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7624008 |
Method and device for determining the quality of a speech signal
Methods and devices for objectively predicting perceptual quality of speech signals degraded in a speech processing/transporting system which may have poor prediction results for degraded signals...
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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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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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7593849 |
Normalization of speech accent
A normalizer ( 100, 300 ) of the accent of accented speech modifies ( 210, 410 ) the characteristics of input signals that represent the speech spoken in an individual voice with an accent to form...
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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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7565289 |
Echo avoidance in audio time stretching
A transient echo can be avoided during time stretching of a digital audio signal by detecting a transient in a frame of a digital audio signal, identifying another occurrence of the transient in a...
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7539614 |
System and method for audio signal processing using different gain factors for voiced and unvoiced phonemes
In a sound reproduction or recording system an audio signal is multiplied by a gain factor (z) which is dependent on the input level (y). The dependence of the gain factor on input level is chosen...
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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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RE40691 |
Encoding decoding and compression of audio-type data using reference coefficients located within a band of coefficients
An audio type signal is encoded. The signal is first divided into bands. For each band, a yardstick signal element is selected. The yardstick may be the signal element having the largest magnitude...
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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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7469208 |
Method and apparatus for automatically normalizing a perceived volume level in a digitally encoded file
Automatically normalizing a perceived loudness for a digitally encoded audio track formed of a number of channels during playback on a multimedia asset player is described. A number of auditory...
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7467084 |
Device and method for operating a voice-enhancement system
A method and a device are for operating a voice-enhancement system, such as a communication and/or intercom/two-way intercom or duplex telephony device in a motor vehicle. The device includes at...
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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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7454330 |
Method and apparatus for speech encoding and decoding by sinusoidal analysis and waveform encoding with phase reproducibility
A speech encoding method and apparatus in which an input speech signal is divided in terms of blocks or frames as encoding units and encoded in terms of the encoding units, whereby explosive and...
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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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7428489 |
Encoding method and apparatus, and decoding method and apparatus
In a decoding apparatus ( 30 ), power compensation spectrum generation/composition units ( 37 1 to 37 4 ) adjust power of power compensation spectrums PCSP based on quantization accuracy...
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7428488 |
Received voice processing apparatus
A received voice processing apparatus is provided, in which the received voice processing apparatus includes: a target spectrum calculation part for calculating, for each frequency band, a target...
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7426557 |
System, method, and service for inducing a pattern of communication among various parties
A communication pattern inducing system focuses on the propagation of topics amongst a plurality of nodes based on the text of the node rather than hyperlinks of the node. A node could represent a...
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7412380 |
Ambience extraction and modification for enhancement and upmix of audio signals
Modifying an audio signal comprising a plurality of channel signals is disclosed. At least selected ones of the channel signals are transformed into a time-frequency domain. The at least selected...
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7395078 |
Voice over short message service
A method of sending a voice message via a mobile communication device, said method involving: receiving an utterance from a user of the mobile communication device; generating a non-text...
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7391875 |
Peak-limiting mixer for multiple audio tracks
A method for processing audio signal that includes receiving a plurality of digital audio signals and calculating signal levels of them. The next step is calculating smooth attenuation signal for...
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7373282 |
Fault severity check and source identification
A fault severity check and source identification method for a frequency domain instrument accesses acquired reflection data for a transmission line under test. From the acquired data reflection...
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7353169 |
Transient detection and modification in audio signals
A system and method are disclosed for transient detection and modification in audio signals. Digital signal processing techniques are used to detect transients and modify an audio signal to enhance...
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7324927 |
Fast feature selection method and system for maximum entropy modeling
A method to select features for maximum entropy modeling in which the gains for all candidate features are determined during an initialization stage and gains for only top-ranked features are...
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7319954 |
Multi-channel codebook dependent compensation
Methods and apparatus, in the context of speech recognition, for compensating in the cepstral domain for the effect of an interfering signal by using a reference signal.
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7299175 |
Normalizing to compensate for block size variation when computing control parameter values for quality and rate control for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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7283956 |
Noise suppression
A method and apparatus for noise suppression is described herein. The channel gain is controlled based on a degree of variability of the background noise. The noise variability estimate is used in...
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7277550 |
Enhancing audio signals by nonlinear spectral operations
A system and method are disclosed for enhancing audio signals by nonlinear spectral operations. Successive portions of the audio signal are processed using a subband filter bank. A nonlinear...
