Thanks to everyone for their suggestions and information. I'm still
preplexed, but have reached a few conclusions.
Not having a TV, and having the noise appear in recordings made far away
from anything else
electronic has lead me to suspect something other than a TV is the
source.
I considered the possibility that the noise was introduced when I
transfered the recording to a PC,
but have since managed to get the noise when transfering with the
monitor (an LCD job) turned off
and the MD far away from the case of the PC, and so have tentatively
rejected that as the cause.
My current conjectures are
1) Perhaps something strange about the ATRAC compression (not too
likely, in my opinion) or
2) (as stoatwizard suggested) something about the way the mics are
powered (an external box with 9 V battery and a few tiny electronic bits
I haven't identified yet).
The problem isn't always reproducible which makes debugging hard.
Again, thanks for all the hints and suggestions!
Steve P
stoatwizard wrote:
>Do you use an outboard phantom powering unit? You might suspect that.
>I have a cheap and nasty Thomann phantom power unit which puts out
>hash on a band centered on 18kHz.
>
>Problem was solved by inserting the power from six 8.4V NiMH batteries
>and a couple of diodes into the unit. I can now either run off 12V and
>taked the 18K noise hit, or use the 6 NiMH batteries and not take the
>18k noise, which is presumably the frequency the 12V inverter runs at.
>
>But 16K, or excatly 15,625 in my case in Europe, would make me suspect
>TV SET. Not necessarily computer monitor - these have higher refresh
>and field rates nowadays
>
>
>--- In Steve Pelikan <>
>wrote:
> >
> > I've got a number of recent recordings with a significant signal at
> > 16KHz (or 15,792 Hz perhaps)?
> >
>
>
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>
>
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