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7630889 |
Code conversion method and device
A code conversion method for converting first code string data conforming to a first speech coding scheme into second code string data conforming to a second speech coding scheme has the steps of...
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7630891 |
Voice region detection apparatus and method with color noise removal using run statistics
The present invention relates to a voice region detection apparatus and method capable of accurately detecting a voice region even in a voice signal with color noise. The voice region detection...
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7624009 |
Method and system for producing variable length context models
Various embodiments of the present invention provide methods and systems for determining, representing, and using variable-length contexts in a variety of different computational applications. In...
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7620544 |
Method and apparatus for detecting speech segments in speech signal processing
A method and apparatus for detecting speech segments of a speech signal processing device is provided. A critical band is divided into a certain number of regions according to noise frequency...
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7617099 |
Noise suppression by two-channel tandem spectrum modification for speech signal in an automobile
Techniques for suppressing noise from a signal comprised of speech plus noise. A first signal detector (e.g., a microphone) provides a first signal comprised of a desired component plus an...
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7617098 |
Method of noise reduction based on dynamic aspects of speech
A system and method are provided that reduce noise in pattern recognition signals. To do this, embodiments of the present invention utilize a prior model of dynamic aspects of clean speech together...
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7613611 |
Method and apparatus for vocal-cord signal recognition
Provided is a method and an apparatus for vocal-cord signal recognition. A signal processing unit receives and digitalizes a vocal cord signal, and a noise removing unit which channel noise...
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7606705 |
Speech data receiver with detection of channel-coding rate
Disclosed is a system and method for channel decoding speech frames in a receiver capable of multiple (M) codec modes, wherein channel encoded speech frames include an inband bit portion and a...
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7606704 |
Quality assessment tool
A non-intrusive speech quality assessment system. A method and apparatus for training a quality assessment tool in which a database comprising a plurality of samples, each with an associated mean...
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7596494 |
Method and apparatus for high resolution speech reconstruction
A method and apparatus identify a clean speech signal from a noisy speech signal. The noisy speech signal is converted into frequency values in the frequency domain. The parameters of at least one...
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7593851 |
Precision piecewise polynomial approximation for Ephraim-Malah filter
Precision piecewise polynomial approximation for Ephraim-Malah filter is described herein. In one embodiment, an exemplary process includes computing a first parameter based on Wiener filter...
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7593850 |
Methods for collecting media segments in a media signal via comparing segments of the signal to later segments
A method to achieve signals which are essentially devoid of unwanted signal components uses a search and comparison process. Media signals are received through receiving means, the media signals...
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7590523 |
Speech post-processing using MDCT coefficients
There is provided a speech post-processor for enhancing a speech signal divided into a plurality of sub-bands in frequency domain. The speech post-processor comprises an envelope modification...
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7590531 |
Robust decoder
Techniques and tools related to delayed or lost coded audio information are described. For example, a concealment technique for one or more missing frames is selected based on one or more factors...
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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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7562013 |
Method for recovering target speech based on amplitude distributions of separated signals
The present invention provides a method for recovering target speech based on shapes of amplitude distributions of split spectra obtained by use of blind signal separation. This method includes: a...
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7542900 |
Noise reduction using correction vectors based on dynamic aspects of speech and noise normalization
A method and apparatus are provided for reducing noise in a signal. Under one aspect of the invention, a correction vector is selected based on a noisy feature vector that represents a noisy...
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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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7536301 |
System and method for implementing real-time adaptive threshold triggering in acoustic detection systems
A system and method to generate a trigger signal based on a real-time adaptive threshold. The system may include a microphone to receive an audio signal, a device to generate a trigger signal based...
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7526432 |
Apparatus and method for producing a data stream and apparatus and method for reading a data stream
An entropy encoder includes an apparatus for producing a data stream which comprises two reference points, of code words of variable lengths, the apparatus comprising a first device for writing at...
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7516067 |
Method and apparatus using harmonic-model-based front end for robust speech recognition
A system and method are provided that reduce noise in speech signals. The system and method decompose a noisy speech signal into a harmonic component and a residual component. The harmonic...
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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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7509255 |
Apparatuses for adaptively controlling processing of speech signal and adaptively communicating speech in accordance with conditions of transmitting apparatus side and radio wave and methods thereof
An apparatus for processing a speech signal includes a receiver, a speech signal decoder, a speech rate conversion information detector, and a speech rate converting processor. The receiver...
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7502735 |
Speech signal transmission apparatus and method that multiplex and packetize coded information
A speech signal transmission apparatus multiplexes, packetizes, and sends first coded information coded in a normal state and second coded information used for improving the quality of decoded...
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7499856 |
Estimation method and apparatus of overall conversational quality taking into account the interaction between quality factors
The delay time and listening quality of a system under test are measured from a signal received therefrom, then the measured delay time and listening quality are transformed to a delay-related...
