Power spectral density estimation method and apparatus using LPC analysis  
A residual error based compensator for the frequency domain bias of an autoregressive spectral estimator is disclosed. LPC analysis is performed on the residual signal and a parametric PSD estimate...
6011846 Methods and apparatus for echo suppression  
In methods and apparatus for suppressing echo of a far end signal encoded using LPC-based compression in a near end signal encoded using LPC-based compression, parameters of each frame of the near...
6012026 Variable bitrate speech transmission system  
A transmission system with a transmitter and a receiver. The transmitter has a speech encoder with analysis means, has calculation means, and has control means. The receiver has a speech decoder....
6012024 Method and apparatus in coding digital information  
A speech encoder (100) receives speech signals (S) which are encoded and transmitted on a communication channel (120). Silence in the speech is utilized by a data encoder (101) to transmit data on...
6012025 Audio coding method and apparatus using backward adaptive prediction  
A method of coding an audio electrical signal using backward adaptive prediction. A first time frame of the audio electrical signal to be coded is received and transformed into the frequency domain...
6009395 Synthesizer and method using scaled excitation signal  
A synthesizer may synthesize speech by receiving an adaptive codebook excitation signal and an adaptive codebook gain. The adaptive codebook excitation signal may be scaled using the adaptive...
6009384 Method for coding human speech by joining source frames and an apparatus for reproducing human speech so coded  
For coding human speech for subsequent audio reproduction thereof, a plurality of speech segments is derived from speech received, and systematically stored in a data base for later concatenated...
6006178 Speech encoder capable of substantially increasing a codebook size without increasing the number of transmitted bits  
In a speech encoder, a gain codebook switching circuit is supplied with short-term prediction gains from a short-term prediction gain calculator circuit and with mode information through an input...
6006176 Speech coding apparatus  
A speech coding apparatus which allows a speech decoding apparatus to output a more familiar background noise. The speech coding apparatus includes a voice presence/absence discrimination section,...
6003001 Speech encoding method and apparatus  
In encoding in which an adaptive codebook such as PSI-CELP or a fixed codebook is used on switching selection, waveform distortion caused by selection of the fixed codebook in case input speech...
Matches 401 - 450 out of 750 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >