JPH05333899

PURPOSE:To provide the speech input device which can be improved in recognition rate when used in noise environment, and the speech recognizing device and alarm generating device which use the speech input device as a preprocessor. CONSTITUTION:The output of a bone conduction type microphone 41 is l...

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Bibliographic Details
Main Authors FUJIMOTO SHOJI, SAKO KAZUYA
Format Patent
LanguageEnglish
Published 17.12.1993
Edition5
Subjects
ACOUSTICS
ALARM SYSTEMS
MUSICAL INSTRUMENTS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
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Summary:PURPOSE:To provide the speech input device which can be improved in recognition rate when used in noise environment, and the speech recognizing device and alarm generating device which use the speech input device as a preprocessor. CONSTITUTION:The output of a bone conduction type microphone 41 is led to a digital filter 43 and equalized by using the output of a contact type microphone 42 which is passed through a delay part 44 as a reference signal. The coefficient of the filter 43 is so adjusted by a coefficient adjustment part 46 so that the difference between the output of the filter 43 and the output of the delay part 44 becomes minimum. Namely, the speech signal gathered by the bone conduction type microphone which has superior noise removing performance, but inferior high-frequency-range characteristics is equalized according to the speech signal gathered by the contact type microphone which has superior characteristics even in a high frequency range, so the speech input device outputs a noise-removed speech signal which has flat characteristics up to high frequencies.
Bibliography:Application Number: JP19920138947