Feed forward dual channel automatic level control for dual tone

Details Feed forward dual channel automatic level control for dual tone Feed forward dual channel automatic level control for dual tone

1984-06-01

1986-08-05

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

179 84VF, 381107, 455235, 455239, H04B 116, H04M 150

Patent

active

046047557

ABSTRACT:
A dual tone multi-frequency receiver having an improved automatic level control is described. The level control is performed after the filtering operation instead of before the filtering operation as was done in previous designs. Separate channels are derived for each of the tone groups and are handled separately for automatic level control in feed forward responsive correction circuits. Improved responsiveness to twist distortion with a fast attack tracking and holding capability results.

REFERENCES:
patent: 3539731 (1970-11-01), Legedza
patent: 3909549 (1975-09-01), Tarridec et al.
patent: 4145580 (1979-03-01), Hasegawa
patent: 4206323 (1980-06-01), Padgett et al.
patent: 4273965 (1981-06-01), Cowpland et al.
patent: 4386239 (1983-05-01), Chien

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