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From: lanmaint@nssdca.gsfc.nasa.gov (Dave Yoest)
Newsgroups: comp.sys.apple2
Subject: Re: What's wrong with this Pascal program?
Keywords: pascal
Message-ID: <5410@dftsrv.gsfc.nasa.gov>
Date: 24 May 91 10:59:36 GMT
References: <5397@cernvax.cern.ch>
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In article <5397@cernvax.cern.ch>, myb@cernvax.cern.ch (michel bornand) writes...
>Hi everybody! Here is a simple Pascal program for Apple IIGS which should
>produce a sound at 16kHz. It does not work. What's wrong with it?
>What did I miss?
> 
>Thank you for all suggestions.
> 
>Micky

Your code may (or may not be) fine since I've never programed an 
Apple, but I suspect that you probably can't hear a 16KHZ tone
anyway. The frequency response of the human ear rolls off above
10-14 KHZ, so you may need LOTS of volume to detect an audio
signal at frequencies above 15KHZ and even then it may not be 
detectable. Do you have access to an oscilliscope, if so then
connect a probe to the audio output and see if you are generating
the signal electrically. It's also possible that IF you can hear
a 16KHZ tone, that the speaker you're using won't reproduce a tone
at that frequency. (DO dogs respond in any way when you test your
program?)  8)

Dave Yoest
LAN M&O section supervisor
NASA/Goddard Space Flight Center
Greenbelt, Md. USA

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