Composite digital communication system

  • Inventors:
  • Assignees: Nec Corp
  • Publication Date: December 04, 1981
  • Publication Number: JP-S56157150-A

Abstract

PURPOSE:To ensure a reproduction of only the required signal group with a simple demodulator, by giving a different digital modulating system to the signals to be transmitted with every group and then transmitting them with a time-division multiplication given with every group. CONSTITUTION:The signals supplied to the input terminals 11 and 12 are grouped in time division through a multiplying circuit 13. One of the grouped signals is modulated by an FSK modulator 21, and the other one is modulated by a double- phase modulator 22. These modulated signals receive a time-division multiplication through a synthesizing circuit 23 to be turned into a row of signals. At the reception side, the FSK modulated wave is demodulated by a demodulator 24, and the double-phase modulated wave is demodulated by a synchronizing circuit 25. The demodulated signal is applied to a reproducing circuit 26 to reproduce a code, and at the same time selected for only the necessary signal through the circuit 25 to be delivered to a terminal 27.

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