Remote control on infrared rays. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / infrared technology
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This is additional information for DCD plugins, slydiman.narod.ru/scr/plugins/dcd.htm and sndRemote, slydiman.narod.ru/scr/plugins/sndremote.htm.
Three types of modulation
Bi-phase coding
The length of the pulses and the intervals between them are 0.9ms or 1.8ms.
Logic 0 and 1 are defined as shown in the figure:
Pulse-distance modulation
The pulse length is constant.
Intervals of greater duration - log. 1, smaller - log. 0.
Encoding standards
RC-5
Modulation Biphase. The high bits come first, then the low bits.
If you press the button on the remote control and hold, parcels will be sent (DataWord)
with the same Toggle bit value. If you release the button and press again,
the same messages will go, but with the inverse value of Toggle bit.
This standard uses PHILIPS и SAMSUNG without any deviation.
NEC
Modulation Pulse-distance. Low bits go first, then high bits.
When you press the button on the remote control, one full package is issued,
and then single pulses go through the gaps, indicating that
that the button is still pressed. Before sending (first full and single pulses)
there is one long synchronization pulse.
In the package, the address and the command go twice - first simply, then with inversion
(something did not match - the command was not accepted). In addition, the main package goes
only once at the push of a button. The likelihood that it will pass
right the first time, not very high.
data word:
Example: address 00110111" and command 00011010"
encoded as 00110111'11001000'00011010'11100101".
This standard is used HITACHI, NOKIA, AIWA, AKAI, AverMedia.
Creative RM-900 (by SoundBlaster Live Platinum) repeats the first message 2 times,
in addition, the first byte of the address is C1h, and the second 44h, that is, between the first and
the second byte has nothing in common. For compatibility, the first 2 bytes of the address are not
both are compared and used.
RECS 80 / RC-4
Modulation Pulse-distance. The high bits come first, then the low bits.
Nothing is 100% up to this standard. For example, in distance
JVC used this standard with strong deviations (differences in
durations, Toggle bits never change, address bits 6,
and command 8 instead of 4 and 6, respectively).
Used JVC.
SONY/Panasonic
Modulation Pulse length. Low bits go first, then high bits.
At the beginning of the package there is a long start pulse. Up to 20 bits of data.
In the DCD plugins, slydiman.narod.ru/scr/plugins/dcd.htm and sndRemote, slydiman.narod.ru/scr/plugins/sndremote.htm, when decoding the signal, a 28-bit identifier of the form 0FAAAACC is obtained, where F is a flag that determines the modulation , A - address, C - command.
The exception is SONY, where the least significant 24 bits simply determine the command code.
Publication: slydiman.narod.ru
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