Circuit for automatic gain control

Details Circuit for automatic gain control Circuit for automatic gain control

1986-01-17

1987-05-19

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330141, 330284, 360 67, 360 68, H03G 330

Patent

active

046671676

ABSTRACT:
The invention relates to an automatic gain control circuit, preferably in magnetic recording and/or reproducing equipment, having a first input (1) and a second input (3). The impedance at output (5) of the automatic gain control circuit, when activated, is reduced to control the levels of the signals applied to the first input (1) and the second input (3), which impedance reduction in the case of actuation in response to signals applied to the first input is effected with a smaller time constant than in the case of actuation in response to signals applied to the second input. An audio signal without high frequency pre-emphasis is applied to the first input (1) and the same signal with high-frequency pre-emphasis is applied to the second input.

REFERENCES:
patent: 3790896 (1974-02-01), Shimizu et al.

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