Start-up method for mobile transceivers, mobile transceivers and fixed transceivers thereof
First Claim
1. A control system for a mobile transceiver unit, said system comprising:
- pulse signal generation means for receiving a signal representative of a signal from an external source and for generating a pulse signal responsive to said received signal;
an integrator integrating said pulse signal generated by said pulse signal generation means; and
start-up discriminator means for comparing said integrated pulse signal with a first reference value and for activating a communication section of said mobile transceiver unit when a level of said integrated pulse signal reaches said first reference value.
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Accused Products
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.
29 Citations
17 Claims
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1. A control system for a mobile transceiver unit, said system comprising:
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pulse signal generation means for receiving a signal representative of a signal from an external source and for generating a pulse signal responsive to said received signal; an integrator integrating said pulse signal generated by said pulse signal generation means; and start-up discriminator means for comparing said integrated pulse signal with a first reference value and for activating a communication section of said mobile transceiver unit when a level of said integrated pulse signal reaches said first reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a mobile transceiver unit, said method comprising the steps of:
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sending periodic signals from an interrogator; receiving said periodic signals; generating pulse signals responsive to said periodic signals; integrating said pulse; comparing said integrated pulse signals to a first reference value; and actuating a communication section of said mobile transceiver unit when a level of said integrated pulse signals exceeds said first reference value. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification