Adaptive equalizer

Details Adaptive equalizer Adaptive equalizer

1981-08-17

1983-11-15

Gensler, Paul L.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 28R, 333166, 375101, 375 14, 455305, H04B 314, H03H 703

Patent

active

044158726

ABSTRACT:
The dispersive effects of frequency selective fading in a digital, FM, or AM radio system are reduced by means of an adaptive equalizer (11) comprising a cascade of feed-forward stages (1,2, . . . N), each of which includes: a first parallel wavepath (1-1, 1-2, . . . 1-N) including a first adjustable attenuator (20-1, 20-2, . . . 20-N); a second parallel wavepath (2-1, 2-2, . . . 2-N) including a second adjustable attenuator (21-1, 21-2, . . . 21-N) and delay means (22-1, 22-2, . . . 22-N); and means (23-1, 23-2, . . . 23-N) for combining the signals in said wavepaths and for coupling said combined signal to the next stage. By a suitable selection of parameters, according to two unique relationships, a transfer function can be realized which can compensate for amplitude and delay distortions caused by minimum and nonminimum phase fades.

REFERENCES:
patent: 3551854 (1970-12-01), Endo et al.
patent: 3794935 (1974-02-01), Tsuchiya et al.
patent: 3947768 (1976-03-01), Desblache et al.
patent: 3949325 (1976-04-01), Berkovitz
patent: 4125899 (1978-11-01), Kawai et al.
patent: 4156876 (1979-05-01), Debuisser
patent: 4258340 (1981-03-01), Ryu
patent: 4330764 (1982-05-01), Miedema

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