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7619995 |
Transcoders and mixers for voice-over-IP conferencing
Transcoders and mixers having reduced algorithmic delay and processing complexity. An improved mixer for signals having encoded speech parameters wherein the parameters obtained through decoding...
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7617097 |
Scalable lossless audio coding/decoding apparatus and method
A scalable lossless audio coding/decoding apparatus and method are provided. The scalable lossless audio coding apparatus includes a lossy coding unit which lossy codes an input audio signal and...
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7617096 |
Robust quantization and inverse quantization using illegal space
A quantizer for quantization of a vector comprises a codevector generator that generates a set of candidate codevectors and a memory for storing an illegal space definition representing illegal...
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7613605 |
Audio signal encoding apparatus and method
An audio signal encoding apparatus includes a frame dividing unit ( 1 ), an auditory psychological arithmetic unit ( 2 ), a filter bank unit ( 3 ), a scale factor calculation unit ( 4 ) which...
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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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7606702 |
Speech decoder, speech decoding method, program and storage media to improve voice clarity by emphasizing voice tract characteristics using estimated formants
A code separation/decoding unit restores a vocal tract characteristic sp 1 and a vocal source signal r 1 . A vocal tract characteristic modification unit modifies the vocal tract characteristic sp...
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7599834 |
Method and apparatus of voice mixing for conferencing amongst diverse networks
A conferencing system is provided that utilizes both time domain signal mixing and direct signal fast transcoding. An exemplary embodiment of the present invention utilizes both time domain signal...
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7599833 |
Apparatus and method for coding residual signals of audio signals into a frequency domain and apparatus and method for decoding the same
Provided is a residual signal coding/decoding apparatus and method. The residual signal coding apparatus includes a transformer, an LPC coefficient extractor, an LPC coefficient quantizer, an LP...
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7599832 |
Method and device for encoding speech using open-loop pitch analysis
The present invention is a synthetic speech encoding device that produces a synthetic speech signal which closely matches an actual speech signal. The actual speech signal is digitized, and...
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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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7596490 |
Low bit-rate audio encoding
In a sinusoidal audio encoder a number of sinusoids are estimated per audio segment. A sinusoid is represented by frequency, amplitude and phase. The invention uses a track dependent quantization...
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7596489 |
Transmission error concealment in an audio signal
A method of concealing transmission error in a digital audio signal in which a signal that has been decoded after transmission is received, the samples decoded while the transmitted data is valid...
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7596488 |
System and method for real-time jitter control and packet-loss concealment in an audio signal
An “adaptive audio playback controller” operates by decoding and reading received packets of an audio signal into a signal buffer. Samples of the decoded audio signal are then played out of the...
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7593847 |
Pitch detection method and apparatus
A pitch detection method and apparatus, the pitch detection apparatus includes: a data rearrangement unit which rearranges voice data on the basis of a center peak of the voice data included in a...
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7590532 |
Voice code conversion method and apparatus
It is so arranged that a voice code can be converted even between voice encoding schemes having different subframe lengths. A voice code conversion apparatus demultiplexes a plurality of code...
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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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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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7587314 |
Single-codebook vector quantization for multiple-rate applications
This invention relates to a method, a device and a software application product for N-level quantization of vectors, wherein N is selectable prior to said quantization from a set of at least two...
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7587313 |
Audio coding
The method creates an audio stream comprising tracks of sinusoidal components linked across a plurality of sequential time segments. Segments in each track are weighted with a normal window (WI, W...
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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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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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7574351 |
Arranging CELP information of one frame in a second packet
Packets of real-time information are sent with a source rate greater than zero kilobits per second, and a time or path or combined time/path diversity rate initially being zero kilobits per second....
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7562021 |
Modification of codewords in dictionary used for efficient coding of digital media spectral data
Coding of spectral data by representing certain portions of the spectral data as a scaled version of a code-vector, where the code-vector is chosen from either a fixed predetermined codebook or a...
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7558728 |
Method and device for encoding speech using open-loop pitch analysis
The present invention is a synthetic speech encoding device that produces a synthetic speech signal which closely matches an actual speech signal. The actual speech signal is digitized, and...
