Patent
1978-01-16
1979-07-24
Claffy, Kathleen H.
H04B 324
Patent
active
041623789
ABSTRACT:
Digital echo canceler for a modem for data transmission by means of phase and, possibly, also amplitude modulation of a carrier, the ratio between carrier frequency f.sub.o and modulation rate 1/T having the form P/Q, P and Q being integers.
The echo canceler receives the binary data to be transmitted for generating an echo copy signal. An echo canceler of a simple implementation is obtained in that the echo canceler comprises means responsive to each symbol configuration at each instant iT for generating at least a number depending on the amplitude allotted to the carrier at said instant iT and for applying this number to at least a given section of an assembly of adaptive digital filter whose output signals are combined for forming a digital version of the echo copy signal, the coefficients of these filters being adjusted by an assembly of adjusting circuits receiving said error signal in digital form and arranged for minimizing a predetermined function of said error signal.
REFERENCES:
patent: 3732410 (1973-05-01), Mackechnie
patent: 3903377 (1975-09-01), Sato
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4074086 (1978-02-01), Falconer et al.
patent: 4087654 (1978-05-01), Mueller
patent: 4117277 (1978-09-01), VAN DEN Elzen et al.
Baudoux Jean-Pierre
Macchi Cesar D.
Briody Thomas A.
Claffy Kathleen H.
Myers Randall P.
Streeter William J.
Telecommunications Radioelectriques et Telephoniques TRT
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