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US20090226005 |
SPATIAL NOISE SUPPRESSION FOR A MICROPHONE ARRAY
A noise reduction system and a method of noise reduction includes a microphone array comprising a first microphone, a second microphone, and a third microphone. Each microphone has a known position...
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US20090177468 |
SPEECH RECOGNITION WITH NON-LINEAR NOISE REDUCTION ON MEL-FREQUENCY CEPTRA
In an automatic speech recognition system, a feature extractor extracts features from a speech signal, and speech is recognized by the automatic speech recognition system based on the extracted...
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US20090150143 |
MDCT domain post-filtering apparatus and method for quality enhancement of speech
A post-filtering apparatus and method for speech enhancement in a modified discrete cosine transform (MDCT) domain are disclosed. In the apparatus and method, previous and current MDCT coefficients...
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US20090132245 |
Denoising Acoustic Signals using Constrained Non-Negative Matrix Factorization
A method and system denoises a mixed signal. A constrained non-negative matrix factorization (NMF) is applied to the mixed signal. The NMF is constrained by a denoising model, in which the...
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US20090076810 |
Sound processing apparatus, apparatus and method for cotrolling gain, and computer program
A sound processing apparatus is provided for estimating the power of background noise using a directional sound receiving technology using a plurality of sound receiving units, computing a gain...
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US20090055170 |
Sound Source Separation Device, Speech Recognition Device, Mobile Telephone, Sound Source Separation Method, and Program
A sound source signal from a target sound source is allowed to be separated from a mixed sound which consists of sound source signals emitted from a plurality of sound sources without being...
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US20080306734 |
Signal Noise Reduction
Provision to reduce production of musical noise. A noise reduction device includes: means for calculating a rank for each element included in a first region having predetermined sizes in the time...
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US20080300869 |
Audio Signal Dereverberation
A method of estimating the reverberations in an acoustic signal (y) comprises the steps of determining the frequency spectrum (Y) of the signal (y), providing a first parameter (α) indicative of...
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US20080243496 |
Band Division Noise Suppressor and Band Division Noise Suppressing Method
A band division noise suppressor suppressing noise sufficiently with a small amount of processing and a little voice distortion. In the band division noise suppressor, a band dividing section ( 101...
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US20080189104 |
Adaptive noise suppression for digital speech signals
An apparatus for adaptively suppressing noise in an input signal frequency spectrum derived from overlapping input frames is provided. The system includes a psychoacoustic power computation module...
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US20080177532 |
Apparatus and methods for enhancement of speech
A method for improving the intelligibility of an incoming telephone signal, including boosting loudness of at least one band of poorly heard frequencies of the signal within at least one band of...
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US20080167869 |
Speech Recognition Apparatus
A voice recognition system ( 10 ) for improving the toughness of voice recognition for a voice input for which a deteriorated feature amount cannot be completely identified. The system comprises at...
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US20080167863 |
Apparatus and method of improving intelligibility of voice signal
The present invention relates to an apparatus and method of improving intelligibility of a voice signal. A method of improving intelligibility of a voice signal according to an embodiment of the...
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US20080162123 |
Two stage frequency subband decomposition
A method for multifunctional processing of signals in frequency subbands performs subband decomposition and signal processing in two stages. A fullband signal is first splitted, with downsampling,...
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US20080147392 |
PUSH-TO-TALK SYSTEM WITH ENHANCED NOISE REDUCTION
Methods and apparatus for reducing the effect of surrounding noise in a push-to-talk (PTT) system are disclosed. In one embodiment, a method includes obtaining a first media stream using a...
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US20080147394 |
SYSTEM AND METHOD FOR IMPROVING AN INTERACTIVE EXPERIENCE WITH A SPEECH-ENABLED SYSTEM THROUGH THE USE OF ARTIFICIALLY GENERATED WHITE NOISE
A speech processing system for improving a user's experience with a speech-enabled system using artificially generated white noise. The system can include an audible environment that includes at...
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US20080120100 |
Method For Detecting Target Sound, Method For Detecting Delay Time In Signal Input, And Sound Signal Processor
A sound signal processor includes first and second framing sections, first and second frequency analyzing sections, and a cross-spectrum calculating sections, for detecting the phase of a...
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