Subject:
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Re: Firmware: IR transmission demystified
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 10 Nov 1998 00:31:57 GMT
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Original-From:
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Markus L. Noga <markus.noga@SPAMCAKEinrialpes.fr>
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Viewed:
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3022 times
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I just checked http://cesdis.gsfc.nasa.gov/linux/misc/irda-details.html
> The physical link layer is based on the common asynchronous serial
> port, with a few adaptions. The serial port is set to "8N1", i.e. one start
> bit, eight data bits, no parity, and one stop bit. The infrared transmitter
> is off during the idle/"space"/1 state and -- in a deviation from wired
> serial signaling -- on only 3/16 of the active/"mark"/0 bit period. This
> reduced "on" period drops the power needed to transmit and moves the
> emitted spectrum toward a higher frequency where it is easier to
> separate from other IR sources.
If our baby can recognize those 3/16 marks as marks, and the other end
won't mind our transmitting 16/16 marks, perhaps.
http://cesdis.gsfc.nasa.gov/linux/misc/irda.html
> IrDA physical layer specifies an IR LED with a peak output in range
> from 0.85 um to 0.90 um. Many common IR devices are optically
> suitable; a few advertised specifically as IrDA compatible are:
Also, IrdA goes up to from 2400 bps to 115 kbps in Version 1.0. We can
do 4800 bps max.
--
Markus L. Noga noga@inrialpes.fr
INRIA Rhône-Alpes http://www.inrialpes.fr/
IPR Universität Karlsruhe http://wwwipr.ira.uka.de/
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