Magnetoresistive audio limiter
US5724434A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1996 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Nov 7, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G9/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.