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7302386 |
Focused search method of fixed codebook and apparatus thereof
There are provided a search method of a fixed codebook, and more particularly, a focused search method and apparatus thereof, for being applied to a speech codec for Voice over Internet Protocol...
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7302385 |
Speech restoration system and method for concealing packet losses
Provided are a speech restoration system and method for concealing packet losses. The system includes a demultiplexer that demultiplexes an input bit stream and divides the input bit stream into...
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7299174 |
Speech coding apparatus including enhancement layer performing long term prediction
To implement scalable coding, a base layer coding section encodes an input signal to obtain base layer coded information, which is decoded by a base layer decoding section to obtain a base layer...
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7295974 |
Encoding in speech compression
Linear predictive system with classification of LP residual Fourier coefficients into two or more overlapping classes, and each class has its own vector quantization codebook(s). The use of strong...
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7289953 |
Apparatus and method for speech coding
A speech encoder includes an LPC synthesizer that obtains synthesized speech by filtering an adaptive excitation vector and a stochastic excitation vector stored in an adaptive codebook and in a...
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7283955 |
Source coding enhancement using spectral-band replication
The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction ( 101 ) prior to or in the encoder ( 103 ),...
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7283068 |
Binary decoders in electronic integrated circuits
An improved binary decoder incorporating a selection circuit that activates a selected output corresponding to a input binary value, and a deselecting circuit coupled to each output that...
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7280960 |
Sub-band voice codec with multi-stage codebooks and redundant coding
Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information...
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7280959 |
Indexing pulse positions and signs in algebraic codebooks for coding of wideband signals
The indexing method comprises forming a set of tracks of pulse positions, restraining the positions of the non-zero-amplitude pulses of the combinations of the codebook in accordance with the set...
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7277916 |
Dynamic translation between data network-based protocol in a data-packet-network and interactive voice response functions of a telephony network
A system for emulating interaction with an interactive voice response unit is provided. The system comprises, a client node connected to the network, the client node soliciting interaction with the...
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7272555 |
Fine granularity scalability speech coding for multi-pulses CELP-based algorithm
A method for speech processing in a code excitation linear prediction (CELP) based speech system having a plurality of modes including at least a first mode and a consecutive second mode. The...
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7272557 |
Method and apparatus for quantizing model parameters
A method of quantizing a model parameter includes applying the model parameter to a non-linear scaling function to produce a scaled model parameter and quantizing the scaled model parameter to form...
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7272553 |
Varying pulse amplitude multi-pulse analysis speech processor and method
A speech signal processing approach modifies the amplitudes of pulses within a multi-pulse sequence to improve and/or modify the perceived quality of reconstructed speech. According to one...
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7272554 |
Reduction of speech quality degradation caused by packet loss
A speech decoding device is provided is capable of reducing degradation of speech quality caused by concealment processing performed when a loss of a packet has occurred, e.g., in speech packet...
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7269554 |
Method, apparatus, and system for efficient rate control in audio encoding
According to one aspect of the invention, a method is provided in which audio samples representing an input audio signal are received. The input audio samples are transformed into a vector of...
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7269553 |
Pseudo-cepstral adaptive short-term post-filters for speech coders
Methods and systems for filtering synthesized or reconstructed speech are implemented. A filter based on a set of linear predictive coding (LPC) coefficients is constructed by transforming the LPC...
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7269552 |
Quantizing speech signal codewords to reduce memory requirements
For the coding or decoding of speech signal sampled values, the values contained in the code books/code tables for the generation of the speech signal parameters are stored in quantized form. The...
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7266496 |
Speech recognition system
The present invention discloses a complete speech recognition system having a training button and a recognition button, and the whole system uses the application specific integrated circuit (ASIC)...
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7263481 |
Method and apparatus for improved quality voice transcoding
A method and apparatus for a voice transcoder that converts a bitstream representing frames of data encoded according to a first voice compression standard to a bitstream representing frames of...
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7263480 |
Multi-channel signal encoding and decoding
A multi-channel linear predictive analysis-by-synthesis signal encoding method determines (S 1 ) a leading channel and encodes the leading channel as an embedded bitstream. Thereafter trailing...
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7260522 |
Gain quantization for a CELP speech coder
There is provided a speech encoding system that receives a speech signal. The speech encoding system comprises a frame processor for processing a frame of the speech signal, where the frame...
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7260521 |
Method and device for adaptive bandwidth pitch search in coding wideband signals
An improved pitch search method and device for digitally encoding a wideband signal, in particular but not exclusively a speech signal, in view of transmitting, or storing, and synthesizing this...
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7254533 |
Method and apparatus for a thin CELP voice codec
An apparatus and method for encoding and decoding a voice signal. The apparatus includes an encoder configured to generate an output bitstream signal from an input voice signal. The output...
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7251598 |
Speech coder/decoder
A coding parameter control circuit 31 computes a frame length from a bit rate and coding delay, and provides the computed frame length data to a CELP coding circuit 32. Based on the computed...
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7249014 |
Apparatus, methods and articles incorporating a fast algebraic codebook search technique
An efficient method for codebook search, employed in speech coding, uses an optimal pulse-position grouping and a split track arrangement, based on a likelihood estimator. Also disclosed are...
