[sdiy] Terminology Question

[phillip m gallo]

Even now that CD's are old it's still a portion of the technique called
"oversampling".  But importantly the pre-filter Data Rate is 4X the intended
delivery rate so the filter does not impact intended resolution.  The idea
was to allow small order anti-aliasing analog output filters.

A good reference on this and other signal processing concepts can be found
at (watch the line wrap):

http://www.analog.com/Analog_Root/static/technology/dsp/training/materials/d
sp_book_index.html

regards,
p

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of TIm Daugard
Sent: Tuesday, March 01, 2005 12:09 PM
To: music.maker at gte.net; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Terminology Question


From: "Scott Gravenhorst" <music.maker at gte.net>

> When an analog to digital converter is used to acquire, say 4 samples, and
> the samples are summed and then divided by 4, what is the term that
> describes this technique (to reduce noise and provide a more accurate
sample)
?

Back when CD players were new, I think they called this "4X oversampling."

Tim

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