Article View: sci.electronics
Article #2861Good question about 1 bit A/D technology
From: Derek Taubert
Date: Tue, 14 Apr 1992 07:43
Date: Tue, 14 Apr 1992 07:43
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1456 bytes
Ok, I was thinking about this the other day, and some serious problems fell into my thoughts... The master clock pulse for the Pulse Width Modulation portion of one of the Carver CD players runs at 33MHz. If you consider that you are feeding a value to the initial stage of this converter every 1/44.1K seconds, then you would be left with 33M/44.1K different possible widths that a pulse could take on. 33,000,000 pulses/sec --------------------- = 748.29... pulses / sample 44.1 samples/sec WHOA! That's only 748 different pulse widths! How in the heck do you get that to convert into an analog value that can take on 65536 different voltage levels? Or, for that matter, how did you get a 16 bit value to shrink down into those 748 possible widths, that would then get translated to an analog signal that rivals direct A/D? I understand the concept of reducing error by converting pulse width to analog voltage levels, but not with these numbers! Or am I missing something here? Derek
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Path: arc1-ca.pugleaf.net!sparky!uunet!usc!wupost!csus.edu!ucdavis!slab.slip.uiuc.edu!derek From: derek@slab.slip.uiuc.edu (Derek Taubert) Newsgroups: sci.electronics Subject: Good question about 1 bit A/D technology Message-ID: <1992Apr14.074317.18517@slab.slip.uiuc.edu> Date: 14 Apr 92 07:43:17 GMT Sender: derek@slab.slip.uiuc.edu (Derek Taubert) Reply-To: dat33228@uxa.cso.uiuc.edu Organization: Damage Inc. Lines: 23