Removing feedback squeal in post at DVinfo.net

Alan Christensen · April 1st, 2003, 01:00 AM

I recently filmed a live performance where there was a 45 second interval of feedback from one of the microphones during one of the songs. When I went to try to remove the feedback squeal during post production, it took me a long time to find the frequency of the feedback sound. I basically kept trying a digital notch filter at various frequencies until I found a frequency where the feedback started to be diminished. Once I was close, it still took me a while to hone right in on the exact frequency so that I could notch it out. This process would have been much easier if I had a spectrum analyzer that would have allowed me to see the frequency of the offending signal. I'd want one that could look at a .wav file and give me the amplitudes of the various frequencies in the interval of interest. Does anyone have a recommendation for some software that provides this function? Or another recommendation for how one would solve this problem?

Ken Tanaka · April 1st, 2003, 01:38 AM

Bias' SoundSoap might make the job a bit easier if you are a Mac and Peak user. (A stand-alone Mac OS-X version is promised.)

Mike Rehmus · April 1st, 2003, 09:17 AM

For PC users, Sound Forge has a spectrum analyzer.

Brian Pink · April 1st, 2003, 09:38 AM

I've used SoundSoap and found it very effective at removing all kinds of extraneous repetitive noises.

April 1st, 2003, 01:00 AM	#1
Alan Christensen Regular Crew Join Date: Mar 2002 Location: California Posts: 139	Removing feedback squeal in post I recently filmed a live performance where there was a 45 second interval of feedback from one of the microphones during one of the songs. When I went to try to remove the feedback squeal during post production, it took me a long time to find the frequency of the feedback sound. I basically kept trying a digital notch filter at various frequencies until I found a frequency where the feedback started to be diminished. Once I was close, it still took me a while to hone right in on the exact frequency so that I could notch it out. This process would have been much easier if I had a spectrum analyzer that would have allowed me to see the frequency of the offending signal. I'd want one that could look at a .wav file and give me the amplitudes of the various frequencies in the interval of interest. Does anyone have a recommendation for some software that provides this function? Or another recommendation for how one would solve this problem?

April 1st, 2003, 01:38 AM	#2
Ken Tanaka Retired DV Info Net Almunus Join Date: Dec 2001 Location: Chicago, IL Posts: 6,943	Bias' SoundSoap might make the job a bit easier if you are a Mac and Peak user. (A stand-alone Mac OS-X version is promised.) __________________ Lady X Films: A lady with a boring wardrobe...and a global mission. Hey, you don't have enough stuff! Buy with confidence from our sponsors. Hand-picked as the best in the business...Really! See some of my work one frame at a time: www.KenTanaka.com

April 1st, 2003, 09:17 AM	#3
Mike Rehmus Wrangler Join Date: May 2002 Location: Vallejo, California Posts: 4,049	For PC users, Sound Forge has a spectrum analyzer. __________________ Mike Rehmus Hey, I can see the carrot at the end of the tunnel!

April 1st, 2003, 09:38 AM	#4
Brian Pink Regular Crew Join Date: Jan 2003 Location: Los Angeles, CA Posts: 94	I've used SoundSoap and found it very effective at removing all kinds of extraneous repetitive noises. __________________ This is the way the world ends.