On 2012-01-25, Eero Aro wrote:
I know the BBC did broadcast some of the Proms in either H or HJ,
it's a real shame there's nobody I could contact at the BBC who might
have more info. It's another thing that needs archiving, or it'll be
lost forever
It's a pity taht the Ambisonic Discography is down.
I've said it before (in-between one of my long rants), but I'll say it
again: most likely most matrix encodings, whether active or passive,
could be recognized blindly with the proper digital signal processing.
I've never tried it, but there is plenty of theory to support it, and in
more than one way.
For example, if you can ever lock onto a single source which gives out
even a single, sustained harmonic which slides slowly enough in
frequency, it is possible to calculate the local form of the transfer
function from the source to the recording from there. Or if you ever
know some source is impulsive enough, it's possible to use it as a
bootstrap for multichannel deconvolution, where reverb is an aid to
detection, instead of a hindrance. And so on.
I've never done it, but it's eminently doable. I wouldn't be surprised
if it was doable, with whole pieces, to the level of identifying
individual encoding circuits, or at least their faults, instead of just
encoding standards. I mean, we have a *stupendous* amount of prior
knowledge available about what music seems like when viewed through
mathematical-statistical indicators, whereby seeing which kind of a
system they went through before landing in our hands as an encoded
version ought to be a rather straight forward (if modelling and
computation intensive) problem.
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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