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-
- The GUS Programmer's Digest Friday, 12 May 1995 Volume 19 : Number 005
-
- Today's Topics:
- Where'd SDK v2.22 go??
- Constant DC offset
- RE: Software v.4.11
- RE: Constant DC offset
-
- Standard Info:
- - Meta-info about the GUS can be found at the end of the Digest.
- - Before you ask a question, please READ THE FAQ.
-
- ----------------------------------------------------------------------
-
- From: Lance Kalzus <kqy5125@is.NYU.EDU>
- Date: Thu, 11 May 1995 11:25:02 -0400 (EDT)
- Subject: Where'd SDK v2.22 go??
-
- Does anyone read this list?/
- No ;) Does anyone know where the SDKs have all gone? I've checked both
- orst and epas, and the path which should contain the SDK files (among
- many other things) doesn't.
-
- "Suspicious-looking stranger flashes you a dangerous grin
- Shadows at your window -- Was it only trees in the wind?
-
- "Every breath a static charge -- A tongue that tastes like tin
- Steely-eyed outside -- To hide the enemy within..."
- -- Rush, The Enemy Within
-
-
- ------------------------------
-
- From: Ricky.Houghton@cs.cmu.edu
- Date: Thu, 11 May 1995 16:18:44 -0400 (EDT)
- Subject: Constant DC offset
-
- Apparently it is a problem with the 4231. The Anlog devices chipsets,
- 1848 and 1849 had the same problem. I switch to the GUS-MAX card
- because I was told that the 4231 did not have this problem. This is very
- disappointing as we are trying to do simulatenous play/record via the
- codec and do frequency analysis as quickly as possible. Filtering the
- data as well really sucks. And to complicate matters, we really want to
- stereo record on a simultaneous played sound.
-
- Ricky.Houghton@cs.cmu.edu
-
-
-
-
- ------------------------------
-
- From: Chris James <JAMESC@mail.medoto.unimelb.edu.au>
- Date: Fri, 12 May 1995 11:35:00 -0700 (PDT)
- Subject: RE: Software v.4.11
-
- Just a note about installing v4.11. Most people seem to be under the
- impression that its just window's drivers. I'm fairly sure that it installed
- MAXSBOS too (over the original). Also, I've noticed the occasional burp
- with my GUS max (only on stereo files) in Windows (just like the old days).
- I don't remember this being the case with the previous version 3.59.
- Anyone else noticed this. BTW I've a GUS MAX.
-
- Chris
-
- P.S. I just have to say that the install programs that Gravis are using
- now are tops (If a little ugly, i.e. sim-windows). I had a nightmare
- installing a Pro 3D this morning, Media Vision could learn a thing ot two...
- (BTW I don't use a 3D at home of
- course!)
-
- ------------------------------
-
- From: Chris James <JAMESC@mail.medoto.unimelb.edu.au>
- Date: Fri, 12 May 1995 12:00:00 -0700 (PDT)
- Subject: RE: Constant DC offset
-
- >Apparently it is a problem with the 4231. The Anlog devices chipsets,
- >1848 and 1849 had the same problem. I switch to the GUS-MAX card
- >because I was told that the 4231 did not have this problem. This is very
- >disappointing as we are trying to do simulatenous play/record via the
- >codec and do frequency analysis as quickly as possible. Filtering the
- >data as well really sucks. And to complicate matters, we really want to
- >stereo record on a simultaneous played sound.
-
- I'm now not sure that the DC is entirely internal (although its hard to
- figure
- how it couldn't be since its post recording multiplexer). I recorded some
- signals from the GF1 playing midi in windows, no offset! This doesn't make
- sense!
- Presumably all the inputs are decoupled properly to the CS codec (this is
- how it
- seems when no post multiplexer record gain is applied at least on my
- system), i.e.
- no offset. Do you always have a noticeable offset?
-
- I vaguely remember at some time noticing an offset drift. That is the signal
- would
- work down to null offset so I saw a smooth "decay". This was when I was
- writing
- a driver using the SDK. Its possible that it is "autocalibrating" but that
- the SDK
- (were the windows drivers built with this?) code doesn't wait for long
- enough
- (the specs mention 160 ms). I still think the final solution is to enable
- the codec's
- built in digital HP filters which are design to deal with this problem. If
- ULTRINIT
- and the SDK code etc don't explicitly poke this register maybe we can write
- a quick init program to enable this function? Maybe we should talk to
- Crystal Semi?
- I'll try doing a Web search for an email contact (phone calls to US are
- expensive from here).
-
- Chris James
-
-
-
-
-
-
-
- ------------------------------
-
- End of The GUS Programmer's Digest V19 #5
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