A system utilizes a single receiver to simultaneously receive and demodulate both amplitude shift keying (ASK) messages and frequency shift keying (FSK) messages. The single receiver is used to demodulate the FSK modulated message and the single receiver provides a received signal strength indicator...http://www.google.com/patents/US20050232376?utm_source=gb-gplus-sharePatent US20050232376 - System/method for receiving ASK and FSK signals using a single RF receiver
