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5664056 |
Digital encoder with dynamic quantization bit allocation
An encoder apparatus and method for compressing a digital input signal derived from an analog signal to reduce the number of bits required to represent the analog signal with low quantizing noise....
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5657350 |
Audio coder/decoder with recursive determination of prediction coefficients based on reflection coefficients derived from correlation coefficients
A coder/decoder for samples of speech or other audio signals with bit rate reduction includes an adaptive prediction filter having filter coefficients which are recursively computed according to...
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5651090 |
Coding method and coder for coding input signals of plural channels using vector quantization, and decoding method and decoder therefor
Power normalization parts calculate the average powers of input signals of a plurality of channels for each frame and divide the signals by the calculated average powers to generate normalized...
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5651093 |
Method of processing audio signal
An audio signal is coded by converting the audio signal into a signal in a frequency domain and effecting a bit allocation on the converted audio signal. A masking threshold level for reducing...
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5649054 |
Method and apparatus for coding digital sound by subtracting adaptive dither and inserting buried channel bits and an apparatus for decoding such encoding digital sound
For encoding sound received as a stream of multibit input sample, from a finite length sequence of input samples, an instantaneous audibility threshold characteristic is determined. Next, a shaped,...
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5642368 |
Error protection for multimode speech coders
A method for protecting information bits wherein input data bits, at least some of which are to be protected, are sorted based upon information determined from a subset of the input data bits. An...
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5642466 |
Intonation adjustment in text-to-speech systems
A software-only real time text-to-speech system includes intonation control which does not introduce discontinuities into output speech stream. The text-to-speech system includes a module for...
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5642383 |
Audio data coding method and audio data coding apparatus
An audio data coding method of requantizing digital audio data in accordance with the hearing sense characteristic of the human being, comprises: the steps of calculating a quantization error;...
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5636291 |
Continuous parameter hidden Markov model approach to automatic handwriting recognition
A computer-based system and method for recognizing handwriting. The present invention includes a pre-processor, a front end, and a modeling component. The present invention operates as follows....
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5633980 |
Voice cover and a method for searching codebooks
After dividing voice signals into subframes, a voice coder calculates auditory sense masking threshold values for each subframe with a masking threshold value calculating circuit, and transforms...
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5634082 |
High efficiency audio coding device and method therefore
A high efficiency encoding audio signals is disclosed. The system includes a signal energy calculating circuit for calculating allowable noise energies by utilizing characteristics of human...
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5633981 |
Method and apparatus for adjusting dynamic range and gain in an encoder/decoder for multidimensional sound fields
An audio encoder/decoder system suitable for digital motion picture film soundtracks provides for adjusting playback signal gain and dynamic range by modifying the scale factors of scaled spectral...
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5632005 |
Encoder/decoder for multidimensional sound fields
An adaptive high-fidelity perceptual subband encoder for spatially directional multichannel audio signals, using a mixture of individual-channel subband coding with subband-steered...
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5632003 |
Computationally efficient adaptive bit allocation for coding method and apparatus
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to computationally efficient adaptive bit...
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5625746 |
Method and apparatus for encoding, decoding and compression of audio-type data
An audio-type signal is encoded. The signal is first divided into bands. For each band, a yardstick signal element is selected. Its magnitude is quantized using a first level of accuracy. This...
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5623577 |
Computationally efficient adaptive bit allocation for encoding method and apparatus with allowance for decoder spectral distortions
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to computationally efficient adaptive bit...
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5621760 |
Speech coding transmission system and coder and decoder therefor
A speech coding transmission system is disclosed in which a coder of a differential coding system quantizes a difference between a predictive value from an adaptive predictor and an input speech...
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5621854 |
Method and apparatus for objective speech quality measurements of telecommunication equipment
A telecommunications testing apparatus comprising a signal generator which generates a speech-like synthetic signal, which is supplied to the input of a telecommunication apparatus to be tested....
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5617507 |
Speech segment coding and pitch control methods for speech synthesis systems
The present invention relates to a method and system for synthesizing speech utilizing a periodic waveform decomposition and relocation coding scheme. According to the scheme, signals of voiced...
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5615302 |
Filter bank determination of discrete tone frequencies
Specifically shaped filter responses enable power or amplitude measurements at the filter outputs to be simply transformed into accurate measurements of some desired function of the frequency (such...
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5606618 |
Subband coded digital transmission system using some composite signals
Reproduction accuracy of, for example a digital stereo audio signal, is improved by transmitting sample data as sub-signals such as frequency subband signals. In one or more subbands, corresponding...
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5600753 |
Speech recognition by neural network adapted to reference pattern learning
A speech recognition method according to the present invention uses distances calculated through a variance weighting process using covariance matrixes as the local distances (prediction residuals)...
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5592584 |
Method and apparatus for two-component signal compression
A method and apparatus for performing a Modified Discrete Cosine Transform on an audio signal is disclosed which utilizes a Discrete Fourier Transform. Illustratively, the MDCT spectral...
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5592583 |
Voice output device for outputting vocal instructions when the waiting time for a key input operation exceeds a set time limit
A voice output device includes a processor for setting a time limit for waiting for the performing of a key input operation. The device also includes a timer for measuring a waiting time for the...
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5583967 |
Apparatus for compressing a digital input signal with signal spectrum-dependent and noise spectrum-dependent quantizing bit allocation
An apparatus for compressing a digital audio input signal to provide a compressed output signal. A circuit derives plural spectral coefficients from the input signal and groups the spectral...
