🚀 go-pugleaf

JRS:  In article <e8p76s83r7nnddnc78b1a1o4dmpjhi14d6@4ax.com> of Fri, 24
Dec 1999 16:27:19 in news:comp.lang.pascal.borland, Jud McCranie
<jud.mccranie@mindspring.com> wrote:
>"Syphon" <Syphon@chill-zone.fsnet.co.uk> wrote:
>
>>Anybody know how to produce two different frequencies out of the PC speaker
>>or through a sound blaster card in pascal. 
>
>Two different frequencies at the same time?  I don't think that
>is possible on the PC speaker, but it can be done on the sound
>card.  I don't know the details though.

I had a program to produce "speech" out of the speaker, so it must be
possible.  I expect that one disconnects (by software) the speaker from
the usual counter, and mark:space modulates its drive to synthesise the
required waveform.  Originator should check what accuracy is *really*
needed, and whether his speaker is adequate (one can easily connect a
better, usually).
 
-- 
� John Stockton, Surrey, UK.  jrs@merlyn.demon.co.uk   Turnpike v4.00   MIME. �
 <URL: http://www.merlyn.demon.co.uk/> TP/BP/Delphi/&c., FAQqy topics & links;
 <URL: ftp://garbo.uwasa.fi/pc/link/tsfaqp.zip> Timo Salmi's Turbo Pascal FAQ;
 <URL: http://www.merlyn.demon.co.uk/clpb-faq.txt> Pedt Scragg: c.l.p.b. mFAQ.