Patent ID: 8265191

Claim:
A communication system, comprising: a transmitter configured to generate a wireless communications signal representative of digital data by modulating the digital data using Frequency Shift Keyed (FSK) modulation, and transmit the wireless communications signal over a wireless communications channel as an FSK modulated communications signal; and a receiver configured to receive the FSK modulated communications signal and generate receiver output data, the receiver comprising circuitry configured to: convert the FSK modulated communications signal via an analog-to-digital conversion; determine a low tone magnitude signal and a high tone magnitude signal from the converted FSK modulated communications signal; generate an FSK data channel by comparing the low tone magnitude signal to the high tone magnitude signal; determine a low tone threshold based on the low tone magnitude via low tone peak-hold circuitry; generate a low tone Amplitude Shift Keyed (ASK) data channel by comparing the low tone magnitude signal with the low tone threshold; determine a high tone threshold based on the high tone magnitude via high tone peak-hold circuitry; generate a high tone Amplitude Shift Keyed (ASK) data channel by comparing the high tone magnitude signal with the high tone threshold; determine that data on the FSK data channel is invalid data; and in response to determining that the data on the FSK data channel is invalid data, process the low tone ASK data channel to generate the receiver output data or process the high tone ASK data channel to generate the receiver output data.