Matches 101 - 150 out of 466 < 1 2 3 4 5 6 7 8 9 10 >
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6999919 Fast convergence method for bit allocation stage of MPEG audio layer 3 encoders  
A method for an improved QSS (bit allocator) algorithm is disclosed. The disclosed method is capable of greatly improving determination time; thereby, improving the efficiency of converting a...
6996521 Auxiliary channel masking in an audio signal  
A method is provided for embedding data into an audio signal and determining data embedded into an audio signal. In the method for embedding data into an audio signal, the audio signal is based on...
6996523 Prototype waveform magnitude quantization for a frequency domain interpolative speech codec system  
A system and method is provided that employs a frequency domain interpolative CODEC system for low bit rate coding of speech which comprises a linear prediction (LP) front end adapted to process an...
6988067 LSF quantizer for wideband speech coder  
The LSF quantizer for a wideband speech coder comprises a subtracter for receiving an input LSF coefficient vector and removing a DC component from it; a memory-based vector quantizer and a...
6985857 Method and apparatus for speech coding using training and quantizing  
A perceptually weighted speech coder system samples a speech signal and determines its pitch. The speech signal is characterized as fully voiced, partially voiced or weakly voiced. A Lloyd-Max...
6973424 Voice coder  
A speech coder capable of achieving an excellent sound quality even at a low bit rate. A mode judging circuit 800 of the speech coder judges a mode by the use of a feature quantity of an input...
6963646 Sound signal encoding apparatus and method  
A sound signal encoding apparatus for encoding two different sound signals, comprising: compression level calculating means for calculating a compression level for each of the sound signal...
6963842 Efficient system and method for converting between different transform-domain signal representations  
A memory-efficient system converting a signal from a first transform domain to a second transform domain. The system includes a first mechanism that obtains an input signal expressed via a first...
6952677 Fast frame optimization in an audio encoder  
In a transform encoder for audio data, encoded data in the form of mantissas, exponents and coupling data is packed into fixed length frames in an output bitstream. The fields within the frame for...
6950794 Feedforward prediction of scalefactors based on allowable distortion for noise shaping in psychoacoustic-based compression  
A method of encoding a digital signal, particularly an audio signal, which predicts favorable scalefactors for different frequency subbands of the signal. Distortion thresholds which are associated...
6937979 Coding based on spectral content of a speech signal  
In a coding procedure, a spectral content of a speech signal is estimated. A preferential coding algorithm or preferential value of at least one coding parameter is selected based on the estimated...
6934676 Method and system for inter-channel signal redundancy removal in perceptual audio coding  
A method and system for coding audio signals in a multi-channel sound system, wherein a plurality of MDCT units are used to reduce the audio signals for providing a plurality of MDCT coefficients....
6934679 Error resilient scalable audio coding  
A scalable audio codec processes, quantizes and encodes audio signals into an embedded audio bitstream of bit-planes each having a data unit. The data unit has a beginning refinement bits...
6931373 Prototype waveform phase modeling for a frequency domain interpolative speech codec system  
A system and method is provided that employs a frequency domain interpolative CODEC system for low bit rate coding of speech which comprises a linear prediction (LP) front end adapted to process an...
6917914 Voice over bandwidth constrained lines with mixed excitation linear prediction transcoding  
Vector quantization techniques reduce the effective bit rate to 600 bps while maintaining intelligible speech. Four frames of speech are combined into one frame. The system uses mixed excitation...
6915256 Pitch quantization for distributed speech recognition  
A system, method and computer readable medium for quantizing pitch information of audio is disclosed. The method includes capturing audio representing a numbered frame of a plurality of numbered...
6909746 Fast robust data compression method and system  
A video compression process speeds the optimal choice of quantizers for compressing a data stream by setting up the optimization problem as a path-optimization problem in configuration space and...
6873956 Multi-channel speech processor with increased channel density  
An exemplary multi-channel speech processor comprises a controller capable of interfacing with a plurality of channels, and at least one signal processing unit (SPU) coupled to the controller,...
6870848 Method and apparatus for call processing in response to a call request from an originating device  
A communication system includes a packet-based data network coupled to various network entities. The communications system includes a community that has a call processing system and various other...
6842732 Speech encoding and decoding method and electronic apparatus for synthesizing speech signals using excitation signals  
A speech encoding method of generating a synthesized speech signal by using an excitation signal generated by using an adaptive codebook storing a past excitation signal includes the steps of...
6832194 Audio recognition peripheral system  
The present invention includes a novel audio recognition peripheral system and method. The audio recognition peripheral system comprises an audio recognition peripheral a programmable processor...
6829576 Nonlinear operation method suitable for audio encoding/decoding and hardware applying the same  
A nonlinear operation method suitable for audio encoding/decoding and an applied hardware thereof. The nonlinear operation method suitable for audio encoding exists in a quantization process for...
6807312 Robust codebooks for vector quantization  
A method for data compression. An encoder receives data vectors from an original data set. The encoder uses a vector quantization codebook to encode the data vectors into encoded vectors. The...
6785655 Method for independent dynamic range control  
Different dynamic range control values are applied to the 2-channel and m-channel outputs without repeating the inverse transform or the windowing of the audio samples. First, m-channel dynamic...
6778956 Voice recording-reproducing system and voice recording-reproducing method using the same  
Code patterns are first sorted in a codebook in order of power, and catalogued while preparing fixed parameters indicating a selection range size of the code patterns (not greater than values...
