On 2012-01-25, Paul Hodges wrote:
And given that HJ was defined to include within its tolerance zones both H and 45J, they could by definition have simply continued using existing H equipment and labelling the results HJ.
Yes. And that is one of the funkiest things about ambisonic compatibility codings: you can't say there is just one codec. No, there are encoders and decoders, separately. Because analog electronics compatibility not only allows, but sometimes requires that sort of thing.
I believe we should implicitly talk about precise encoders, here. Because there is precisely one optimum way to decode what they produce, evenwhile, say, UHJ allows a rather broad decoding band over the Scheiber sphere.
(Mind you, it was perhaps the first system in existence to explicitly define itself through a decoder, and a one which wasn't perfectly well defined either. Nowadays every digital codec defines itself that way, if usually in a way which doesn't tolerate errors... ;)
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