| 摘要 |
PURPOSE:To make stable multiplexing possible without receiving restrictions of transmission power and used band width by transmitting the tone frequency corresponding to the channel together with time division analogue telemeter signals. CONSTITUTION:In transmission-side unit 4, input switch 9 selects input signals 1a...1n of respective channels at every fixed time and outputs a tone frequency corresponding to a transmitting chanel to tone oscillator 10 simultaneously with transmitting input signals to signal/frequency converter 2. Selected signals are transmitted together with tone signals through signal/frequency converter 2 and modulator 3. In receiving-side unit 6, input signals from transmission line 5 are restored by demodulator 7 and frequency/signal converter 8, and simultaneously, tone detector 11 detects the tone frequency to open analogue memory 12 corresponding to the receiving channel, and restored signals are stored. |
