Magnetoresistive audio limiter

Details Magnetoresistive audio limiter Magnetoresistive audio limiter

1996-11-07

1998-03-03

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381104, H03G 300

Patent

active

057244340

ABSTRACT:
A voltage controlled audio attenuator, of particular benefit in audio limiters, is created by configuring a nearly-balanced four-resistor bridge such that at least one of the branch resistors is implemented as a magnetoresistive element, located in a variable magnetic field, typically generated by a coil energized by current from an electronic driver which is made controllable from a DC control voltage, which is thus enabled to control the attenuation of the bridge. A suitable feedback processing circuit, receiving input from the bridge output and producing the DC control voltage in a predetermined dynamic relationship, forms the feedback branch of an automatic loop, thus the voltage-controlled attenuator is utilized as a key element of an audio limiter.

REFERENCES:
patent: 4406923 (1983-09-01), Burne, III et al.
patent: 4905291 (1990-02-01), Strickland
patent: 5049809 (1991-09-01), Wakatsuki et al.

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