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Article #497Re: 1 bit D to A ?
From: Dean Swan
Date: Thu, 09 Nov 1989 22:23
Date: Thu, 09 Nov 1989 22:23
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From article <8911091355.AA20559@en.ecn.purdue.edu>, by zawada@EN.ECN.PURDUE.EDU (Paul J Zawada): > all that much.. Anyone else have any ideas? I don't know what they are in fact doing, but here are some thoughts on the matter. First, If they in fact do anything close to what you are suggesting , they are probably just using the comparator output of a kind of backwards binary search DAC. I highly doubt it though. What seems more reasonable is that they are using pulse width modulation of a very high frequency carrier, and low pass filtering the output. A good practical example of this technique can be found in the General Instruments SP0256 speach synthesizer chip. The amplitude of the output signal is directly proportional to the pulse width of the carrier. -Dean Swan dean@sun.soe.clarkson.edu
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!image.soe.clarkson.edu!dean From: dean@image.soe.clarkson.edu (Dean Swan) Newsgroups: comp.dsp Subject: Re: 1 bit D to A ? Message-ID: <1989Nov9.222327.5488@sun.soe.clarkson.edu> Date: 9 Nov 89 22:23:27 GMT References: <8911091355.AA20559@en.ecn.purdue.edu> Sender: dean@sun.soe.clarkson.edu (Dean Swan) Organization: Clarkson University, Potsdam, NY Lines: 17