When the speed of sound is faster, shouldn't the spacing be greater?
Peter Shute
Sent from my iPhone
On 14 Feb 2015, at 12:01 pm, <>
[naturerecordists]
<<>>
wrote:
> I also tried mounting the Schallers on a tongue depressor to get a better
> stereo image -needs more experimentation to get the spacing right.
Keith,
Just as a bit of theory, spaced stereo working on time differences will
depend on the speed of sound in whatever medium you are recording. For
instance the speed of sound in water is about 4.4 times the speed in air so
you would expect the same time differences with mics spaced about 40 mm
apart instead of 170mm for average ears.
I've no idea of the speed of sound in damp earth, so there is an experiment
for a start, like measuring the time difference from a thump with the mics a
metre apart..
As for the woodpecker the speed of sound in wood is around 10 times the
speed in air, which suggests s very close spacing might be worth trying.
See:
http://www.engineeringtoolbox.com/sound-speed-solids-d_713.html
David Brinicombe
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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