Multiplexed dual tone multi-frequency encoding/decoding system for remote control applications

摘要: A multiplexed dual tone multi-frequency (DTMF) encoding/decoding system for remote control applications is provided whereby simultaneous combinations of activated switches may a device at location via conventional DTMF encoder/decoder system. The utilizes unique multiplex type signaling technique to increase the previously possible number coded signals generated and correspondingly decoded. Each desired combination results in activation, by first read only memory an oscillator-divider, pair data lines which turn activate encoder, resulting generation tones alternating sequence are transmitted over single channel communications link decoder. decoder converts each signal code, activating lines. pulse stretcher then holds state corresponding one while second received converted additional third receives four encoded activates relays or other devices. filter/momentary hold array be added between eliminate extraneous provide smooth transistion changes switches.