Walt
The MZ-R70 does not have a line out, just two
headphone outputs that Sony recommends connecting to
stereo inputs with volume set to max. On the same
recording site I also connected my digital camcorder
to the SASS and I have transferred the audio/video by
means of Firewire to my computer. I'll post a sample
of the audio to my web page as soon as I figure out
how best to do that. The camcorder specs claim 16 bit
sound.
By the way, the video seems to show some larger,
darker frogs,(Leopards?) attacking the smaller pink
frogs (Wood?). Would this be normal?
I'll try your pillow method for testing self noise.
Greg Kunkel
--- Walter Knapp <> wrote:
> Gregory Kunkel wrote:
> > The site was only 50 meters from the Long Island
> Sound
> > and even though the wind was minimal there was a
> low
> > surf running. Out on the beach the low frequency
> > environmental sound was overwhelming even the call
> of
> > the gulls. The recording site is shown on the
> lower
> > photo on my web page. The only filtering I did was
> to
> > run the output of the MD through a graphic
> equalizer
> > with frequencies below 250 Hz set to -12db. I am
> still
> > experimenting with the settings for recording
> level on
> > the MD. For this recording I set the meter half
> way
> > between the -12db mark and 0db.
> >
> > The setting on the output volume of the MD when
> > transferring the audio signal also seems to be
> quite
> > critical. Sony suggests setting it to max but this
> > always introduces distortion so I back it off to
> about
> > 50%.
>
> I take it you are using the headphone output. If you
> have a line output
> the volume setting would not matter. A line output
> is the more desirable.
>
> > I am unsure how to separate environmental and self
> > noise. A totally quiet environment is hard to
> find.
> > Possibly a flat plaine with no trees or grass on a
> day
> > with no wind.
>
> For self noise, you don't need to be outside. Stick
> the mic under a few
> pillows in as quiet a room as you have. Self noise
> is the signal the mic
> makes with no sound present. Set the settings the
> same as you recorded
> outside.
>
> To get the true value you would need to know the
> noise level of the
> outside environment you recorded. Which requires a
> sound meter. But you
> can get an idea how much of the recording was self
> noise without knowing
> the absolute value.
>
> Walt
>
>
>
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