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7246057 |
System for handling variations in the reception of a speech signal consisting of packets
The present invention relates to a receiver system in a communication system supporting packet-based communication (e.g., an IP-network), including a receiver, speech decoder and a jitter buffer...
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7243064 |
Signal processing of multi-channel data
An approach for providing non-commutative approaches to signal processing. Quaternions are used to represent multi-dimensional data (e.g., three- and four-dimensional data). Additionally, a linear...
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7240014 |
Audio signal processing apparatus
In an audio signal encoding apparatus, a first audio signal and a second audio signal are added into an addition-result signal. The first audio signal is subtracted from the second audio signal to...
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7231344 |
Method and apparatus for gradient-descent based window optimization for linear prediction analysis
The shape of windows used during linear predictive analysis can be optimized through the use of gradient-descent based window optimization procedures. Window optimization may be achieved fairly...
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7228274 |
Recognition of identification patterns
The invention relates to a method and to a device for identifying markers in data blocks. The method is characterized in that a number of data blocks ( 201 a 201 n ) are received by a receiver (...
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7228272 |
Continuous time warping for low bit-rate CELP coding
A signal modification technique facilitates compact voice coding by employing a continuous, rather than piece-wise continuous, time warp contour to modify an original residual signal to match an...
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7209878 |
Noise feedback coding method and system for efficiently searching vector quantization codevectors used for coding a speech signal
A system for performing a computationally efficient method of searching through N Vector Quantization (VQ) codevectors for a preferred one of the N VQ codevectors predicts a speech signal to derive...
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7206740 |
Efficient excitation quantization in noise feedback coding with general noise shaping
In a Noise Feedback Coding (NFC) system operable in a ZERO-STATE condition and a ZERO-INPUT condition, the NFC system including at least one filter having a filter memory, a method of updating the...
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7200552 |
Gradient descent optimization of linear prediction coefficients for speech coders
An optimization algorithm is provided for linear prediction based speech coding systems. The optimization algorithm minimizes the error between original speech samples and synthesized speech...
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7200557 |
Method of reducing index sizes used to represent spectral content vectors
A method identifies a codeword to represent a vector derived from an audio signal by applying the vector to first and second decision trees. The first decision tree is associated with a first type...
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7197454 |
Audio coding
Coding of an audio signal is provided where the coded bitstream semantics and syntax are not related to a specific sampling frequency. Thus, all bitstream parameters required to regenerate the...
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7194408 |
CELP encoding/decoding method and apparatus
A multi-codebook fixed bitrate CELP signal block encoder/decoder includes a codebook selector ( 22 ) for selecting, for each signal block, a corresponding codebook identification in accordance with...
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7194407 |
Audio coding method and apparatus
A method of coding an audio signal comprises receiving an audio signal x to be coded and transforming the received signal from the time to the frequency domain. A quantised audio signal {tilde over...
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7191121 |
Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching
The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope...
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7191120 |
Speech encoding method, apparatus and program
A speech encoding method, apparatus and program wherein an input speech signal is divided into a plurality of frames each having a predetermined length, each of the frames is subdivided into a...
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7184953 |
Transcoding method and system between CELP-based speech codes with externally provided status
An apparatus for processing CELP-based frames includes a first module for extracting a CELP parameter from a source codec, a second module coupled to the first module adapted to interpolate between...
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7184937 |
Signal repetition-rate and frequency-drift estimator using proportional-delayed zero-crossing techniques
Proportional-delayed zero-crossing frequency-drift estimator devices are provided. Given N-number of time samples, the current zero-crossing time estimation technique uses only two zero-crossing...
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7181402 |
Method and apparatus for synthetic widening of the bandwidth of voice signals
The invention provides a method and an apparatus for synthetic widening of the bandwidth of voice signals. This is done by providing a narrowband voice signal at a predetermined sampling rate;...
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7171354 |
Audio decoder and coding error compensating method
When an error is detected in coded data in the current frame, data separation section 201 separates the data into coding parameters first. Then, mode information decoding section 202 outputs...
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7162419 |
Method in the decompression of an audio signal
The invention relates to a method in the decompression of a compressed audio signal. In the decompression, a predicting coding has been used, wherein samples taken of the audio signal have been...
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7155387 |
Noise spectrum subtraction method and system
A method for reducing noise in a voice signal, and a voice operated system utilizing the same are presented. A noise component in a compressed digital signal representative of the voice signal is...
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7152032 |
Voice enhancement device by separate vocal tract emphasis and source emphasis
A voice intensifier capable of reducing abrupt changes in the amplification factor between frames and realizing excellent sound quality with less noise feeling by dividing input voices into the...
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7149683 |
Method and device for robust predictive vector quantization of linear prediction parameters in variable bit rate speech coding
The present invention relates to a method and device for quantizing linear prediction parameters in variable bit-rate sound signal coding, in which an input linear prediction parameter vector is...
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7146311 |
CELP encoding/decoding method and apparatus
A multi-codebook fixed bitrate CELP signal block encoder/decoder includes a codebook selector ( 22 ) for selecting, for each signal block, a corresponding codebook identification in accordance with...
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7143030 |
Parametric compression/decompression modes for quantization matrices for digital audio
Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization...
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