Patent
1983-10-06
1986-02-18
Rubinson, Gene Z.
1791706, H04B 320
Patent
active
045714657
ABSTRACT:
An echo canceller used in a data transmission modem for cancelling in the baseband signal of the receive path an echo signal .epsilon.(t) produced by the data signal from the transmit path. The echo canceller comprises a difference circuit for forming the difference between the signal from the receive path s(t)+.epsilon.(t) and a synthetic echo copy signal .epsilon.(t). The echo copy signal is formed by at least one transversal filter which operates at a sampling frequency equal to the frequency of the data and whose coefficients are adjusted to minimize the mean-square value of an error signal. This error signal e(n) at an actual sampling instant n of the filter is determined by forming the difference between the value of the output signal of the difference circuit at the instant n and the value of this signal at the preceding sampling instant (n-1), which has been multiplied by the ratio between the value of the data recovered at the instant n and the value of the data recovered at the instant (n-1). Also provided is a circuit for providing an error signal for controlling the filter coefficients as a function of the sign of the difference circuit out signals for the actual and previous sampling instants.
REFERENCES:
patent: 3821493 (1974-06-01), Chiba
patent: 4007341 (1977-02-01), Sourgens et al.
patent: 4479036 (1984-10-01), Yomamoto et al.
Brie Richard
Guidoux Loic B. Y.
Eason Leroy
Radioelectriques et 501 Telecommunications
Rubinson Gene Z.
Streeter William J.
Vaas R.
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