Re: realtime dsp with soundcards

Article View: comp.dsp

Article #1293

#1293

From: Brian Willoughby
Date: Wed, 30 Sep 1992 21:45

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Nicolas Alejandro Arauz writes
| Maybe someone can answer this question for me:
| > I had been thinking about trying to write an effects program like you
| > did in your archive, only using the SoundBlaster card, or the PAS-16 or
| > the new Gravis card.  It seems as if you obviously know something about
| > this, so I'll ask you.  My question that I wasn't sure about was whether
| > or not ANY of these cards would all simultaneous input/output from the
| > ADC/DAC do do digital effects?  Or perhaps even switch so fast that you
| > wouldn't notice a lag.  Have you done any work with the commercial
| > soundcards?  I haven't gotten your archive yet but I will take a look at
| > it now.  It seems like you're possibly using high-sample rate DACs/ADCs
| > from reading your message.  Thanks f or your help!

While working on the MultiMedia Extensions to Windows 3.0 and Windows 3.1 at  
Microsoft, I worked closely with the SoundBlaster card (but not the other two  
that you mentioned).  The Creative Labs hardware cannot support simultaneous  
digital I/O for various reasons, one of which is that they only allocate one  
DMA channel in the PC for transferring the data.  Even at 8-bits mono, the PC  
has trouble with one direction, and cannot support A/D and D/A with th  
SoundBlaster.  This is true for SoundBlaster card versions 1.5, 2.0 2.5 and  
3.0.

Perhaps someone else has experience with the PAS-16 or Gravis card.
-- 
Brian Willoughby	Software Design Engineer, BSEE NCSU
BrianW@SoundS.WA.com	Sound Signal Processing Software and Consulting
NeXTmail welcome	- NO EMAIL SOLICITATION without prior permission

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Newsgroups: comp.dsp,comp.sys.ibm.pc.soundcard
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!destroyer!cs.ubc.ca!uw-beaver!uw-coco!nwnexus!sounds!brianw
From: BrianW@SoundS.WA.com (Brian Willoughby)
Subject: Re: realtime dsp with soundcards
Message-ID: <BvEv3t.2yF@sounds.wa.com>
Sender: brianw@sounds.wa.com (Brian Willoughby)
Reply-To: BrianW@SoundS.WA.com
Organization: SoundSoftware, Bellevue, WA, USA
References: <kelsOEu00WB60qwHUH@andrew.cmu.edu>
Date: Wed, 30 Sep 1992 21:45:28 GMT
Lines: 27

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