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- Path: sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!sdd.hp.com!ux1.cso.uiuc.edu!news.cso.uiuc.edu!dcl-nxt10!ctt31684
- From: ctt31684@dcl-nxt10 (Ching Te Tai)
- Subject: Re: My theory on GUS clicking
- References: <Jan25.220236.78922@yuma.ACNS.ColoState.EDU>
- Message-ID: <C1Iq41.Cpp@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: University of Illinois at Urbana
- Date: Wed, 27 Jan 1993 15:09:37 GMT
- Lines: 46
-
- knepley@CS.ColoState.EDU (Ranseus (Jim Knepley)) writes:
-
- >I felt like listening to my GUS on a better set of speakers than the walkman
- >speakers I normally use, so I've got in on a pair on Infinity RefEL's with
- >a Sony amp. Things are improved, a lot, holy cow, wow, much better.
-
- >Anyway...
-
- >With this setup, the notorious Gravis UltraClick (TM) made it's habbit of
- >clicking all too audible, but only on some things. Hmm, I thought, why not
- >all the time?
- >It clicked on .MOD files, .669 files, and in Star Control 2. It _DIDN'T_
- >click with Midi files or anything in SB emulation. Thus, my theory...
- >I'd be willing to bet that there are 2 calls that can be made to the
- >Ultrasound to have it produce sound (I'll call them PlayPatch and PlayDigi).
- >It seems that everything that uses PlayDigi (the .SND files, GUSMOD, etc)
- >will click. On the other hand, PlayPatch driven things (PLAYMIDI, SBOS)
- >won't (SBOS does use patches, type SBOS -debug if you don't believe me).
- >Anyone care to shed some light on this? If I'm right (I hope I am)
-
- From my digital signal processing class... The clicking you described
- sounds like the situation when you try to sample at a lower frequency
- than necessary. Usually the theory says that you're to sample at 2
- times the highest frequence in your input waveform (Nyquest (sp?)), but
- it is hard to determine your highest frequency (e.g. there're
- other sound sources in the room, like your monitor's high buzz, etc.)
- and even if you do, due to timing errors, you need to sample at a somewhat
- higher freq. than 2* the max. freq in input.
-
- >then it should be a fairly simple patch to eliminate clicking all together.
- >It's also possible that there's an attribute to the Gravis supplied patch
- >files that resist the clicking of other, less refined, patches.
-
- Here you are complaining about clicking and boy do I envy you. Ever since I
- sold my Sound Blaster card, I'm w/o a sound card at all! (But, I'm
- saving up money for the GUS... Can't wait 'til I get one!)
-
- >Josh, when do we get the Renaissance (SP?) GUS developer's kit? :)
-
- >All the best,
- > Jim
- >--
- >----- knepley@cs.colostate.edu ----------------------------------------------
- > Jim "Ranseus" Knepley | Avoid rectal-cranial inversion.
- > Programmer, magician, | "Gun's don't kill, it's those bullet things"
- > computer geek. |
-