Soft switching circuit for audio muting or filter activation

Details Soft switching circuit for audio muting or filter activation Soft switching circuit for audio muting or filter activation

1992-05-04

1995-08-22

Skudy, R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

381 94, 327311, 327384, H04B 1500

Patent

active

054443121

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.

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Sedra & Smith, "Micro-Electronics Circuits", (1982), at 34 and 306-310.

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