🚀 go-pugleaf

Over in rec.audio there has been talk of a new D/A topology using an analog
filter to extract information from a pulse width modulated waveform. The
PWM waveform is of course simply constructed from the digitized audio 
information. Since my only strong background is in circuit design, not in
DSP, I am not sure what inherent advantage this scheme would have over the
now used scheme of segmented D/A's. Further adding to the puzzlement is
that there has been no mention of this scheme (I might have interpreted
the exact workings of the scheme incorrectly) in the literature. If you look
at the December 1989 IEEE Journal of Solid State Circuits, page 1517, they
are still talking about the "classic" D/A architecture of ratioed current
sources or multiple identical current sources.

The latest post on this thread follows:

Article 15293 of rec.audio:
Path: van-bc!zaphod.mps.ohio-state.edu!usc!apple!agate!shelby!lindy!ucscb.UCSC.EDU!sorka
From: sorka@ucscb.UCSC.EDU (Alan Waterman)
Newsgroups: rec.audio
Subject: Re: New 1-bit CD Machines
Message-ID: <7180@lindy.Stanford.EDU>
Date: 14 Jan 90 06:47:58 GMT
References: <4616.25a5ac56@uwovax.uwo.ca> <18030058@hpfcdj.HP.COM>
Sender: news@lindy.Stanford.EDU (News Service)
Reply-To: sorka@ucscb.UCSC.EDU (Alan Waterman)
Organization: UCSC Undergrads
Lines: 4


From the articles I've read, it is indicated that the new 1bit cd
technology reaches the theoretical limits of sound reproduction
on the current CD format.