Transmission-reception time correction system

Details Transmission-reception time correction system Transmission-reception time correction system

1996-11-21

1998-11-17

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

3408252, H04Q 100

Patent

active

058382542

ABSTRACT:
The invention relates to a transmission-reception system. A transponder receiver unit contained in the key bow of an ignition key has a power circuit that receivers, rectifies and smoothes the carrier wave signal transmitted together with a time reference signal and an enquiry signal from the transmission-reception ECU of a motor vehicle. A microcomputer in the transponder becomes active when the output voltage of the power circuit reaches a predetermined level or higher. When activated, the microcomputer measures the time length of the received reference time signal using the clock signal generated by an oscillation circuit, and calculates a ratio, as a correction coefficient, between the measured time length and a stored reference time value. The microcomputer decodes the enquiry signal while correcting the time information included in the time series pulse signal forming the enquiry signal, using the correction coefficient.

REFERENCES:
patent: 4803703 (1989-02-01), DeLuca
patent: 4852090 (1989-07-01), Borth
patent: 5276706 (1994-01-01), Critchlow
patent: 5376932 (1994-12-01), Samokin

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