At 15:27 20-04-13, Sampo Syreeni wrote:
If one regards the subcardioid as made up of omni and figure of
eight components, is it not the case that the ambisonic XYZ signals
of the Soundfield Mic are derived solely from the figure of eight components?
Not quite, because at high frequencies the mics aren't exactly
coincident, so that the following A-to-B matrix derives some of W
from the fig-8 (or velocity) components and some of XYZ from the
monopole contributions. But almost: XYZ are conceptually just three
fully coincident fig-8's, sensitive purely to velocity (and
derivable in this case from pressure gradient over time).
But... How close to the theoretical A format polar diagramy are the
XYZ components of the Soundfield (or Tetramic) microphone at
frequencies above those at which they are essentially coincident?
At 15:08 20-04-13, Eric Carmichel wrote:
>SNR wouldn't have been my initial concern because I have some wee-tiny
>electrets that have (purportedly) +10 dBA noise--pretty low for a small
>capsule.
Granted this is better than the mics that Blumlein could command, but
when it comes to the processing of the raw outputs, is not the
problem of lower level signals produced by subtraction still a real one?
David
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