Method and device for protecting modems against echoes

Details Method and device for protecting modems against echoes Method and device for protecting modems against echoes

1987-05-29

1989-04-18

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

375104, 379406, H04B 320

Patent

active

048233390

ABSTRACT:
The device for providing protection against echoes includes a level memory (33) for storing a value Gs and a comparator (34) for comparing the level Gx provided by an AGC device (31) upon receipt of a message with a value Gs stored in the level memory (33) and for supplying a resetting signal to the equalizer (35) for resetting the coefficients thereof to zero together with a signal for storing the level Gx as a new value Gs in the level memory (33) where Gx exceeds Gs by a predetermined value, or for supplying a signal for inhibiting the decoding of the data signals where Gx falls short of Gs by a predetermined value, thereby indicating that the received message is an echo.

REFERENCES:
patent: 4009356 (1977-02-01), Borysiewicz et al.
patent: 4044307 (1977-08-01), Borysiewicz et al.
patent: 4593399 (1986-06-01), Baugh et al.
patent: 4694450 (1987-09-01), Staab
G. Larsen & P. Besslich; An Improved Receiver for Baseband Data Communication Using A Digitally Controlled AGC; Int. Journal Electronics; 1977; vol. 43, No. 6; pp. 593-598.

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