H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/27
H04B 7/26 (2006.01) H04B 1/46 (2006.01)
Patent
CA 1238688
Abstract of the Disclosure: In a radio communication system, a mobile station (11) comprises a detecting circuit (16) for producing a detection signal during presence of an audio signal. A producing circuit (31) delivers a predetermined coded data signal to the audio signal circuit (14) and supplies a duration signal to a power unit (17) at the end of the detection signal. The power unit disables the trans- mitting circuit during absence of the detection signal and the duration signal. The transmitting circuit trans- mits a transmission radio signal modulated by the audio signal and the predetermined coded data signal. A fixed station comprises a separating circuit (44) for separating a reproduction of the predetermined coded data signal from a reproduction of the audio signal. A discriminating circuit (45) discriminates the reproduc- tion of the predetermined coded data signal. Consequently, the fixed station is able to discriminate between presence and absence of the audio signal. (Figs. 1 and 3)
468669
Corporation Nec
Smart & Biggar
LandOfFree
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