On 10/07/2011 11:02, Fons Adriaensen wrote:
On Sun, Jul 10, 2011 at 10:10:49AM +0100, dw wrote:
Any microphone capable of separating two sound sources MUST be large in
terms of wavelengths (similar to the diffraction limit for telescopes)
The soundfield microphone cannot separate two or more sound sources at
_any_ frequency for this reason.
First this is not true, second it is irrelevant. You don't need to
'separate' sources (i.e. procude signals that each contain one source)
in order to reproduce them.
You snipped the context.
"i don't think that's possible. imagine two similar instruments, one at
0° and the other at 180°. once recorded in mono, they will be fused
together irrevocably. you won't be able to separate them with the help
of any vector metadata."
What is not true? I thought the whole point of higher orders was higher
resolution so that you could make less efficient use of your speakers..
This does not seem to worry the 'fanboys'.
Indeed it does not.
The problem with higher order mics at LF is of a different nature:
they require very high gains on difference signals if the mic is
small compared to wavelength.
OTOH, high order at low F is not essential for reproduction.
You can produce 3rd order AMB with the Eigenmike. But the
problem is that the frequency range gets limited at both
ends as order goes up. A normal AMB decoder expects full
range signals at all orders, so it will produce a poor
result. It is possible to create a decoder adapted to the
available frequency ranges, i.e. one that changes order in
function of frequency and would be full high order only for
medium frequencies. Problem with this is that there is no
standard way - the decoder depends on the mic.
Ciao,
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