Echo suppressor circuit

Details Echo suppressor circuit Echo suppressor circuit

1978-01-03

1979-08-21

Claffy, Kathleen H.

1791706, 1791708, H04B 320

Patent

active

041654498

ABSTRACT:
Disclosed is an echo suppressor circuit which provides a variable loss in a speaker's transmit path, which loss is a function of the relative speaker volumes. The loss provided in the path of a particular speaker is relative to the volume of the speech emanating from each speaker. In one embodiment, the amplitude of the incoming signal is reduced by an amount which is a function of the ratio of the amplitude of the incoming signal to the amplitude of the outgoing signal. Because loss is introduced into a distant speaker's transmit path rather than into his return path, it is possible for a near speaker to break into a conversation before the distant speaker has concluded. Further, since the loss provided is a function of the relative volumes of both speakers with respect to one another, the total loss introduced into the system is minimized.

REFERENCES:
patent: 3560669 (1971-02-01), Foulkes et al.
patent: 3647993 (1972-03-01), Foulkes et al.
patent: 3942116 (1976-03-01), Ferguson
patent: 3973086 (1976-08-01), May, Jr.
patent: 3985979 (1976-10-01), Durand et al.
M. J. Birck; "Improved Echo Suppression in Long Telephone Circuits"; Telephony; Mar. 29, 1971; p. 23 et seq.
P. T. Brady & G. K. Helder; "Echosuppressor Design in Telephone Communications"; Bell System Technical Journal; Nov. 1963; pp. 2893-2917.
J. W. Emling & D. Mitchell; "The Effects of Time Delay and Echoes on Telephone Conversations"; Bell System Technical Journal; Nov. 1963; pp. 2869-2891.
R. R. Riesz & E. T. Klemmer; "Subjective Evaluation of Delay and Echo Suppressors in Telephone Communications"; Bell System Technical Journal; Nov. 1963; pp. 2919-2941.

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