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Need recommendations to design an anti-feedback device

Randall Landry
Prodigy 40 points


Hello,

I build and sale effect pedals (similar to guitar effect pedals) for harmonica players. I wish to add an anti-feedback pedal to me product line. I am searching for a design firm who can provide a schematic for this project. Harmonica players typically hold a microphone in their hands while playing in front of or near their amplifier and this setup is very feedback prone as can be expected. I am looking for a simple device with few controls and can operate off of 9 volts.

Can anyone recommend a firm that can provide this service?

Thanks,

Randall Landry

www.lonewolfblues.com

 

 

  • 0
    TI__Expert 3595 points

    These exist for the world of live sound:

    http://www.free-scores.com/boutique/boutique-uk-frame-eur-acc.php?clef=60048&CATEGORIE=600

    Is an example.  It is mostly something wtih a DSP not so much an amplifier.

    Chris

  • 0 in reply to Chris M
    Prodigy 40 points

    Thanks Chris,

    This does provide the function but the product I want to produce will fit on a pedal board and will be similar to this product http://www.kinder-instruments.com/afb+.htm

    I am a electronic tech who and studied vacuum tubes in trade school, I started building pedals for harmonica players a few years ago and have been able to design my products to date but DSP is really over my head.I am confident in my market so I decided to seek out a firm or an individual to design a schematic for me.

    Yes I agree that a DSP device may be the way to go, should I post this request on a different forum?

     

    Thanks,

    Randy

    www.lonewolfblues.com

  • 0 in reply to Randall Landry
    TI__Expert 3595 points

    Yes, I think that it would be better for this to be in the DSP forums.  Other than studying DSPs in college for a semester, I am pretty poor in that area.  Most of these anti-feedbackers work with a bunch of narrow notch filters that can be tuned to the frequencies that are squealing.  Problem always is to differentiate feedback from the desired sounds (drone notes can be indistinguishable).  How I have seen the Behringer used is that at soundcheck you ring out all the bad frequencies, and then lock the device so that you don't have it trying to find "new" frequencies during the show. 

    Having worked in live sound on the side for years, I know the trouble that harp guys have, old omnidirectional mics combined with cupping the mic and a loud distorted amp.  Any one is killer for feedback, but all, oof!

    chris

  • 0 in reply to Chris M
    Prodigy 40 points

    Yes that is exactly the problem, I will post on the DSP forum

     

    Thanks,

    Randy