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7613607 |
Audio enhancement in coded domain
Method and apparatus for enhancing a coded audio signal comprising indices which represent audio signal parameters which comprise at least a first parameter representing a first characteristic of...
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7606711 |
Audio signal processing device, signal recovering device, audio signal processing method and signal recovering method
The pitch extracting part generates a pitch waveform signal in a manner making the time interval of the pitch of the input audio sound data to be the same. After the number of samples in each...
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7606703 |
Layered celp system and method with varying perceptual filter or short-term postfilter strengths
Layered code-excited linear prediction (CELP) speech encoders have progressively weaker perceptual weighting filters for each of the successive enhancement layers and decoders have progressively...
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7596493 |
System and method for supporting multiple speech codecs
A method for performing a search of a codebook is provided. The codebook includes a plurality of tracks each having a plurality of even pulse positions. The method includes partitioning a...
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7596492 |
Apparatus and method for concealing highband error in split-band wideband voice codec and decoding
An apparatus for concealing a highband error in a spilt-band wideband voice codec in accordance with the present invention is disclosed. The apparatus includes: a lowband LPC coefficient extracting...
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7596491 |
Layered CELP system and method
Layered (embedded) code-excited linear prediction (CELP) speech encoders/decoders with adaptive plus algebraic codebooks applied in each layer with fixed codebook pulses of one layer used in higher...
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7593848 |
Auto-correlators with DC and CW cancellation
Embodiments of methods and means for correcting auto-correlated wireless signal samples are provided. Such embodiments include isolating and subtracting an interference vector from auto-correlated...
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7590527 |
Speech coder using an orthogonal search and an orthogonal search method
A code excited linear prediction speech decoder includes an adaptive codebook configured to generate an adaptive code vector. The decoder also includes a random codebook configured to generate a...
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7590096 |
Method and apparatus for improved detection of rate errors in variable rate receivers
A system and method for detection of rate determination algorithm errors in variable rate communications system receivers. The disclosed embodiments prevent rate determination algorithm errors from...
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7587315 |
Concealment of frame erasures and method
A decoder for code excited LP encoded frames with both adaptive and fixed codebooks; erased frame concealment uses repetitive excitation plus a smoothing of pitch gain in the next good frame, plus...
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7577567 |
Multimode speech coding apparatus and decoding apparatus
Square sum calculator 603 calculates a square sum of evolution in smoothed quantized LSP parameter for each order. A first dynamic parameter is thereby obtained. Square sum calculator 605 ...
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7577566 |
Method for encoding sound source of probabilistic code book
A stochastic codebook associates a pulse position of a predetermined channel with a pulse position of another channel, searches for a pulse position by means of a predetermined algorithm, and...
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7574354 |
Transcoding between the indices of multipulse dictionaries used in compressive coding of digital signals
The invention relates to compressive transcoding between pulse coders using multipulse dictionaries in which each pulse occupies a position marked by an index. For each current pulse position...
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7571094 |
Circuits, processes, devices and systems for codebook search reduction in speech coders
An electronic circuit includes storage circuitry and a speech coder coupled with the storage circuitry to have a codebook with sets of track location numbers for respective pulses, the speech coder...
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7546239 |
Speech coder and speech decoder
A dispersed vector generator used for a speech encoder or a speech decoder includes a pulse vector provider that provides a pulse vector having a signed unit pulse on one element of a vector axis....
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7542898 |
Pitch cycle search range setting apparatus and pitch cycle search apparatus
An apparatus sets a pitch cycle search object in pitch cycle search processing for searching for a pitch cycle included in a linear predictive residual on a per subframe basis. A pitch cycle...
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7536298 |
Method of comfort noise generation for speech communication
An embodiment of the invention improves upon the International Telecommunication Union's ITU-T G.729 Annex B comfort noise generation algorithm by reducing the computational complexity of the...
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7529663 |
Method for flexible bit rate code vector generation and wideband vocoder employing the same
Provided are a flexible bit rate code vector generation method and a wideband vocoder employing the same. This invention implements a flexible bit rate by getting three code vectors which are...
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7529662 |
LPC-to-MELP transcoder
A method for transcoding a bit stream encoded according to a linear predictive coding (LPC) standard to a bit stream encoded according to a mixed-excitation linear prediction (MELP) standard,...
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7519533 |
Fixed codebook searching apparatus and fixed codebook searching method
A fixed codebook searching apparatus which slightly suppresses an increase in the operation amount, even if the filter applied to the excitation pulse has the characteristic that it cannot be...
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7499853 |
Speech decoder and code error compensation 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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7496505 |
Variable rate speech coding
A method and apparatus for the variable rate coding of a speech signal. An input speech signal is classified and an appropriate coding mode is selected based on this classification. For each...
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7496504 |
Method and apparatus for searching for combined fixed codebook in CELP speech codec
Provided are a combined, fixed codebook searching method and apparatus used in a code excited linear prediction (CELP) speech codec. The method is used in a code excited linear prediction (CELP)...
