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- Path: sparky!uunet!gumby!yale!not-for-mail
- From: copley-devon@cs.yale.edu (Devon Copley)
- Newsgroups: comp.sys.ibm.pc.soundcard
- Subject: Re: Computer Shopper Review...bad news for SBPro
- Date: 24 Jan 1993 17:31:54 -0500
- Organization: Yale University Computer Science Dept., New Haven, CT 06520-2158
- Lines: 29
- Message-ID: <1jv5cqINNqt@CHAMELEON.ZOO2.CS.YALE.EDU>
- References: <1993Jan22.183105.26913@magnus.acs.ohio-state.edu> <d2henan.727733146@dtek.chalmers.se>
- NNTP-Posting-Host: chameleon.zoo2.cs.yale.edu
-
- In article <d2henan.727733146@dtek.chalmers.se> d2henan@dtek.chalmers.se (Andreas Henning) writes:
- >ebraeden@magnus.acs.ohio-state.edu (Eric W Braeden) writes:
- >>If this is true, it sure is a joke to think you can record at a
- >>44.1 KHz sampling rate...Why bother? 11 KHz would be far more than
- >>enough if you can only get 2.6 KHz into the board.
- >
- >I'm not an propeller-head-electronic-wiz-kid, but I don't think
- >those figures are accurate. If the board filters all frequencies
- >over 2.6 kHz, it would limit the effective sampling rate to
- >1.3 kHz, according to Nystroms theorem.
-
- Sorry to do this to you, Andreas, but you've really got it all wrong.
- First of all, it's the NYQUIST theorem, and it states that the in order
- to capture any given AUDIO frequency, you must use a SAMPLING frequency
- that is twice the given audio frequency. What (supposedly) is happening
- in the SBPro is that, due to some sort of inadequacies in the circuitry,
- its frequency response rolls off at 2.6 kHz. You can sample at however
- high a frequency you want, but you WON'T reach the theoretical frequency
- responce of your sampling rate -- even at 44.1 kHz SAMPLING frequency,
- you won't be able to produce AUDIO at more than 2.6kHz. Needless to say,
- if this is true, it's a really crippling defect in the design.
-
- Devon
-
- --
- _______________________________________________________________________________
- Devon M. Copley Yale University
- copley-devon@cs.yale.edu Theatre Studies, Computer Science and Psychology
- COPDEVM@YALEVM.BITNET "No matter where you go, there you are."
-