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7624079 |
Method and apparatus for training a system model with gain constraints using a non-linear programming optimizer
Method and apparatus for training a system model with gain constraints. A method is disclosed for training a steady-state model, the model having an input and an output and a mapping layer for...
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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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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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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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7613608 |
Method and circuit for noise estimation, related filter, terminal and communication network using same, and computer program product therefor
A filter such as a Wiener filter for noise reduction in a signal, such as a speech signal, affected by background noise includes a circuit for determining values of an update function relating new...
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7613607 |
Audio enhancement in coded domain
Method and apparatus for enhancing a coded audio signal comprising indices which represent audio signal parameters which comprise at least a first parameter representing a first characteristic of...
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7610197 |
Method and apparatus for comfort noise generation in speech communication systems
A method that may be used in variety of electronic devices for generating comfort noise includes receiving a plurality of information frames indicative of speech plus background noise, estimating...
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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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7602926 |
Stationary spectral power dependent audio enhancement system
An audio enhancement system ( 1 ) for speech recognition or voice control is described, comprising a signal input for carrying a distorted desired signal (z), a reference signal input, and a...
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7599835 |
Digital signal encoding method, decoding method, encoding device, decoding device, digital signal encoding program, and decoding program
A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main...
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7596496 |
Voice activity detection apparatus and method
A voice activity detection method comprising the steps of (a) Estimating in a noise power estimator the noise power within a signal having a speech component and a noise component, and (b)...
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7596495 |
Current noise spectrum estimation method and apparatus with correlation between previous noise and current noise signal
A method is provided for recurrently estimating a spectrum of noise at each signal observation interval from a sound signal which contains the noise and which is observed at each signal observation...
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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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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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7593848 |
Auto-correlators with DC and CW cancellation
Embodiments of methods and means for correcting auto-correlated wireless signal samples are provided. Such embodiments include isolating and subtracting an interference vector from auto-correlated...
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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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7590530 |
Method and apparatus for improved estimation of non-stationary noise for speech enhancement
A central aspect of the invention relates to a method of enhancing speech, the method comprising the steps of, receiving noisy speech comprising a clean speech component and a non-stationary noise...
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7590529 |
Method and apparatus for reducing noise corruption from an alternative sensor signal during multi-sensory speech enhancement
A method and apparatus classify a portion of an alternative sensor signal as either containing noise or not containing noise. The portions of the alternative sensor signal that are classified as...
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7590528 |
Method and apparatus for noise suppression
An apparatus for noise suppression has a converter for converting an input signal into a frequency-domain, an SNR calculator for determining a signal-to-noise ratio (SNR) using the frequency-domain...
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7587316 |
Noise canceller
A noise canceller removes a noise component from an input speech signal. The noise canceller includes a noise cancellation coefficient adjuster that adjusts a noise cancellation coefficient to...
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7584097 |
System and method for noisy automatic speech recognition employing joint compensation of additive and convolutive distortions
A system for, and method of, noisy automatic speech recognition employing joint compensation of additive and convolutive distortions and a digital signal processor incorporating the system or the...
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7574355 |
Apparatus and method for determining a quantizer step size
For determining a quantizer step size for quantizing a signal including audio or video information, a first quantizer step size as well as an interference threshold are provided. Then, the actual...
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7574008 |
Method and apparatus for multi-sensory speech enhancement
A method and apparatus determine a channel response for an alternative sensor using an alternative sensor signal and an air conduction microphone signal. The channel response is then used to...
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7574006 |
Active noise controller
An active noise controller can determine the signal transmission characteristics from the power amplifier and the speaker to the microphone without using any special external measuring instrument...
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7567548 |
Method to reduce the distortion in a voice transmission over data networks
The perceptual quality of voice signals used for Voice over IP (VoIP) systems is assessed. The content of the voice data packets may be altered in order to increase the perceived quality of the...
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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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7565288 |
Spatial noise suppression for a microphone array
A microphone array having at least three microphones provides a captured signal. Spatial noise suppression estimates a desired signal from a captured signal using spatio-temporal distribution of...
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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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7558729 |
Music detection for enhancing echo cancellation and speech coding
A method of using music detection to enhance an operation of an echo canceller is provided, wherein the echo canceller includes an adaptive filter and a nonlinear processor. The method comprises...
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7548854 |
Architectural sound enhancement with pre-filtered masking sound
A unique, fully integrated, fully programmable, and highly flexible sound distribution system and methodology for providing masking sound, background music, and paging capabilities in up to eight...
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7548852 |
Quality of decoded audio by adding noise
The present invention relates to a method of encoding and decoding an audio signal. The invention further relates to an arrangement for encoding and decoding an audio signal. The invention further...
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7546240 |
Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition
A transform coder is described that performs a time-split transform in addition to a discrete cosine type transform. A time-split transform is selectively performed based on characteristics of...
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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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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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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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7526428 |
System and method for noise cancellation with noise ramp tracking
A system and method for noise cancellation with noise ramp tracking in the presence of severe or ramping acoustic noise. The system conducts an estimation of the noise level in the input signal and...
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7519347 |
Method and device for noise detection
A system and method for detecting cell phone noise induced in telecommunication equipment, especially in microphones and other unshielded electronic units connected to a communication terminal. A...
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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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7516065 |
Apparatus and method for correcting a speech signal for ambient noise in a vehicle
A speech correction apparatus includes a speaker for generating guidance speech; a microphone set at a hearing position; an acoustic-characteristic setting unit for separating ambient noise from...
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7499855 |
Delay free noise suppression
An apparatus, a circuit and a method are given, to realize very effective noise suppression for speech signals. Using thereby novel calculation methods allow for a real-time operation without any...
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7496506 |
Method and apparatus for one-stage and two-stage noise feedback coding of speech and audio signals
Codec structures for achieving two-stage prediction and two-stage noise spectral shaping at the same time, resulting in a Two-Stage Noise Feedback Coding (TSNFC) method. One approach combines two...
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7493256 |
Method and apparatus for high performance low bit-rate coding of unvoiced speech
A low-bit-rate coding technique for unvoiced segments of speech, without loss of quality compared to the conventional Code Excited Linear Prediction (CELP) method operating at a much higher bit...
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7489789 |
Method for noise reduction in an audio device and hearing aid with means for reducing noise
The invention regards a method for noise reduction in an audio device whereby an electrical and/or digital signal which represents sound is routed simultaneously through:—a signal analysis path,...
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7483831 |
Methods and apparatus for maximizing speech intelligibility in quiet or noisy backgrounds
Methods and apparatus for maximizing speech intelligibility use psycho-acoustic variables of a model of speech perception to control the determination of optimal frequency-band specific gain...
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7480614 |
Energy feature extraction method for noisy speech recognition
The present invention provides an energy feature extraction method for noisy speech recognition. At first, noisy speech energy of an input noisy speech is computed. Next, the noise energy in the...
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7478042 |
Speech decoder that detects stationary noise signal regions
A first determiner 121 tentatively determines whether the current processing unit represents a stationary noise period, based on stationary properties of a decoded signal. Based on the tentative...
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7478041 |
Speech recognition apparatus, speech recognition apparatus and program thereof
Provided is a method for canceling background noise of a sound source other than a target direction sound source in order to realize highly accurate speech recognition, and a system using the same....
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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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