Subj : Play audio from a serial port
To   : Bob Worm
From : AKAcastor
Date : Wed May 08 2024 15:42:24

 > Play audio from a serial port!!!

 BW> That's some top flight bodgery - I love it. I will have 
 BW> to try setting that up for myself. 100 bonus points for 
 BW> a tenuous Look Mum No Computer connection, as well.

It really is a fun hack, isn't it?  

 BW> I wonder what the low pass works out as? Surely if the 
 BW> start bit is 0 and the stop bit is 1 you're going to 
 BW> end up with a constant 11.5kHz whine?

The low pass filter would probably be filtering out the start bit if it is the only 0 bit?  A single bit at 115.2 kbps would be filtered out at 57.6 kHz (it's a pulse lasting 8.68 microseconds, that would be half the cycle), I think - though I really don't have much knowledge of analog electronics.

 BW> Heha, look at me worrying about audio quality... this 
 BW> thing's going to sound like balls and that's completely OK.

I'm actually surprised to have not seen this kind of trick in use before.  Seems like it could have fit in during the 80s when any (cheap) audio more than a beep was highly desirable.


Chris/akacastor
 

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 * Origin: Another Millennium - Canada - another.tel (21:1/162)

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