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Audio for both CD and DVD?
Old 1 week ago
  #31
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Quote:
Originally Posted by dgpretzel View Post
If I am understanding you correctly, this is what I hear you to be asserting:

"If one records at sample rate 'A', and also records at a higher sample rate 'B', but decimates it back down to 'A', then the resulting derived product is superior to that originaly recorded at rate 'A'."

Is this an accurate summary of what you are saying?

Thank you.

DG
The term "decimate" is usually used when referring to what happens in an ADC. The ADC samples at 64 - 256x the base rate (so in the MHz range) using 4 - 6 bit and then decimates that sample stream down to 44.1/48/88.2/96/etc KHz at 16 or 24 bit.

One thing to keep in mind is that certain compromises are made in ADC design both in light of cost and in light of keeping latency low. When using an offline sample rate converter (SRC) as much processing as needed can be thrown at it and latency is not an issue so you can do "perfect" re-sampling.

Also, often the weak link in SRC of any form is the quality of the anti-aliasing or anti-imaging filters. There are many compromises that can be made. (For instance the the fillters can be made less steep which means less processing and latency but potentially a high frequency roll-of and/or aliasing).

The end result of this is that, depending on the converters used, recording at say 96Khz and then converting to 44.1 KHz with a high quality offline SRC can yield better results.

Alistair
Old 1 week ago
  #32
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Thread Starter
Quote:
Originally Posted by loujudson View Post
and resampling is not quite "decimating" if done properly with good software.
(and not at a lower rate). But, perhaps we are using the term differently.

DG
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