Automatic level control circuit with improved attack action

Details Automatic level control circuit with improved attack action Automatic level control circuit with improved attack action

2007-11-20

2007-11-20

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S129000, C330S141000, C330S278000

Reexamination Certificate

active

11187281

ABSTRACT:
An automatic level control circuit comprises a gain controllable amplifier, a comparing and outputting circuit which compares a level of an output signal from the gain controllable amplifier with a reference level and outputs a result of comparison as a comparison result signal; an output signal restricting circuit which restricts the comparison result signal obtained in a period between one zero crossing point and another zero crossing point of the input signal such that a portion of the comparison result signal obtained within a predetermined output time is output, and an attack detecting and outputting circuit which restricts an output signal from the comparing and outputting circuit to the portion of the comparison output signal obtained within the predetermined time when the comparison result signal is output over the predetermined output time and outputs the restricted comparison result signal as an attack detection output signal.

REFERENCES:
patent: 5423081 (1995-06-01), Thiele et al.
patent: 6670849 (2003-12-01), Damgaard et al.
patent: 7164315 (2007-01-01), Camnitz et al.
patent: 11-328855 (1999-11-01), None
English Patent Abstract of JP11328855 from esp@cenet, published Nov. 30, 1999, 1 page.

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