Start-up method for mobile transceivers, mobile transceivers and

Details Start-up method for mobile transceivers, mobile transceivers and Start-up method for mobile transceivers, mobile transceivers and

1995-07-19

1997-10-28

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455343, 34082554, 342 50, 342 51, H04Q 718

Patent

active

056826036

ABSTRACT:
To provide a communications system to accurately detect when a mobile transceiver has entered an area where communication with a fixed transceiver is possible, and to start-up the internal circuitry of the mobile transceiver, a communications system transmits a start-up pilot signal of a prescribed period from a transponder mounted in a fixed station to a transponder mounted in a vehicle. In the transponder, the received signal upon being received by an antenna is detected in a detector and amplified in an amplifier. When this signal is greater than a reference voltage, a pulse is output from a level discriminator. This pulse signal is converted into a pulse of constant pulse width in a discriminator pulse generator and integrated in an integrator. When the integrated value exceeds a reference voltage, a start-up discriminator sends a drive signal to actuate the internal circuitry of the mobile transceiver. As a consequence, mistaken start-up of the internal circuitry due to noise input is prevented and the internal circuitry is started only when necessary.

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