On 10/16/2015 06:27 PM, David McGriffy wrote:
I've been thinking about how this discussion might apply to a couple of
things I'm working on and it seems to me there are two different problems
here.
First, there is the issue of higher order mics often not really being
higher order at low frequencies.
Nor at high frequencies because of spatial aliasing...
But isn't this really a problem of
encoding and not decoding? It seems like we shouldn't have to know
anything about the mic once we are in B-format. And such considerations
would not apply to synthetically panned higher order signals, right?
Yes, that is the sad thing about B-format from spherical microphone
arrays. They are not truncatable, since the upper orders are
increasingly band-limited.
You have to balance the spectrum by equalizing the lower orders
accordingly, so that if you use for example the full fourth-order output
of the Eigenmike, you arrive at a reasonably flat energy spectrum.
But if your listener assumes she or he can truncate the signal set to
third or second order due to lack of speakers, they will lose more
treble than bass by doing this.
I wonder if it's possible to put some fake LF borrowed from the lower
orders into the higher ones, so that the spectrum is flat for each
order, with the understanding that the directional information will be
wrong... But I'm not sure I'm seeing all the implications of this...
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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