🚀 go-pugleaf

On <Feb 09 03:51> Greg Harp writes:

 GH> This looks like a good time to jump in with a question I thought of this 
 GH> morning.  I came up with the (probably not very original) idea of 
 GH> "digitizing" remote control codes with my computer and playing it back
 GH> via software control.  

That's what we do in our remote.  

 GH> Then not only could I add timing features to my audio/video 
 GH> equipment, but I wouldn't have a pile of remotes to deal with.  (No, I 
 GH> don't like those universal remotes.)

What don't you like about them?  


 GH> Basically, my idea was to make 1-bit samples of the phototransistor's 
 GH> state at up to, say, 50K/sec (I don't know how fast I could push this yet). 
 
You'd lose the carrier information since 50k is well below Nyquist.

 GH> I guess I should ask for some info on the transmission technique.  Is the
 GH> signal just a set of bits that are transmitted one per forty-thousandth of
 GH> a second, or is another signal modulated at 40kHz, or what? 

Most remotes modulate a carrier of about 40kHz onto the IR and then turn the 
whole thing on and off at a much slower rate.  Others, mostly older equipment 
and cable boxes, use no carrier and just send fast single pulses.


 
 




--  
Rick Ellis
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