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7496507 |
Digitized audio data reproduction apparatus, and integrated circuit device to output audio signals
An audio data reproduction apparatus, integrated circuit device, and computer program product configured to implement a method for reproducing audio data that includes receiving an audio stream,...
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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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7490044 |
Audio signal processing
An audio system for processing two channels of audio input to provide more than two output channels. The input may be conventional stereo material or compressed audio signal data. The audio...
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7487084 |
Apparatus, program storage device and method for testing speech recognition in the mobile environment of a vehicle
A testing arrangement provided for speech recognition systems in vehicles. Preferably included are a “mobile client” secured in the vehicle and driven around at a desired speed, an audio system...
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7478040 |
Method for adaptive filtering
A method for adaptive long-term filtering of an audio signal, such as a decoded speech signal. The method includes measuring a smoothed periodicity of an audio signal segment, such as an audio...
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7464029 |
Robust separation of speech signals in a noisy environment
A method for improving the quality of a speech signal extracted from a noisy acoustic environment is provided. In one approach, a signal separation process is associated with a voice activity...
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7457749 |
Noise-robust feature extraction using multi-layer principal component analysis
Extracting features from signals for use in classification, retrieval, or identification of data represented by those signals uses a “Distortion Discriminant Analysis” (DDA) of a set of...
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7454333 |
Separating multiple audio signals recorded as a single mixed signal
A method according to the invention separates multiple audio signals recorded as a mixed signal via a single channel. The mixed signal is A/D converted and sampled. A sliding window is applied to...
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7453963 |
Subtractive cancellation of harmonic noise
A common problem in audio processing is that a useful signal is disturbed by one or more sinusoidal noises that should be suppressed. One embodiment of the invention provides a method of canceling...
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7451092 |
Detection of signal modifications in audio streams with embedded code
An encoder transforms at least a portion of a signal, counts the resulting transform coefficients having a zero value, and encodes the signal with the zero count. A decoder decodes the signal in...
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7447630 |
Method and apparatus for multi-sensory speech enhancement
A method and system use an alternative sensor signal received from a sensor other than an air conduction microphone to estimate a clean speech value. The estimation uses either the alternative...
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7440892 |
Method, device and program for extracting and recognizing voice
In a method of extracting voice components free of noise components from voice signals input through a single microphone, a signal-decomposing unit extracts independent signal components from the...
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7436969 |
Method and system for optimizing denoising parameters using compressibility
In various embodiments of the present invention, a noisy signal denoiser is tuned and optimized by selecting denoiser parameters that provide relatively highly compressible denoiser output. When...
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7436786 |
Telecommunications system for minimizing the effect of white noise data packets for the generation of required white noise on transmission channel utilization
Minimizing the effects of the requisite AGWN packets on transmission channel utilization without diminishing any of the aesthetic quality of the AGWN white noise on the voice or audio...
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7433822 |
Method and apparatus for encoding and decoding pause information
At an audio source, pause information is added to audio data, the combination of which is subsequently packetized. The resulting packets are transmitted to an audio destination via a network in...
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7430255 |
Impulse noise suppression device
Digital audio data with error detection bits added thereto is inputted to an error detecting and correcting device ( 4 ). The correcting device ( 4 ) corrects an error when the error is detected in...
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7426465 |
Speech signal decoding method and apparatus using decoded information smoothed to produce reconstructed speech signal to enhanced quality
In a speech signal decoding method, information containing at least a sound source signal, gain, and filter coefficients is decoded from a received bit stream. Voiced speech and unvoiced speech of...
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7412375 |
Speech quality assessment with noise masking
A method and apparatus for assessing the perceptual quality of stereo speech signals transmitted via a telecommunications network and recorded acoustically from an acoustic terminal device in which...
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7406411 |
Bit error concealment methods for speech coding
A system and method of concealing bit errors in a signal are provided. An exemplary method detects bit errors in an input signal having at least a current signal segment and a previous signal...
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7403895 |
Control system outputting received speech with display of a predetermined effect or image corresponding to its ambient noise power spectrum
A control system receiving an input signal, comprising speech with ambient noise, determines the ambient noise power spectrum, retrieves control information corresponding to the closest-matching...
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7401022 |
Processing a speech frame in a radio system
The invention relates to method of processing a speech frame in radio system, a radio system, a mobile station in radio system, and a network of radio system. In the method a speech frame having...
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7383179 |
Method of cascading noise reduction algorithms to avoid speech distortion
A method of reducing noise by cascading a plurality of noise reduction algorithms is provided. A sequence of noise reduction algorithms are applied to the noisy signal. The noise reduction...
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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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7383175 |
Pitch adaptive equalization for improved audio
A pitch adaptive circuit ( 200 ) includes an equalizer control circuit ( 206 ) that evaluates the pitch of the speech signals that are being processed and depending on the pitch information, the...
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