×

Transmission method for transmitting voice and data information over telephone line and device for implementing said method

  • US 4,479,213 A
  • Filed: 07/19/1982
  • Issued: 10/23/1984
  • Est. Priority Date: 07/28/1981
  • Status: Expired due to Term
First Claim
Patent Images

1. A transmission method for simultaneously transmitting voice signals covering a given frequency bandwidth and pure data provided by digital terminals over the same telephone line, said method including:

  • processing the voice signals for extracting a low frequency band analog signal, i.e., a base band signal and characteristic voice parameters therefrom;

    digitally coding said characteristic voice parameters;

    multiplexing said pure data with said digitally coded characteristic parameters;

    converting the multiplexed data into analog signal(s);

    adding said analog converted signal(s) to said analog base band; and

    transmitting said added signal(s) over the telephone line(s).

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×