On 2011-01-18, Geoffrey Barton wrote:
How do you justify that assertion?
The complex condition number of the UHJ encode/decode matrices tells at least half of the story. It's not swell, but not abysmal either.
Phase shifts changing with frequency also translate into amplitude errors when the phase shifter chains are summed.
A given, of course.
You need to maintain the asymptotic behaviour outside the band too.
Asymptotic to what, precisely?
These things are audible on critical material and, especially in an encoder, should therefore be as accurate as possible. Not having to use analogue now makes this easily possible with a good design, and at reasonable mips cost. Why accept less?
True enough. But then following analogue, IIR design principles can buy you significantly fewer processing cycles, which can then be utilized to better effect elsewhere. E.g. within your psychoacoustical model -- the thing that really cut the hard requirements even with POA, enabling it to sound good enough at mere four channels.
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