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7548853 |
Scalable compressed audio bit stream and codec using a hierarchical filterbank and multichannel joint coding
A method for compressing audio input signals to form a master bit stream that can be scaled to form a scaled bit stream having an arbitrarily prescribed data rate. A hierarchical filterbank...
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7548852 |
Quality of decoded audio by adding noise
The present invention relates to a method of encoding and decoding an audio signal. The invention further relates to an arrangement for encoding and decoding an audio signal. The invention further...
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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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7546237 |
Bandwidth extension of narrowband speech
A system extends the bandwidth of a narrowband speech signal into a wideband spectrum. The system includes a high-band generator that generates a high frequency spectrum based on a narrowband...
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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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7539615 |
Audio signal quality enhancement in a digital network
The invention relates to a network element ( 1 ) and a method for enhancing the quality of digitised analogue signals transmitted in parameterised coded form via a digital network. In order to...
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7536305 |
Mixed lossless audio compression
A mixed lossless audio compression has application to a unified lossy and lossless audio compression scheme that combines lossy and lossless audio compression within a same audio signal. The mixed...
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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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7523032 |
Speech coding method, device, coding module, system and software program product for pre-processing the phase structure of a to be encoded speech signal to match the phase structure of the decoded signal
The invention relates to a method for use in parametric speech coding. In order to enable an improved parametric coding of speech signals, the method comprises a first step of pre-processing a to...
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7519532 |
Transcoding EVRC to G.729ab
Transcoding from EVRC to G.729ab with LSP parameters interpolated from EVRC to G.729ab, EVRC pitch used as input to G.729ab closed-loop pitch search, and G.729ab fixed codebook pulses found from a...
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7516230 |
Method and device for the generation or decoding of a scalable data stream with provision for a bit-store, encoder and scalable encoder
In a method for generating a scalable data stream, when a block of output data of a first encoder is present, this block of output data is written into the scalable data stream. If output data of a...
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7516066 |
Audio coding
According to a first aspect of the invention, at least part of an audio signal is coded in order to obtain an encoded signal, the coding comprising predictive coding the at least part of the audio...
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7512535 |
Adaptive postfiltering methods and systems for decoding speech
A filter controller processes a decoded speech (DS) signal. The DS signal has a spectral envelope including a first plurality of formant peaks having different respective amplitudes. The controller...
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7512534 |
Optimized windows and methods therefore for gradient-descent based window optimization for linear prediction analysis in the ITU-T G.723.1 speech coding standard
Primary and alternate optimization procedures are used to improve the ITU-T G.723.1 speech coding standard (the “Standard”) by replacing the Hamming window of the Standard with an optimized...
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7505899 |
Speech code sequence converting device and method in which coding is performed by two types of speech coding systems
A voice code sequence converting device and method for converting a code sequence with low computational complexity by receiving a first code sequence having a pitch period at an input terminal on...
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7502734 |
Method and device for robust predictive vector quantization of linear prediction parameters in sound signal coding
The exemplary embodiments of this invention relate to a method and device for quantizing linear prediction parameters in variable bit-rate sound signal coding, in which an input linear prediction...
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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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7496506 |
Method and apparatus for one-stage and two-stage noise feedback coding of speech and audio signals
Codec structures for achieving two-stage prediction and two-stage noise spectral shaping at the same time, resulting in a Two-Stage Noise Feedback Coding (TSNFC) method. One approach combines two...
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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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7493255 |
Generating LSF vectors
To alleviate problems of signal aliasing and to reduce complexity, Linear Predictive Coefficients (LPCS) are calculated from samples of audio signals and Line Spectral Frequency (LSF) vectors are...
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7490036 |
Adaptive equalizer for a coded speech signal
A speech communication system provides a speech encoder that generates a set of coded parameters representative of the desired speech signal characteristics. The speech communication system also...
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7486719 |
Transcoder and code conversion method
A two-way conversion transcoder comprising a spectrum parameter calculation circuit that calculates a spectrum parameter for a signal produced by decoding a first code; a coefficient calculation...
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