On 2013-05-27, Augustine Leudar wrote:
That would be fine - there seems to be considerable debate amongst engineers as to whether higher sampling rates than 48k are worth using anyway
In that debate, I'd take a look at the Acoustical Reneissance for Audio position paper, aimed at influencing the rates and bitdepths of DVD-A, at the time. (http://www.meridian.co.uk/ara/araconta.htm) The limits it sets out says 48k is mostly enough, 56k is most certainly okay for anything and everything, so that of the commonly used rates at least 88.2kHz minimally covers it all with a large margin. It also makes it clear that 24 bits at that rate would be much more than necessary. Many fewer bits suffice, and if you think about the final distribution format, where you can apply in-band noise shaping willy-nilly, as few as 12 bits might just suffice.
That paper then came from a bunch of pretty believable people. Not only ambisonically knowledgeable people, but folks recognized by e.g. the AES as being knowledgeable about PCM tech; it ain't under Meridian's site for no reason... So, do take a look at their analysis every time you choose PCM rates and depths, and if you doubt the analysis, read through their references and all of the papers within the audio literature which have since referred them. I mean, I for one consider their rationale pretty much the best that is out there, and few have seriously disagreed with the total body of work around theirs, even to date.
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