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2. Re: Choosing the right sampling rate and sample size

Subject: 2. Re: Choosing the right sampling rate and sample size
From: "Scott Fraser" scottbfraser
Date: Tue May 18, 2010 7:44 am ((PDT))
<<It's considered best practices (by me, at least) to record at the
sampling
rate (or a multiple thereof) used by the final medium. So if you're
ending
up on CD, record at 44.1 (or 88.2). If it's film, 48 (96 or 192).
You're more likely to get errors when converting between sampling
rates that
do not divide evenly.

<JL} Yes, IMO, that's to so some degree true, integer arithmetic is way
easier to do.>>

This is a common misconception. Current Sample Rate Conversion
technique does not directly divide higher rates to the target rate,
i.e. 88.2k to 44.1k is not a case of simply dividing by two. The
approach taken by any current professional-level software or hardware
worth utilizing is to upsample the original sample rate to a very high
rate (somewhere in the multi-mHz range, I forget now,) which is evenly
divisible by whole numbers into any of the target sample rates.
Whether the original is 88.1k or 96k, it will be upsampled first, then
divided by an integer to arrive at 44.1k or 48k. There's really no
inherent advantage to 88.1k over 96k as a result of this when
converting to CD release format.

Scott Fraser








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