Title: Device for developing a neutralization signal for an echo suppressor

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.

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Inventors: Penicaud, Etienne (Chaville, FR)
Lienard, Maurice (Marseille, FR)

Application Number: 495213
Filing Date: 1974-08-06
Publication_date: 1976-01-27
Assignee: Compagnie Industrielle des Telecommunications Cit-Alcatel (FR)
Primary Class(es): 379/406.15 340/825.71, 370/286
Other Classes:
US Patent Ref:

3069501	Dec, 1962	Gilman et al.	179/170.
3647993	Mar, 1972	Foulkes et al.	179/170.
3783194	Jan, 1974	Vilips et al.	179/170.

Other Refs:
Primary Examiner: Olms, Douglas W.
Assistant Examiner:
Attorney: Craig & Antonelli