Signal generator for producing pulse signals for a remote control

Abstract

A signal generator for producing a pulse width modulated signal for highly reliable remote controlling. Binary signals (2.sup.0 to 2.sup.3) are coupled into respective input terminals of a shift register (8) having a predetermined number of flip-flop stages (FF 21-FF 24), producing a serial output pulse train having a specified number of pulses comprising broader pulses and narrower pulses. The output pulse train from the output terminal (Q24) of the last stage (FF 24) is coupled to an output pulse generating circuit (11) for pulse width modulation, and an inverted output from the other output terminal (Q24) is coupled into the first stage input terminal (D21) of the shift register (8), thereby producing a pulse train consisting of a combination of a first part and a second part, the second part having an opposite relation between its broader pulses and narrower pulses to that of the first part. Thus, the time interval for the total pulse train consisting of the first part and the second part is constant regardless of the contents of the input binary signal.