RECEIVED SIGNAL DETECTOR

PURPOSE:To secure a communication enable area matching the ability of reception by detecting the arrival of radio waves from a communicating party station on reception standby with a direct current voltage V2 lower than a direct current voltage V1 corresponding to a legal reception level as a thresh...

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Bibliographic Details
Main Author MATSUSHITA HISAHIRO
Format Patent
LanguageEnglish
Published 06.08.1992
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
WIRELESS COMMUNICATIONS NETWORKS
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Summary:PURPOSE:To secure a communication enable area matching the ability of reception by detecting the arrival of radio waves from a communicating party station on reception standby with a direct current voltage V2 lower than a direct current voltage V1 corresponding to a legal reception level as a threshold value. CONSTITUTION:A received intermediate frequency signal is converted to a direct current voltage by a rectifier integration circuit 11 and inputted to first and second voltage comparators 12 and 13 later. The direct current voltage V1 corresponding to the legislated reception level is inputted to the first voltage comparator 12 as the threshold value and therefore, a carrier sense function is presented. The direct current voltage V2 (V2<V1) corresponding to the reception level when a demodulation S/N is a reference value is inputted to the second voltage comparator 13 as the threshold value and therefore, the arrival of radio waves from the communicating party station on reception standby is judged.
Bibliography:Application Number: JP19900402875