Patent ID: 7002456
Filing Date: 2006-02-21
Classification: B60C

Abstract:
1. A tire pressure monitoring system including a receiver disposed on a tire on a vehicle and powered by a stand alone power source not capable of being recharged during operation of the vehicle, the receiver using a frequency domain process for reducing power consumption while operating, the system comprising: an input stage for receiving an externally derived signal modulated at a first frequency and providing an amplified signal having a first state and a second state; a demodulator for receiving the amplified signal from the input stage and demodulating the amplified signal so that information can be extracted from the amplified signal at a second frequency lower than the first frequency; and a microprocessor for receiving and decoding a demodulated signal from the demodulator, wherein the microprocessor is configured to operate at a reduced clock rate compared to a clock rate if the microprocessor were to process a demodulated signal at the first frequency, the reduced clock rate selected to extract information from the demodulated signal at the second frequency, the second frequency being sufficiently lower relative to the first frequency so that an incremental power savings is achieved when operating the microprocessor at the selected clock rate.