Receiver circuit and method for tire pressure monitoring system

Details Receiver circuit and method for tire pressure monitoring system Receiver circuit and method for tire pressure monitoring system

2006-02-21

2006-02-21

Nguyen, Phung T. (Department: 2632)

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

C340S442000, C455S130000

Reexamination Certificate

active

07002456

ABSTRACT:
Circuit system and method for receiving and demodulating signals to a tire pressure monitoring system. The circuit comprises a demodulator for receiving an input signal modulated at a first frequency and demodulating the input signal so that information can be extracted from the input signal at a second frequency lower than the first frequency. The circuit further comprises a microprocessor, operating at a clock rate selected to extract information from the demodulated signal at the second frequency, for receiving and decoding a demodulated signal from the demodulator. In another aspect, the demodulator comprises a switching circuit having a time constant longer than the period of the first frequency. The switching circuit provides a low signal when the demodulator receives an input signal in a first state, remains low after the amplified signal changes to a second state for a time constant period, and provides a high signal when the amplified signal is in the second state after the time constant period has elapsed.

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RIN 2127-A133F Federal Motor Vehicle Safety Standards: Tire Pressure Monitoring Systems; Controls and Displays; Department of Transportation, National Highway Traffic Safety Administration, 49 CFR Part 571, (www.nhtsa.dot.gov/cars/rules/rulings/TirePressure/fedreg.htm), 45 pages.

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