mic feedback & tone control IC's

Oct 10, 2005 4 Replies

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exxos 20 years ago

Hi all,

trying to cure for mic feedback, have the idea of cutting down on some frequencies which maybe help prevent it. I am looking for tone control chips or graphics equalizer IC's, there does not seem to be anything on the market past audio cpu's which need I2C programming etc, a bit over the top for a simple device... I could build one using small op amps and various values of caps, which will probably end up doing, but before I invest in the PCB area (and assembly time) I wonder if anyone has spotted any simple dedicated chips around ?

Cheers, Chris

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JeffM 20 years ago

Acoustic feedback is usually controlled with a notch filter.

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Jasen Betts 20 years ago

the pros use a 1/3 octave graphic equaliser to do that.

there are typically many different feedback paths in any situation that's whay they use the expensive 20 channel graphic equaliser.

no. but another route to try is frequency shifting.

if the mic is not to be used a purpose where Hi-fidelity is essential. shifting the frequency up 10Hz or so will defeat a lot of feedback. There was a project in PopTronics or EA, or Silicon Chip >15 years ago that did that.

Bye. Jasen

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exxos 20 years ago

ahh, looks like that will do the job, things have so many names its hard to keep track at times :-\

Chris

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exxos 20 years ago

hmmm, interesting idea, am totally clueless with that, but should make a nice google session, something to look into for sure.

Chris

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