1-bit D/A

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2 total messages Started by Michael Hui Tue, 16 Jan 1990 03:40

#573

Author: Michael Hui
Date: Tue, 16 Jan 1990 03:40

32 lines
1797 bytes

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.

Re: 1-bit D/A

#574

Author: Jim Belesiu
Date: Tue, 16 Jan 1990 15:25

6 lines
674 bytes

The greatest advantage that I see is that with a 1 bit D/A the implementation
can be realized with a digital IC at a lower cost than a digital-analog
IC.  I am not sure if one can claim that the analog filtering requirements 
are any less complicated for a one bit D/A as compared to a multi-bit D/A.

Jim

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