From: Adam Trent Phillips (bb099@cleveland.Freenet.Edu)
Date: 12/14/92-07:53:55 PM Z

From: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
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

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