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7272557 |
Method and apparatus for quantizing model parameters
A method of quantizing a model parameter includes applying the model parameter to a non-linear scaling function to produce a scaled model parameter and quantizing the scaled model parameter to form...
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7269553 |
Pseudo-cepstral adaptive short-term post-filters for speech coders
Methods and systems for filtering synthesized or reconstructed speech are implemented. A filter based on a set of linear predictive coding (LPC) coefficients is constructed by transforming the LPC...
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7269552 |
Quantizing speech signal codewords to reduce memory requirements
For the coding or decoding of speech signal sampled values, the values contained in the code books/code tables for the generation of the speech signal parameters are stored in quantized form. The...
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7242783 |
Audio limiting circuit
An audio limiting circuit capable of satisfying frequency dependent limits and time domain constraints, is disclosed. In one illustrative embodiment, an input node receives an unattenuated input...
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7228273 |
Voice control method
A voice control method that allows vocal characteristics of a character to diversely be set in a computer game where characters are capable of voice output is provided. The voice control method...
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7191123 |
Gain-smoothing in wideband speech and audio signal decoder
The gain smoothing method and device modify the amplitude of an innovative codevector in relation to background noise present in a previously sampled wideband signal. The gain smoothing device...
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7174291 |
Noise suppression circuit for a wireless device
An adaptive noise suppression system includes an input A/D converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow...
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7149684 |
Determining speech reception threshold
An improved method and system for performing speech reception threshold testing includes calibrating one or more recorded spoken words to have substantially the same sound energy and presenting the...
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7143031 |
Determining speech intelligibility
An improved method and system for performing speech intelligibility testing includes calibrating one or more recorded spoken words to have substantially the same sound energy and presenting the one...
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7133823 |
System for an adaptive excitation pattern for speech coding
There are provided short term enhancement methods and systems to improve perceptual quality in reproduced speech. According to one aspect, a method of enhancing a speech signal includes processing...
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7072829 |
Speech recognition from concurrent visual and audible inputs
With respect to each of codes corresponding to code vectors in a code book stored in a code book storage section, an expectation degree storage section stores an expectation degree at which...
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7062429 |
Distortion-based method and apparatus for buffer control in a communication system
A method and apparatus are disclosed for controlling a buffer in a communication system, such as a digital audio broadcasting (DAB) communication system. A more consistent perceptual quality over...
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7035418 |
Method and apparatus for determining sound source
Provided in accordance with the invention are a sound source identifying apparatus and method whereby objects as sound sources can be determined as to their locations with higher accuracy by using...
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7031913 |
Method and apparatus for decoding speech signal
A method of decoding a speech signal based on a CELP (Code Excited Linear Prediction) with improvement in degradation of decoded sound quality in a noise period. The method includes the steps of:...
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6993478 |
Vector estimation system, method and associated encoder
An encoder ( 60 ) and system ( 1 ) for processing a sequence of input vectors (y 0 to y T ) obtained from a speech signal. A filter ( 2 ) has both a current slowly evolving filter estimate output...
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6920188 |
Method and apparatus for processing a multiple-component wide dynamic range signal
An apparatus is provided for processing a wide dynamic range analog signal which comprises multiple components such as a signal with an in-phase component and a quadrature-phase component in for...
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6883015 |
Apparatus and method for providing server state and attribute management for multiple-threaded voice enabled web applications
An application server generates and maintains a server-side data record, also referred to as a “brownie”, that includes application state information and user attribute information for multiple...
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6850884 |
Selection of coding parameters based on spectral content of a speech signal
In a coding procedure, coding parameters are selected for coding the speech signal to achieve enhanced perceptual quality of reproduced speech. At least one coding parameter value or preferential...
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6847928 |
Speech decoder and speech decoding method
A decoding processing portion 11 of a speech decoder 10 is provided with an emphasis processing portion 15 for performing an emphasis process on signals to be processed (excited signals) SPC...
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6842733 |
Signal processing system for filtering spectral content of a signal for speech coding
A signal processing system is well suited for conditioning a speech signal prior to coding the speech signal to achieve enhanced perceptual quality of reproduced speech. The signal processing...
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6807524 |
Perceptual weighting device and method for efficient coding of wideband signals
A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal comprises a signal pre-emphasis filter, a synthesis filter calculator, and a perceptual...
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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...
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