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5581654 |
Method and apparatus for information encoding and decoding
Pre-echo in the encoding and encoding of digital audio signals is diminished by utilizing a frequency dividing circuit for dividing the input audio signals into plural bands, normalization circuits...
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5579430 |
Digital encoding process
A digital encoding process for transmitting and/or storing acoustical sigs and, in particular, music signals, in which scanned values of the acoustical signal are transformed by means of a...
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5553193 |
Bit allocation method and device for digital audio signals using aural characteristics and signal intensities
A method for compression encoding of digital speech signals in which the digital speech signals are divided at a predetermined time interval into plural frequency bands so as to be sub-divided...
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5548647 |
Fixed text speaker verification method and apparatus
Speaker verification is performed by computing principal components of a fixed text statement comprising a speaker identification code and a two-word phrase, and principal spectral components of a...
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5546565 |
Input/output apparatus having a pen, and method of associating and processing handwritten image data and voice data
An input/output apparatus records both a handwritten image and a speech to facilitate the collation between the recorded image and speech. When a command recognizing section recognizes that a...
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5539858 |
Voice coding communication system and apparatus
A voice coding communication system in case of applying an adaptive differential PCM system in which a discontinuous transmitter is provided at the transmitting side to reduce its power...
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5537647 |
Noise resistant auditory model for parametrization of speech
A method and system are provided for alleviating the harmful effects of convolutional and additive noise in speech, such as due to the environmental noise and linear spectral modification, based on...
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5537601 |
Programmable digital signal processor for performing a plurality of signal processings
A digital signal processor for processing various types of signals, such as an image signal and an audio signal, a basic signal processing part, a programmable logic part, and a bus for connecting...
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5526407 |
Method and apparatus for managing information
A method and apparatus for recording, categorizing, organizing, managing and retrieving speech information obtains a speech stream; stores the speech stream in at least a temporary storage;...
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5517492 |
Increased speech interleave with reduced delay
In a TDM readiotelephone network, there is provided a mechanism for introducing link asymmetry between an uplink and a downlink, paired frame alternation on the uplink and downlink and bandwidth...
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5515395 |
Coding method, coder and decoder for digital signal, and recording medium for coded information information signal
In quantizing a digital signal in respective frequency bands by quantization units and transmitting (transmitting or recording) such quantized digital signal, second quantization accuracy...
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5508949 |
Fast subband filtering in digital signal coding
A coding system for data compression and decompression of a digitized source signal, for example in accordance with the MPEG audio standard, includes an analysis filter in which an inverse discrete...
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5488704 |
Speech codec
A speech codec includes a drive sound source generating circuit in which, in a case of a voiced sound speech, a pulse pattern signal corresponding to a pitch-scale, drive sound source signals...
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5487086 |
Transform vector quantization for adaptive predictive coding
Before transmitting signals to a receiver, the signals are subjected to adaptive prediction to generate a residual signal for transmission, and the residual signal is then transformed into...
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5481614 |
Method and apparatus for coding audio signals based on perceptual model
Coding of high quality stereophonic audio signals is accomplished in a perceptual filterbank coder which exploits the interchannel redundancies and psychoacoustic. Using perceptual principles,...
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5479562 |
Method and apparatus for encoding and decoding audio information
The invention relates to formatting encoded audio information in a form suitable for transmission or storage. Audio information is encoded into a binary form, using an invariant number of bits to...
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5475789 |
Method of compressing an audio signal using adaptive bit allocation taking account of temporal masking
An audio signal is coded by converting the audio signal into a signal in a frequency domain and effecting a big allocation on the converted audio signal. A masking threshold level for reducing...
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5473631 |
Simultaneous transmission of data and audio signals by means of perceptual coding
A communication system for simultaneously transmitting data and audio signals via a conventional audio communications channel using perceptual coding techniques Is disclosed. In a preferred...
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5471557 |
Speech recognition system utilizing a neural network
A speech recognition system for recognizing the remote-controlling vocal commands of TV sets and VCRs comprises a microphone for receiving the speech pronounced by a user; a speech analyzer for...
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5471558 |
Data compression method and apparatus in which quantizing bits are allocated to a block in a present frame in response to the block in a past frame
A digital input signal is compressed to provide a compressed output signal in a manner which prevents pre-echo, a common defect of data compressors. The digital input signal is divided in time into...
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5457782 |
Digital signal processing circuit board having use for voice processing system
A digital voice processing circuit board having use in a voice processing system wherein voice processing functions are run in software. This application of software allows a modular structure...
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5455889 |
Labelling speech using context-dependent acoustic prototypes
The present invention relates to labelling of speech in a context-dependent speech recognition system. When labelling speech using context-dependent prototypes the phone context of a frame of...
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5451951 |
Method of, and system for, coding analogue signals
In a code excited linear prediction (CELP) analog signal coding system sequences from a master codebook (40), which may be a one dimensional codebook, are filtered (42) and then stored in slave...
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5451954 |
Quantization noise suppression for encoder/decoder system
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to the suppression of quantizing noise...
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5450522 |
Auditory model for parametrization of speech
A method and system are provided for alleviating the harmful effects of convolutional distortions of speech, such as the effect of a telecommunication channel, on the performance of an automatic...
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