Fons Adriaensen wrote:
On Fri, Dec 04, 2015 at 08:46:00PM +0100, Bo-Erik Sandholm wrote:
It should be workable to create a figure 8 mic signal by taking the
differential signal from 2 omni mics, the optimal operation frequency range
for this ofcource depends on the distance between the microphones.
the central omni mic can possibly be replaced by the sum of all the
mirophones?
This could work up to the frequency for which the distance between
the mics would be 1/3 of the wavelenght or so. Given the OZO's size
that will be way too low.
And for lower frequencies such a differential mic requires a gain
rising by 6 dB for each octave down. A S/N ratio of 64 dB means
30 dB SPL self-noise, so these mics (most probably MEMS) will be
very noisy even without taking such processing gain into account.
I don't believe a S/N ratio of 64dB will imply "30 dB self-noise caused
by crappy MEMS capsules", at least not here. I guess the noise is
introduced because of interference between the capsules, which means
sound from any direction will reach always more than 2/3/4 capsules. A
problem of the configuration itself, not of capsule quality.
Anyway: This microphone is probably very able to record "location
sound", whereas the direct sound (and say voices) can be mixed into this
"background" at a later stage.
(A pretty normal procedure in the area of film sound, by the way?)
Compared to a SF mike: the global dynamics and sensitivity could be
worse, but the spatial resolution could be better?
Best,
Stefan
P.S.:
The OZO is meant for professional use, and with these audio specs
it is clear that for such use the audio will in almost all cases
be recorded by other (higher quality) means.
No! I believe it makes utmost sense to record location sound < from the
VR camera perspective >. This is very probably not the final mix yet,
but at least an element you can use to obtain results.
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