Digital remote control transmission apparatus

Abstract

A digital remote control apparatus for transmitting digital instruction signals to a controllable apparatus includes a transmitter for transmitting a coded digital instruction signal composed of a sequence of synchronization pulses having a predetermined period and data pulses each inserted between successive synchronization pulses at predetermined positions therein dependent upon whether the data pulses represents a '0' bit or a '1' bit. The receiving apparatus distinguishes between '0' and '1' bits by detecting the length of an interval between the leading edge of a synchronization pulse and the leading edge of an adjacent data pulse and determines the existence of noise if more than one data pulse is detected between successive synchronzation pulses. In this way, information decoding is facilitated by enabling the length of each data word to be constant, regardless of the number of ones and zeroes in the word, and also facilitates the detection of communication transmission error by detecting the presence of more than one data pulse between successive synchronization pulses of a constant period as being noise.