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6256608 |
System and method for entropy encoding quantized transform coefficients of a signal
The coder/decoder (codec) system of the present invention includes a coder and a decoder. The coder includes a multi-resolution transform processor, such as a modulated lapped transform (MLT)...
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6240380 |
System and method for partially whitening and quantizing weighting functions of audio signals
The coder/decoder (codec) system of the present invention includes a coder and a decoder. The coder includes a multi-resolution transform processor, such as a modulated lapped transform (MLT)...
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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...
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6230125 |
Processing speech coding parameters in a telecommunication system
The present invention relates to processing speech coding parameters in a telecommunication system. The speech coding parameters of a speech frame, produced by a speech encoder, are divided into...
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6226607 |
Method and apparatus for eighth-rate random number generation for speech coders
A method and apparatus for eighth-rate random number generation for speech coders includes a random number generator configured to generate values of a first random variable. A lookup table is used...
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6219637 |
Speech coding/decoding using phase spectrum corresponding to a transfer function having at least one pole outside the unit circle
A decoder for speech signals receives magnitude spectral information for synthesis of a time-varying signal. From the magnitude spectral information, phase spectrum information is computed...
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6212495 |
Coding method, coder, and decoder processing sample values repeatedly with different predicted values
A differential pulse-code modulation coder obtains an improved signal-to-noise ratio, with only a small increase in bit rate, by repetitive coding. In one aspect, the coder divides the input signal...
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6208962 |
Signal coding system
For voice and musical signal, a signal coding system which can obtain good sound quality even at a low bit rate is provided. The signal coding system predicts an input signal in a predicting...
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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...
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6199037 |
Joint quantization of speech subframe voicing metrics and fundamental frequencies
Speech is encoded into a frame of bits. A speech signal is digitized into a sequence of digital speech samples that are then divided into a sequence of subframes. A set of model parameters is...
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6199038 |
Signal encoding method using first band units as encoding units and second band units for setting an initial value of quantization precision
A signal encoding method for encoding input digital data by high-efficiency encoding whereby acoustic signals can be encoded on a real-time basis with small-sized hardware. The spectral signal...
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6199040 |
System and method for communicating a perceptually encoded speech spectrum signal
System efficiently communicates a perceptually encoded speech spectrum signal from a transmitter to a receiver. The transmitter includes a speech analyzer which accepts a speech signal input and...
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6192353 |
Multiresolutional classifier with training system and method
An improved method and system for training and classifying using a low complexity and high accuracy multiresolutional polynomial classifier (412) is presented. A method of training an...
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6192336 |
Method and system for searching for an optimal codevector
Method and system aspects for searching for an optimal codevector from a plurality of codevectors in a codebook, the optimal codevector having a minimum distance to a given vector, are provided....
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6188980 |
Synchronized encoder-decoder frame concealment using speech coding parameters including line spectral frequencies and filter coefficients
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...
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6188987 |
Providing auxiliary information with frame-based encoded audio information
Blocks of encoded audio information are arranged in frames separated by gaps or guard bands that are aligned with frames of video information. The gaps are provided to protect the audio information...
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6182030 |
Enhanced coding to improve coded communication signals
At a transmitter of a communication system, a target signal and a primary coded signal are produced in response to an input signal. The primary coded signal is intended to match the target signal....
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6182035 |
Method and apparatus for detecting voice activity
A voice activity detector that implements a fast wavelet transformation using filter pairs. A quadrature high pass filter provides an output signal corresponding to the upper half of the Nyquist...
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6182034 |
System and method for producing a fixed effort quantization step size with a binary search
The coder/decoder (codec) system of the present invention includes a coder and a decoder. The coder includes a multi-resolution transform processor, such as a modulated lapped transform (MLT)...
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6169973 |
Encoding method and apparatus, decoding method and apparatus and recording medium
An encoding method and apparatus and a decodings method and apparatus in which the encoded information is decreased in volume and in which the encoding and decoding operations are performed with a...
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6161088 |
Method and system for encoding a digital audio signal
A method for encoding a digital audio signal includes filtering a portion of the digital audio signal into a first number of frequency ranges to produce a respective first number of filtered...
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6161089 |
Multi-subframe quantization of spectral parameters
Speech is encoded into a frame of bits. A speech signal is digitized into a sequence of digital speech samples that are then divided into a sequence of subframes. A set of model parameters is...
