On 20/09/2011 01:53, Sampo Syreeni wrote:
OTOH, the shuffler algorithm is exactly the one used to extract the Ambisonic X,Y,Z signals by
mics using omni capsules on a rigid spere.
This is something totally new to me. Rigid sphere? Originally it was about an open 1D sphere
(thus, "line segment", so how did it mutate into a rigid sphere in between, in the process?
Yep, it is perfectly possible to extract spherical harmonic responses from omnis on a rigid sphere,
but it does need some serious equalisation - according to some simulations Eric Benjamin has done
for me, this may require as much as 40 dB boost in the bass. This is for omnis on a 50mm sphere. For
first order mics, you'd probably want to use a 25mm sphere to move the HF wobbles up an octave and
just accept LF rolloff on the dipoles. As Eric says, though, this isn't much different from what
happens with phono cartridge amplifiers. In fact, one _might_ even say that all that is happening is
that the implicit eq in electro-mechanical design of ribbon mics is just being done explicitly in
the computational domain.
Dave
--
These are my own views and may or may not be shared by my employer
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