Soft switching circuit for audio muting or filter activation
US5444312A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1992 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | May 4, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/34
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A soft switching circuit gradually connects an audio signal to zero reference level to mute the audio signal, or connect a filter to enable the filter. A MOSFET is connected between the audio signal and the zero reference level. A resistor-capacitor circuit is connected to the gate of the MOSFET and receives the MUTE or FILTER* signal from the computer system. When the MUTE or FILTER* signal changes condition, the RC circuit provides a signal to the MOSFET gate that changes relatively gradually. Consequently, the drain-to-source resistance of the MOSFET also changes from short circuit to open circuit or vice versa relatively gradually.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.