Mute circuit for audio amplifiers
US5166983A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Jul 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/348
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mute circuit for an audio amplifier has been provided. The mute circuit alternately switches from a normal mode of operation to a mute mode of operation. In the normal mode of operation, the mute circuit utilizes a first op amp circuit to amplify an input signal by a predetermined factor. In the mute mode of operation, the mute circuit utilizes a second op amp circuit which is configured as an unity gain amplifier. In the mute mode, DC shifts occurring at the output of the second op amp circuit are minimized. Further, the second op amp circuit has a low output impedance thereby providing excellent attenuation of an audio input signal when the mute circuit is utilized in an audio amplifier application.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.