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Old January 29th, 2005, 10:49 AM   #1
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Removing XL1 tape transport hum?

Hi. I am working on postproduction on a documentary shot mainly with an XL1 (no S). When the camera-mounted mic is used, there is a distinct hum, presumambly coming from the tape transport. I am using Final Cut and have been trying to remove the hum but I can't seem to find the exact frequency. Has anybody experienced this, found the frequency and succesfuully removed it? It shouldn't be difficult, but for some reason I can't seem to get it right. Any suggestions?

I have been considering exporting the whole project to Digital Performer --my main audio tool-- where I can preview the audio while affecting an equalizer's parameters in real time... just to find the frequency! Nuts!
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Old January 29th, 2005, 10:54 AM   #2
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A third party app like "Sound Soap" will help, but I am afraid exporting it for work is going to be the solution.

Quick question, did the XL1 you used, have a FU-1000 viewfinder? If so, this is likely the source of your hum, rather than the transport mechanism. The viewfinder comes with a microphone shield to prevent interference, and if you leave it off, their is a POSSIBILITY the mic will pick up some hum. Not always though.
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Old January 29th, 2005, 11:22 AM   #3
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It was the default color LCD viewfinder, not BW CRT, but I don't know the model. The hum is low pitched, I think the fundamental is somewhere between 100 and 200 Hz, so by default I expected it to be from the transport. I tend to relate displays, especially CRTs, to high frequency noise.
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Old January 29th, 2005, 01:13 PM   #4
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Try working backwards.
Use a parametric/notch EQ filter to boost a very narrow range of frequencies. Adjust the frequency range until you make the problem really bad, then notch out that frequency and all the relevant harmonics.
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Old January 29th, 2005, 01:25 PM   #5
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Tried that trick, and ended up focusing on 105 Hz, but the hum wouldn't totally go away. I just thought that maybe the Xl1, being such a popular camera, had a well known noise so perhaps some of you great folk had been though this and found the exact frequency. I'll post again if I end up finding a frequency or set of frequencies that better match the noise. Thank You for the help.
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Old January 29th, 2005, 03:49 PM   #6
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I'm cutting a doc right now, that I shot on an XL1 and my new XL2. I've never had transport noise on the XL1, though I did have a very very high pitched noise imparted by the 16x. Shipped it back to Canon, and they cleaned the contacts, and 'changed a fuse' in the lens.
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