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Analog/digital telecommunication subscriber station

  • US 4,449,218 A
  • Filed: 10/07/1981
  • Issued: 05/15/1984
  • Est. Priority Date: 10/24/1980
  • Status: Expired due to Fees
First Claim
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1. An analog/digital two-party line system for connection to a two-wire line, comprising:

  • a frequency multiplexer including a multiplex signal output, an analog signal input and a digitial signal input and operable to multiplex analog signals in the telephone band and digital signals in a predetermined band outside of the telephone band;

    a frequency demultiplexer including an analog signal output, a digital signal output and a multiplex signal input, and operable to demultiplex analog signals in the telephone band and digital signals in the predetermined band outside of the telephone band;

    a broad-band hybrid including a two-wire input/output for connection to a two-wire line, a transmission branch connected to said multiplex signal output of said multiplexer, and a receiving branch connected to said multiplex signal input of said demultiplexer;

    a digital transmission circuit connected to said digital signal input of said multiplexer;

    a digital receiving circuit connected to said digital signal output of said multiplexer;

    a first telephone transmitter and a first telephone receiver respectively connected to said analog signal input and said analog signal output;

    an encoder and a decoder respectively connected to said digital transmission and receiving circuits; and

    a second telephone transmitter and a second telephone receiver respectively connected to said digital transmission and receiving circuits.

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