On Fri, 2 Mar 2001 19:42:24 -0000, "Mark" wrote:

>> I did - you are quite right (I was fooled by the similarity
>> to normal hum), the noise is from mechanical pickup with
>> the tape in place and camera on in camera-mode... I was
>> unable to reduce it (other than by using the mic pad and
>> Cool Edit noise reduction, as mentioned before...) - I
>> tried mounting the mics on a side handle ("hum" + handling
>> noise), on a mic "standoff" in the camera shoe (no
>> improvement in "hum"), with rubber disks added to the
>> standoff (no improvement), and I'm wondering where to go
>> next... (I use two MKE300s, for "stereo"). Ah, well...

>Do you see where I am coming from now on the theory that Sony have
>deliberately set the internal mic low to the point that motor vibration/hum
>is not picked up. I don't know where to go either, other than mount the mic
>off camera, which is not ideal for my applications.
[...]

No...
As I said, raising the level in post of the track
using the internal mic does not result in this
"hum" showing up... I think it has more to do
with trying to take greater advantage of the available
dynamic range by not compressing the sound as much
as usual in the AGC - and this forces a lower average
level to "clear" the relatively higher peaks that
result...