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Hi All, I have recently hosted and video'd a martial arts seminar and found that on zooming in there is an increasingly loud buzz on the track. In the accompanying video it starts around 14 seconds in. I have Audacity and Adobe Premiere 6.5 available.
Any idea why its happening and the best way to remove it?
Cheers
Bill
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As a quick and dirty first pass you could try to record silence with zooming in. Then 'subtract' this track by inverting the phase.
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Cheers, I'll give that a go.
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It only works that way for exactly and identically reproducible items, and that zooming is not one of them. What you will end up with is EXTRA, comb-filtered zoom noise.
Scott -
After listening to it, it sounds like you need a harmonic (buzz) filter. Also known as a comb filter. Could be listed under a diff name in Audacity though. You pick the fundamental frequency (usually around the power/mains frequency of 60Hz in US/Canada), and it will create a notch filter for that frequency, plus harmonics (integer overtones) of the fundamental. It won't be perfect, so don't get your hopes up (particularly since the volume changes). Plus, there are other, enharmonic tones in actual real-life buzz, which wouldn't be affected.
However, you've got worse things to deal with already: that recording is ridiculously low and hollow due to the mic being on-cam and so far away from the subject that the subject is nearly equal (aka LOW) in volume to the room ambience. This CANNOT be removed (certainly not removed WELL). Maybe you could do an ADR-like reverse-lip-synced commentary instead.
Scott -
Does the buzzing stop when you stop zooming?Originally Posted by LabanB
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Cheers for the replies.
No the buzzing gets louder the closer I zoom in and remains until I pull out.
Bill -
Does your camera have an "anti-shake" feature? The longer your focal length, the harder an anti-shake would have to work to avoid shake. It is a motor that works in the opposite direction to the shaking in order to counteract it, and it might be the motor that is buzzing.. If it exists (AS), it usually can be turned off.
Scott -
What's the brand and model number?Originally Posted by LabanB
Has it always buzzed or just start recently? -
I have anti-shake turned on. I'll turn it off and see what happens.
I haven't used the camera for a while, so I can't remember if its been there. I think it only became noticeable after I bought the boom mike.
Sony Handicam DCR-PC120E PAL and the mike is Sony ECM-HS1
Bill -
Disconnect & remove the ECM-HS1 mic so that you're only using the onboard one.Originally Posted by LabanB
Is this buzzing still there?
I checked a video of the DCR-PC120E on YouTube. The guy zooms and there's no buzzing audible.
https://www.youtube.com/watch?v=FP0bUsVHZ74
So if removing the mic doesn't stop the buzzing, it's most likely the camcorder itself has (developed) a fault.
If the buzzing does stop, then get a different mic as the ECM-HS1 must be the problem. -
Cheers Mike, the buzzing only occurs on zooming, not all the time it's connected, which is what is puzzling me.
Bill
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