Oh yes, there it is. I wasn't zoomed in enough. I couldn't notice the sound=
originally but listening to the right channel again there is a slight 'fiz=
z'.
The fact that the frequencies are spaced out by the same amount up the spec=
trum rather than being multiples is interesting.
--- In vickipowys <> wrote:
>
> The harmonics definitely show up using Izotope RX, just in the right
> channel. I can't really hear any difference between the channels. I =
> don't know what is causing the harmonics but I should think it must
> be either a faulty capsule or a poor connection. Perhaps touching
> the capsules with the towel caused an earthing issue?
>
> Vicki
>
>
>
>
> On 11/03/2012, at 9:50 PM, doctorobotnik wrote:
>
> > It would probably help if I included the link :)
> >
> > http://i.imgur.com/so7CG.jpg
> >
> > --- In "doctorobotnik"
> > <cookcommaben@> wrote:
> >>
> >> Hi Peter,
> >>
> >> This is how your test file looks in Audition's spectral view. I
> >> don't see the harmonics you noted in the right channel. Perhaps
> >> it's a quirk in Audacity. Do you have access to another spectrum
> >> renderer to try the file on?
> >>
> >> Ben
> >>
> >> --- In Peter Shute <pshute@> wrote:
> >>>
> >>> Yesterday morning I made a 20 minute recording at the local
> >>> wetlands with my new SASS array (4 x EM172's in a Rob Danielson
> >>> style wooden structure, half finished - no nose baffle or
> >>> internal baffling). I also made a recording using the Sony PCM
> >>> M10's internal mics for comparison.
> >>>
> >>> When I loaded into Audacity and displayed the spectrogram, I see
> >>> lots of bands on the right channel, about 400Hz apart, to 20kHz
> >>> and beyond. I can't see any sign of them in the left channel, and =
> >>> I can't believe this thing has such good separation that it could =
> >>> be environmental. I can't hear anything odd, but with my hearing, =
> >>> that doesn't mean much.
> >>>
> >>> I also see no sign of it in the recording using the internal mics.
> >>>
> >>> So it must be generated in the mic circuitry? I just made another =
> >>> test recording with it on the table here beside me, and I see no
> >>> sign of the bands on that recording either.
> >>>
> >>> So maybe it picked up some interference with it's unshielded
> >>> wiring? Maybe, but would that look like this? And I was at least
> >>> a kilometre from the nearest powerlines. The site is an old
> >>> saltworks, so there may have been some pumps running a bit closer =
> >>> than that. The lead to the M10 is only metre long, and shielded, =
> >>> but there are a few inches of unshielded wiring in the array.
> >>>
> >>> More intriguingly, the first 20 seconds of the recording don't
> >>> show the bands. This includes the sounds of me wrapping the array =
> >>> in a towel for wind protection. The last part, where I unwrap it
> >>> again, also doesn't show the bands. That I don't understand at
> >>> all. Unless perhaps my close presence somehow damped some
> >>> interference?
> >>>
> >>> I've uploaded one minute of it in wav format if anyone wants to
> >>> have a look at it: http://soundcloud.com/petershute/sass-test-
> >>> harmonics. The first 20 seconds is very noisy and clipped, but
> >>> I've had to include it to show the band free section.
> >>>
> >>> Peter Shute
> >>>
> >>
> >
> >
>
|