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6148283 |
Method and apparatus using multi-path multi-stage vector quantizer
A multi-path, split, multi-stage vector quantizer (MPSMS-VQ) having multiple paths between stages which result in a robust and flexible quanitizer. By varying parameters, the MPSMS-VQ meets design...
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6144853 |
Method and apparatus for digital cordless telephony
A method of transmitting a voice communications signal includes the steps of sampling the signal and creating digital representations of the samples. The digital representations are speech-coded to...
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6138090 |
Encoded-sound-code decoding methods and sound-data coding/decoding systems
A encoded-sound-code decoding method comprises a first step of performing a decoding process on a predetermined number of sample codes starting from a sound-reproduction start position at some...
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6131084 |
Dual subframe quantization of spectral magnitudes
Speech is encoded into a 90 millisecond frame of bits for transmission across a satellite communication channel. A speech signal is digitized into digital speech samples that are then divided into...
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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)...
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6128593 |
System and method for implementing a refined psycho-acoustic modeler
A system comprises a refined psycho-acoustic modeler for efficient perceptive encoding compression of digital audio. Perceptive encoding uses experimentally derived knowledge of human hearing to...
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6128592 |
Signal processing apparatus and method, and transmission medium and recording medium therefor
A signal processing apparatus and method decodes codes generated by encoding decomposed frequency components, and combines frequency components obtained in the decoding to form a waveform signal....
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6125348 |
Lossless data compression with low complexity
An adaptive linear predictor is used to predict samples, and residuals from such predictions are encoded using Golomb-Rice encoding. Linear prediction of samples of a signal which represents...
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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...
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6119092 |
Audio decoder bypass module for communicating compressed audio to external components
A multimedia decoder is provided with an audio decoder bypass module for forwarding undecoded audio bitstreams directly to external system components. In one embodiment, the multimedia decoder...
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6112171 |
Methods of efficiently recording and audio signal in semiconductor memory
An audio signal is recorded in a semiconductor memory in a plurality of hierarchical levels, with the lowest level being adequate for reproduction with a certain reduced degree of fidelity....
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6108625 |
Scalable audio coding/decoding method and apparatus without overlap of information between various layers
A scalable audio coding/decoding method and apparatus are provided. The coding method includes the steps of (a) signal-processing input audio signals and quantizing the same for each predetermined...
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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...
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6104991 |
Speech encoding and decoding system which modifies encoding and decoding characteristics based on an audio signal
The present invention relates to a speech encoder/decoder system employing digital transmission in which the encoding and decoding operations are complimentary, and these operations make use of...
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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...
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6094631 |
Method of signal compression
A method of signal compression. An input signal is divided into a plurality of segments. Each of the segments is decomposed by wavelet packet transform to a plurality of levels, so that each of the...
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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...
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6092041 |
System and method of encoding and decoding a layered bitstream by re-applying psychoacoustic analysis in the decoder
The invention provides a device, method (400,500,600), and system (100) to improve compression efficiency when coding audio for bitrate scalability. It includes at least one of an encoder and a...
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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...
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6085163 |
Using time-aligned blocks of encoded audio in video/audio applications to facilitate audio switching
An audio signal processor forms gaps or guard bands in sequences of blocks conveying encoded audio information and time aligns the guard bands with video information. The guard bands are formed to...
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RE36714 |
Perceptual coding of audio signals
A method is disclosed for determining estimates of the perceived noise masking level of audio signals as a function of frequency. By developing a randomness metric related to the euclidian distance...
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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...
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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...
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RE36683 |
Apparatus and method for audio data compression and expansion with reduced block floating overhead
A method for compressing a digital audio input signal to provide a recording signal in which the input signal is divided into frames comprising plural samples. Each frame is transformed into a...
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6058362 |
System and method for masking quantization noise of audio signals
The coder/decoder (codec) system of the present invention includes a coder and a decoder. The coder includes a multi-resolution transform processor, such as a modulated lapped transform (MLT)...
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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...
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6052658 |
Method of amplitude coding for low bit rate sinusoidal transform vocoder
The present invention provides a sinusoidal transform vocoder based on the Bark spectrum, which has high quality and low bit rate for coding. The present invention includes the steps of...
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6029129 |
Quantizing audio data using amplitude histogram
Quantizing optimizes compression encoding for transmission of audio data. A working set of most frequent sound levels in a sequence of audio samples is determined from a histogram. Sound levels...
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