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Article #318 (419 is last):
From: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
Newsgroups: freenet.sci.comp.atari.questions,freenet.sci.comp.atari.spec.8bit
Subject: Re: DELETING SOUND HARMONICS
Posted-By: xx004 (aa700 - Michael Current)
Edited-By: xx004 (aa700 - Michael Current)
Date: Mon Dec 14 19:53:55 1992


 
 
 as195@cleveland.Freenet.Edu (Joseph Pallendino) writes:
 
>My XE SYSTEM (65k bytes-game machine) has an audio output jack &
>I can put out 800 hertz but it's a square wave.  I'd like to
>filter everything above 800 hertz including very much higher like
>50 kilo hertz or higher which is also coming from the audio jack.
>Any suggestions?
 
 
        Trying to turn an 800 Hz square wave into an 800 Hz sine wave
is not that easy. It is really a brute force that is required. You
would need some VERY high Q filers (probable active to do it well,
but passive might work). What do you need 800Hz for ? I think you can
make something VERY close to 800 Hz sine on the Atari 8 bit. Once Octive
above a 440 will give you 880Hz. If you could tell me what you are doing
this for. You could try 400 Hz into a freq. doubler or 1.6 Khz into an
Octave divider, but I would need to know what application this is for.
 
 
-- 
A. TRENT PHILLIPS |" A mirror is a negative space with a frame and a place for
  also known as   | your face, it reveals what the rest of us see. It conceals
   WHITE  ROOK    | what you'd like you to be."--Blue Oyster Cult
-------bb099@cleveland.freenet.edu-----aa1439@freenet.lorain.oberlin.edu-------


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