🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: sci.electronics
Article #2861

Good question about 1 bit A/D technology

#2861
From: Derek Taubert
Date: Tue, 14 Apr 1992 07:43
23 lines
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
Technical Details
Message-ID: <1992Apr14.074317.18517@slab.slip.uiuc.edu>
Path: arc1-ca.pugleaf.net!sparky!uunet!usc!wupost!csus.edu!ucdavis!slab.slip.uiuc.edu!derek

Show Full Headers
Complete Article Headers
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