| Title: | Welcome to the CD Notes Conference |
| Notice: | Welcome to COOKIE |
| Moderator: | COOKIE::ROLLOW |
| Created: | Mon Feb 17 1986 |
| Last Modified: | Fri Mar 03 1989 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1517 |
| Total number of notes: | 13349 |
Can somebody give me a fairly lucid explanation on how 2X or 4X oversampling rates on CD players can improve fidelity? I can understand how an increase in the sampling rate during A/D conversion can allow you to more closely approximate the infinite number of points on the analog wave. My brain-cramp stems from the fact (fantasy?) that there is a finite amount of data to be read on the disc. Aren't you just reading the same data 2 or 4 times before it changes? And if so, how does the rate effect the sound? Seems to me as long as ALL the data gets read CORRECTLY, continued/extended reading won't make it any better. What am I missing here? Thanks for the help... Edd
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 244.1 | GRAMPS::WCLARK | Fri Jan 03 1986 14:08 | 9 | ||
Oversampling simply pushes the fundamental produced by sampling further away from the 'audio band'. This allows it to be filtered by more gently sloped filters. Many believe (myself included) that steep sided filters are contributors to sound deterioration, even though they may be intended for elimination of non audio stuff. Walt | |||||
| 244.2 | TBD::ZAHAREE | Fri Jan 03 1986 16:22 | 5 | ||
I believe if you re-read .0, the question boils down to; "Aren't you just taking the same 4 (or 2) numbers (samples) and pushing them in to the D/A?" To which the answer is, "No." See note 31.0 - M | |||||
| 244.3 | MENTOR::COTE | Fri Jan 03 1986 17:01 | 5 | ||
RE: .1 That was the nut-shell type answer I was looking for. I knew I had
to be missing something somewhere.
RE: .2 Thanks for the pointer. (Where was it when I did the "SEARCH OVERSAM"
command?) Certainly fills in the holes.z
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| 244.4 | TBD::ZAHAREE | Fri Jan 03 1986 17:08 | 3 | ||
Perhaps the term "oversampling" is in itself misleading. - M | |||||