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JVC GY-HM 70/100/150 Series Camera Systems
GY-HM70, HM100, HM150 recording AVCHD MP4 & QuickTime .MOV to SDHC cards.

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Old October 10th, 2010, 08:10 AM   #1
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Join Date: Nov 2009
Location: Sydney, Australia
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Weird Audio Phasing

I use a HM100 with a Rode NTG-1 shotgun mic, set to auto gain

i noticed on a recent shoot that i'm now editing, with headphones you can hear what i can only describe as phasing

it's as if the internal mic is on because camera moves cause a definite change in phase, which almost gives you a headache after a while

is the internal mic definitely bypassed with a 48v mic plugged in? or is there a setting?
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Old October 10th, 2010, 10:23 AM   #2
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Join Date: Dec 2003
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If the camera itself is not at fault, maybe there is a feedback going on between your headphones and the Rode mike which is pretty sensitive if you are using it close to the camera.

I don't know the new camera so cannot comment on whether the internal mike and external mike can both be selected active together.

Auto gain on each channel might be slightly different in attack and release times. Does the effect go away if you select the channel output to the headphones to be mixed or "mono".

If you are splitting a single channel feed to two channels and have separate auto gain on both of those channels or selected "on" for just one as a method of bracketting your levels for safety, you might also get that effect.

Take more notice of people smarter than me who comment in reply.

Last edited by Bob Hart; October 10th, 2010 at 10:29 AM. Reason: error
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