Selection between separately received messages in diverse-frequency remote-control communication system

摘要

In a remote-control communication system, a signal generating unit includes a first signal transmitter for transmitting a first signal at a first frequency, such as UHF, a second signal transmitter for transmitting a second signal at a second frequency, such as an infrared frequency, that is diverse from the first frequency; a keyboard for generating an information signal containing a given message, which is modulated onto both the first signal and the second signal; wherein both the first and second modulated signals are transmitted in response to a key of the keyboard being pressed to generate the information signal. A receiver for the system includes a microcontroller for processing the given message to control a given operation of an electronic communication apparatus; a UHF detector and demodulator unit and an infrared detector and demodulator unit, which respectively detect and demodulate the first and second modulated signals to provide the information signal containing the given message. The microcontroller also processes both the information signal provided by demodulating the first modulated signal and the information signal provided by demodulating the second modulated signal to select the given message for operation-control processing by the microcontroller from either the information signal provided by demodulating the first modulated signal or the information signal provided by demodulating the second modulated signal.