Automatic level control circuit

Details Automatic level control circuit Automatic level control circuit

1987-08-25

1991-08-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330306, 333 171, 381 29, H03F 142

Patent

active

050436767

ABSTRACT:
In an ALC circuit for automatically performing an amplitude compression control operation according to the output level of a low frequency amplifier circuit, the output level of the amplifier circuit is subjected to amplitude compression according to the level of a control signal which is outputted in correspondence to the output level of the amplifier circuit. The differentiation time constant of a differentiating circuit (or cutoff frequency of a high pass filter) provided on the output side of the amplifier circuit is controlled according to the level of the control signal to control the cutoff frequency for the frequency band subjected to amplitude compression.

REFERENCES:
patent: 3934190 (1976-01-01), Dolby
patent: 4068139 (1978-01-01), Bray
patent: 4450413 (1984-05-01), Fujibayashi
patent: 4766395 (1988-08-01), Dolby
McGraw-Hill Concise Encyclopedia of Science & Technology, Second Edition, 1989, p. 192.
Van Nostrand's Scientific Encyclopedia, Fourth Edition, 1968, p. 156.
Jorgen Pohl, "Kassettentechnik & Dolby Systems"--1975.
Geoffrey Shorter, "Dolby Noise Reducer"--May 1975.
Wolfgang Sodtke, "Regelelschalungen mit Feldeffekttransistoren"--1969.

Affiliated with

Also associated with

Rating

Automatic level control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic level control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic level control circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1417042