MULTIPLEX-DEMULTIPLEX TRANSMITTER FOR PULSE-PROCESSING FM AND PWM SIGNAL

摘要

PURPOSE:To attain the multiplex transmission in which 3 or above signals are subjected to pulse frequency modulation and pulse width modulation by applying pulse width modulation to FM signals subjected to pulse processing alternately. CONSTITUTION:An input signal 101 is converted into an FM signal 104 by an FM modulator 1. An identification voltage of the FM signal is changed by a 2nd input signal 102 and the result is identified by a comparator 4. Thus, an output from the comparator is an FM signal pulse 107 whose pulse width is modulated by a 2nd signal. Similarly, the FM signal is an FM signal 108 subjected to pulse width modulation by using a 3rd input signal 103. Then the FM signal is differentiated by a differentiating circuit 2, a waveform 106 is obtained and the signal is used as a clock to operate a 1/2 frequency divider 3. A switch 6 is changed over by using a pulse having the waveform 106 subjected to frequency division and a pulse processing FM signal subjected to pulse width modulation is outputted alternately. The output is a multiplex signal 109.