6778953 Method and apparatus for representing masked thresholds in a perceptual audio coder  
A method and apparatus are disclosed for representing the masked threshold in a perceptual audio coder, using line spectral frequencies (LSF) or another representation for linear prediction (LP)...
6775649 Concealment of frame erasures for speech transmission and storage system and method  
A decoder for packetized speech with differential quantization of line spectral frequencies and fixed-codebook gain conceals erased frames with interpolation of future and past frames by...
6772112 System and method to reduce speech delay and improve voice quality using half speech blocks  
A system and method for wireless communication using half speech blocks which results in half the number of coded bits as a full speech block after coding. The half speech block can be created with...
6757649 Codebook tables for multi-rate encoding and decoding with pre-gain and delayed-gain quantization tables  
A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the...
6751586 Audio decoding device with soft decision error correction by bit interpolation  
A audio decoding device includes an error correction processing means 13 for generating interpolation process information, a soft decision information generating means 12 a for generating a...
6751585 Speech coder for high quality at low bit rates  
A speech coder for high quality coding speech signals at low bit rates is disclosed. An excitation quantization unit 12 expresses an excitation signal in terms of a combination of a plurality of...
6741960 Harmonic-noise speech coding algorithm and coder using cepstrum analysis method  
The present invention relates to a harmonic-noise speech coder and coding algorithm of the mixed signal of voiced/unvoiced sound using harmonic model. The harmonic-noise speech coder comprises a...
6735567 Encoding and decoding speech signals variably based on signal classification  
A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the...
6725192 Audio coding and quantization method  
In an audio coding and quantization method, each of spectral subband components of an audio signal is quantized whereby a quantizer step size for a related one of spectral subbands is obtained from...
6718296 Measurement of signal quality  
Apparatus for assessing the performance of telecommunications systems by comparison of a reference signal with the same signal as degraded by the system under test tends to give unreliable results...
6717990 Communication system and method for multi-rate, channel-optimized trellis-coded quantization  
A communication system ( 20 ) employs fixed rate channel-optimized, trellis-coded quantization (COTCQ) at a plurality of diverse encoding bit rates. COTCQ is performed through a COTCQ encoder ( 40...
6704705 Perceptual audio coding  
A method and apparatus for perceptual audio coding. The method and apparatus provide high-quality sound for coding rates down to and below 1 bit/sample for a wide variety of input signals including...
6697775 Audio coding method, audio coding apparatus, and data storage medium  
There is provided an audio coding method which is capable of creating coded data of high-quality with no discontinuity in real time without being affected by processing ability of a CPU on a...
6681204 Apparatus and method for encoding a signal as well as apparatus and method for decoding a signal  
An apparatus and a method for encoding an input signal on the time base through orthogonal transform involves removing the correlation of signal waveform on the basis of the parameters obtained by...
6678653 Apparatus and method for coding audio data at high speed using precision information  
An audio signal is converted from time domain into frequency conversion signal, and is coded at high speed. In order that the frequency information decoded by using the quantizing data may not be...
6658383 Method for coding speech and music signals  
The present invention provides a transform coding method efficient for music signals that is suitable for use in a hybrid codec, whereby a common Linear Predictive (LP) synthesis filter is employed...
6654716 Perceptually improved enhancement of encoded acoustic signals  
The invention relates to encoding of broadband and narrowband acoustic source signals (x) such that the perceived sound quality of corresponding reconstructed signals is improved in comparison to...
6633847 Voice activated circuit and radio using same  
A voice-activated circuit such as a VOX circuit ( 100 ) includes a quadratic detector ( 108 ). Quadratic detector ( 108 ) uses a sum of weighted instantaneous autocorrelation with multiple lags and...
6625574 Method and apparatus for sub-band coding and decoding  
An input digital audio signal is divided into sub-band signals in respective sub-bands. Scale factors of the respective sub-bands are determined on the basis of the sub-band signals for every...
6622120 Fast search method for LSP quantization  
A fast search method for LSP (Linear Spectrum Pair) quantization is provided. The fast search method in accordance with an embodiment of the present invention includes the following steps. A first...
6618700 Speech coder output transformation method for reducing audible noise  
In a cellular telephone system where a digital cellular telephone is connected to a regular telephone through the public switched telephone network (PSTN), a speech encoder/decoder is used with an...
6593872 Signal processing apparatus and method, signal coding apparatus and method, and signal decoding apparatus and method  
An apparatus and method for preventing a computation error of band-by-band bit allocation between an encoder and a decoder. In the encoder, an input LSP (line spectrum pair) coefficient is...
6584438 Frame erasure compensation method in a variable rate speech coder  
A frame erasure compensation method in a variable-rate speech coder includes quantizing, with a first encoder, a pitch lag value for a current frame and a first delta pitch lag value equal to the...
6577995 Apparatus for quantizing phase of speech signal using perceptual weighting function and method therefor  
An apparatus for quantizing the phase of a speech signal using a perceptual weighting function and a method therefor are provided. The apparatus for quantizing the phase of a speech signal using a...
6567949 Method and configuration for error masking  
For the purpose of error masking, binary representation of parameter values are precoded at the transmitting end by a linear block code before transmission over a faulty channel, and the redundant...
Matches 101 - 150 out of 466 < 1 2 3 4 5 6 7 8 9 10 >