Device for developing a neutralization signal for an echo suppre

Details Device for developing a neutralization signal for an echo suppre Device for developing a neutralization signal for an echo suppre

1974-08-06

1976-01-27

Olms, Douglas W.

Telegraphy

Systems

Printing

178 58R, 340171R, H04B 320

Patent

active

039354032

ABSTRACT:
The invention comes within the branch of digital data transmission on a telephone line having four wires comprising echo suppressors. In order to be able to neutralize these suppressors during a simultaneous bilateral data transmission, a neutralization signal is developed in a purely digital device basically using a PCM coder, counting the changes in sign of the line signal. The use of digital filters to identify the characteristic frequency preceding the transmission is thus avoided.

REFERENCES:
patent: 3069501 (1962-12-01), Gilman et al.
patent: 3647993 (1972-03-01), Foulkes et al.
patent: 3783194 (1974-01-01), Vilips et al.

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