HAND-FREE MOBILE TELEPHONE SYSTEM

PURPOSE:To realize clear talking by automatically adjusting at least one of a voice signal inputted from a microphone and a conversion voice signal outputted from a speaker based on a noise data detected by a voice recognition device at hand-free talking. CONSTITUTION:A voice recognition device 8 us...

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Bibliographic Details
Main Authors SHITAYA MITSUO, KANEKO KAZUMA, MORIHIRO YOSHIHARU
Format Patent
LanguageEnglish
Published 17.09.1992
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Summary:PURPOSE:To realize clear talking by automatically adjusting at least one of a voice signal inputted from a microphone and a conversion voice signal outputted from a speaker based on a noise data detected by a voice recognition device at hand-free talking. CONSTITUTION:A voice recognition device 8 uses a voice characteristic extraction circuit to extract a noise data for a prescribed period at hand-free talking and sends the result to a noise discrimination circuit 11. The circuit 11 implements time average processing and change extraction processing of a spectrum characteristic of noise and discriminates the noise data from the signal obtained through the processing. Then the circuit 11 discriminates it that a change in the characteristic is steady in the noise spectrum and the quantity of the noise level to adjust the gain of a gain variable amplifier 13. On the other hand, the gain of the gain variable amplifier 12 is adjusted even to the microphone 4 to allow the voice signal to be easily heard by an opposite party.
Bibliography:Application Number: JP19910022132