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7493256 |
Method and apparatus for high performance low bit-rate coding of unvoiced speech
A low-bit-rate coding technique for unvoiced segments of speech, without loss of quality compared to the conventional Code Excited Linear Prediction (CELP) method operating at a much higher bit...
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7478042 |
Speech decoder that detects stationary noise signal regions
A first determiner 121 tentatively determines whether the current processing unit represents a stationary noise period, based on stationary properties of a decoded signal. Based on the tentative...
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7472056 |
Transcoder for speech codecs of different CELP type and method therefor
A transcoder for use between speech codecs using different Code-Excited Linear Prediction (CELP) type and a method therefor are disclosed. The transcoder includes a decoding unit of an input CELP...
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7467083 |
Data processing apparatus
The present invention relates to a data processing apparatus capable of obtaining high-quality sound data. A tap generation section 121 generates a prediction tap used for a process in a...
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7457744 |
Method of estimating pitch by using ratio of maximum peak to candidate for maximum of autocorrelation function and device using the method
A device and a method for estimating an open-loop pitch in a general speech CODEC are disclosed. The open-loop pitch estimation device includes an autocorrelation function calculation unit which...
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7454332 |
Gain constrained noise suppression
A gain-constrained noise suppression for speech more precisely estimates noise, including during speech, to reduce musical noise artifacts introduced from noise suppression. The noise suppression...
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7454328 |
Speech encoding system, and speech encoding method
A speech encoding apparatus calculates encoding distortion of a noise-like fixed code vector and multiplies the encoding distortion by a fixed weight corresponding to the noise-like degree of the...
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7412381 |
Method and apparatus for diversity control in multiple description voice communication
A method and apparatus for performing multiple descriptive source coding in which a plurality of homogeneous encoders are advantageously employed in combination with a corresponding plurality of...
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7403894 |
Annotating programs for automatic summary generations
Audio/video programming content is made available to a receiver from a content provider, and meta data is made available to the receiver from a meta data provider. The meta data corresponds to the...
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7398206 |
Speech coding apparatus and speech decoding apparatus
First codebook and second codebook respectively have two subcodebooks, and in respective codebooks, addition sections obtain respective excitation vectors by adding sub-excitation vectors fetched...
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7398205 |
Code excited linear prediction speech decoder and method thereof
An excitation vector generator includes an input vector providing system that is capable of providing an input vector having at least one pulse, each pulse having a predetermined position and a...
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7392180 |
System and method of coding sound signals using sound enhancement
A system and method of processing sound signals are disclosed. In one embodiment, a speech coder applies a first sound signal enhancement process to a first part of a sound signal and applies a...
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7389227 |
High-speed search method for LSP quantizer using split VQ and fixed codebook of G.729 speech encoder
A high-speed search method in a speech encoder using an order character of LSP (Line Spectrum Pair) parameters in an LSP parameter quantizer using SVQ (Split Vector Quantization) used in a...
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7386444 |
Hybrid speech coding and system
Hybrid linear predictive speech coding system with phase alignment predictive quantization zero phase alignment of speech prior to waveform coding aligns synthesized speech frames of a waveform...
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7383177 |
Method for speech coding, method for speech decoding and their apparatuses
A high quality speech is reproduced with a small data amount in speech coding and decoding for performing compression coding and decoding of a speech signal to a digital signal. In speech coding...
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7373298 |
Apparatus and method for coding excitation signal
An excitation signal coding apparatus capable of improving an error resilience by changing an excitation vector search method (more specifically, an error minimization criterion during a search)....
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7369543 |
System and method for providing internet based phone conferences using multiple codecs
A method of communicating digitized speech from a transmitting forum participant comprises the step of receiving a data structure that includes said digitized speech. The data structure is analyzed...
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7366461 |
Method and apparatus for improving the quality of a recorded broadcast audio program
Recordings of broadcast audio content often contain errors (e.g., noise, signal loss, interference, talkover). A method and apparatus are provided for improving the quality of such a recording....
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7353168 |
Method and apparatus to eliminate discontinuities in adaptively filtered signals
A method to eliminate discontinuities in an adaptively filtered signal includes filtering a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a...
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7330814 |
Wideband speech coding with modulated noise highband excitation system and method
A speech encoder/decoder for wideband speech with a partitioning of wideband into lowband and highband, convenient coding of the lowband, and LP excited by noise plus some periodicity for the...
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7315815 |
LPC-harmonic vocoder with superframe structure
An enhanced low-bit rate parametric voice coder that groups a number of frames from an underlying frame-based vocoder, such as MELP, into a superframe structure. Parameters are extracted from the...
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7302387 |
Modification of fixed codebook search in G.729 Annex E audio coding
ITU Recommendation G.729 Annex E teaches in the implementation of a fixed codebook search to determine the selected sample combination providing the minimal difference between the original input...
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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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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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7283961 |
High-quality speech synthesis device and method by classification and prediction processing of synthesized sound
There is disclosed a speech processing device in which prediction taps for finding prediction values of the speech of high sound quality are extracted from the synthesized sound obtained on...
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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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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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