Noise cancellation system, speech recognition system, and car navigation system

A noise cancellation system with improved performance for canceling from an input signal of a microphone a noise component relating to reproduced sound of an audio system reproducing multiple channels of sound, provided with an audio canceller for acquiring audio signals of two channels and processi...

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Bibliographische Detailangaben
Hauptverfasser:	AKAHORI ICHIRO, OTSUKA MANABU
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR BANDAGES, DRESSINGS OR ABSORBENT PADS DEAF-AID SETS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION GYROSCOPIC INSTRUMENTS HUMAN NECESSITIES HYGIENE LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MEASURING MEASURING DISTANCES, LEVELS OR BEARINGS MEDICAL OR VETERINARY SCIENCE METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS NAVIGATION ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PHOTOGRAMMETRY OR VIDEOGRAMMETRY PHYSICS PROSTHESES PUBLIC ADDRESS SYSTEMS SIGNALLING SOUND-PRODUCING DEVICES SPEECH ANALYSIS OR SYNTHESIS SPEECH OR AUDIO CODING OR DECODING SPEECH OR VOICE PROCESSING SPEECH RECOGNITION SURVEYING TESTING TRAFFIC CONTROL SYSTEMS TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	A noise cancellation system with improved performance for canceling from an input signal of a microphone a noise component relating to reproduced sound of an audio system reproducing multiple channels of sound, provided with an audio canceller for acquiring audio signals of two channels and processing them by filter coefficients by convolutional processing so as to produce noise cancellation signals at adaptive filters, an adder for adding the input signal of the microphone and the noise cancellation signals, canceling the noise component from the input signal, and outputting the signal after noise cancellation, nonlinear converters for nonlinear conversion of the signal after noise cancellation, and filter learning units for calculating the filter coefficients to be set next based on the nonlinear converted signal.