Peter,
How curious! I downloaded the sound clip and looked at it in iZotope
RX. No anomalies show up in the spectrogram but they do in the
waveform, and the levels jump upwards according to the levels meter
(but not audibly), in a cyclic pattern unrelated to the birdsong.
I have no explanation for this phenomenon. But it does seem to be a
lesson for people to keep their batteries fresh. A chap I know
changes his K6 gun mic battery daily 'whether he needs to or not', on
recording trips.
Vicki
On 27/10/2013, at 9:18 AM, Peter Shute wrote:
> I recently left my ME66 switched on overnight, and when I
> discovered this in the morning and switched it off and on again,
> the battery confirmation light was very dim.
>
> The first recording I made after that seems ok, but a couple after
> that show a bias in the signal, showing in the waveform as a funny
> shaped wave, repeating every 4 seconds or so. Later in the day this
> decreased to about 1 second, although the recordings sound ok to me.
>
> I've uploaded a sample to http://snd.sc/1a7KEuG
>
> Is this bias the normal result of a dying battery? When I tested it
> again just now before changing the battery, it seemed ok again,
> perhaps because the battery had recovered a bit. I've left it on to
> see if I can replicate the problem.
>
> I'm not at all concerned about saving the recording, only about
> whether the mic is faulty or just needed a fresh battery.
>
> Peter Shute
>
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