The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 23, 1989
Filed:
Aug. 04, 1988
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A word speech recognition apparatus recognizes a speech inputted to a microphone (11). A feature extracting portion (20) extracts a feature parameter based on a aural signal waveform outputted from the microphone. The feature extracting circuit comprises a pitch cycle extraction circuit (21) for extracting pitch frequency of the speech signal waveform, a digital filter (23) for extracting, as a feature parameter, spectrum data of the speech signal waveform, and a filter coefficient setting circuit (22) for setting a filter coefficient so that a resonance frequency of the digital filter is an integral multiple of the pitch frequency. The feature parameter extracted from the feature extracting circuit is stored in an input pattern memory (3). A recognition processing portion (50) evaluates similarity between the feature parameter stored in advance in a registration pattern memory (4) and the feature parameter stored in the input pattern memory, so that speech recognition processing is made. Improved signal in noise performance results from very narrow bandwidth filters.