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US6931124B1 - Soft mute circuit - Google Patents
https://patents.google.com/patent/US6931124B1/en#:~:text=A%20soft%20mute%20circuit%20includes%20a%20programmable%20amplifier,increasing%20or%20decreasing%20the%20gain%20of%20the%20amplifier.
Muting Circuits For Audio - sound-au.com
https://www.sound-au.com/articles/muting.html
If no RF signal is received, you will normally hear white noise because the receiver operates at maximum gain and amplifies external noise as well as internal circuit noise. The muting circuit cuts out the background noise, but is released as soon as an RF signal is received. Another form is called 'ducking', common in broadcast systems.
Build a simple, soft-action muting switch - EDN
https://www.edn.com/build-a-simple-soft-action-muting-switch/
Making Q 1 a more tightly defined PN4392 can soften this requirement and allow muting of lower impedance signals. R 3 unloads S 1 from R 2, so that D 3 does not shorten the earlier transition times. S 1 's normally closed contact, resistor R 1, and dual-LED D 2 add an indicator light. D 1 raises the red LED's on-state threshold to indicate green when muting is off.
US6931124B1 - Soft mute circuit - Google Patents
https://patents.google.com/patent/US6931124B1/en
A soft mute circuit includes a programmable amplifier controlled by a register. Data is stored in the register from an adder that combines the current data …
Soft-Action Mute Switch - EEWeb
https://www.eeweb.com/soft-action-mute-switch/
This simple circuit is a line-level audio signal muting switch based on a soft-action power on/off process. When the S1 switch is closed, R4, C1 and Q4 JFET quietly ground the signal to be muted in between 100 to 200 ms and the RED indicator light goes on. When the S1 is opened the signal is released and the GREEN led goes on.
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