Noise gate circuit

[Aurora]

I'm operating a fairly large ClearCom partyline intercom circuit, with some extension spurs that use IP codecs. As the ClearCom type cct's don't have a key line, I'm left with the codec's "Send on Level" function, which for some reason does not seem to be optimal, as outgoing messages end up being somewhat broken up. I'm pretty sure this is not a network related problem, as incoming messages that are sent by "Talk key trigger", as crystal clear and stable.

To solve this, I'm looking for a noise gate cct- or unit- that can give me a reliable audio activated trigger line, preferrably a commercial unit, but home built is also OK. There are lots of commercial noise gates, but I need the trigger line . not a gated audio line.
If anybody have any pointers, I'd really appreciate it!
( Google have sofar not found what I need..... )

[fperron_kt88]

Hello Aurora,

I am not sure I understand your problem completely and perhaps there is a simple way to do this with the unit you have, but my intuition tells me that the "noise gate controlled from another signal" function block you need could easily be implemented with a compressor's side chain. Something similar to what the DJs are using to automagicaly turn the music down while they talk to the crowd with their mike...

Anyway, good-luck with this, maybe the more experimented folks will have a better understanding/solution for your issue!

[rsalinger]

From what I can tell, perhaps you're looking for a "ducking expander" instead of a "gate"?

Aphex Expander/Gates are excellent units.

Cheers,
Rob