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help designing a circuit

what i need is sort of a muting circuit

i need a cicuit that has two audio inputs(we'll call them 1 and 2) and the circuit alows input2 to play continuously untill there is a signal from input1 then input2 will be muted while there is a signal coming from input1 and then once there is no more signal from input1 it will wait for around a minute before it alows sound from input2 again.

sort of so that you can listen to input2 but as soon as something comes from input1 it has priority so that you cant miss it.

has anyone seen anything like this? does anyone know where i can get a circuit diagram for something like that? does anyone have a circuit diagram like that?

Reply to
holmsy
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There are cd players and such for aircraft that do this. When the controller talks, it mutes the stereo output. I don't know how they do it, but it might be a place to start looking.

--
Regards,
   Robert Monsen

"Your Highness, I have no need of this hypothesis."
     - Pierre Laplace (1749-1827), to Napoleon,
        on why his works on celestial mechanics make no mention of God.
Reply to
Robert Monsen

=================================================== Commercial intercoms have this.... zone paging, priority override.... You want to build it or buy it? A simple voice operated relay might work.

Reply to
BobG

I think what you want is what is sold commerically as a "ducking" amp, or typically a ducking circuit on a mixer, or compressor. (For annoying DJs to talk over your favorite songs, etc.) Basically, you extract the envelope of Input1 (full-wave active rectifier with low-pass filter) and feed that to a threshold comparator that runs the mute, including adjustable ramps (fast fade-down and slow fade-up.)

Best regards,

Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis

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Reply to
Bob Masta

Those other guys have good ideas. Bob M touched on what I was thinking which is just a plain mixer - if you really don't need that mute/delay effect. When I was stationed in Germany, rather than annoy people with loud music, I'd mic my acoustic guitar, run the electric to the mixer, and there was another omni mic set up to pick up people speaking. The tape deck ran into the mixer also. We listend with headphones and heard it all.

So if you need an envelope detector to control a mute circuit, that sounds easy. The mute/delay would work similar to an AGC circuit.

What's the application? You need Hi-Fi or what? What are the audio sources and powering requirements?

--
Best Regards,
Mike
Reply to
Active8

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