Patent ID: 7702038
Filing Date: 2010-04-20
Classification: B60C,B60R,G07C,H04B,H04L

Abstract:
1. A method of operating a radio frequency (RF) receiver for an automobile comprising the steps of: operating the RF receiver in a first mode for receiving Frequency Shift Keyed (FSK) modulated transmissions for a first period; switching the RF receiver to a second mode for receiving an Amplitude Shift Keyed (ASK) modulated transmission for a second period, shorter than the first period; switching the RF receiver back to the first mode responsive to the RF receiver determining that an ASK modulated transmissions is present; switching the RF receiver back to the second mode after a first known time interval such that the RF receiver can receive a second ASK modulated transmission; and maintaining the RF receiver in the second mode after the first known time interval to received the second ASK modulated transmission.