Re: irrecord can't recognize Studer Revox B201/B205

On 12/30/17 15:05, Daniel Lemper wrote:
> Hi there,
> 
> I’m trying to get lirc to learn a Studer Revox B201/B205 from the 80s.
> 
> As far as I know, that remote doesn’t act like the usual remotes, but I don’t know what I have to do to get it working.

First of all, can you use Lirc for "normal"  signals, like RC5, NEC1, 
Sony? If you cannot send/receive "simple" signals, it is pretty 
pointless to tackle "weird" signals.

Secondly, irrecord is really not a very good program for capturing and 
recognizing IR signals. If you have a supported hardware (/dev/lirc- 
devices are such), try to use IrScrutinizer instead. (Caveat: it is my 
puppy :-)).

Having said that, there ir or has been Revox devices that uses/used IR 
signals _without modulation_. (Recall: most IR signals are modulated 
with a frequency between 36 and 40 kHz, but there are also some others.) 
A "normal" demodulating IR receiver (like TSOP-*) cannot receive such a 
signal. Unfortunately, I cannot suggest anything "off the shelf" to 
capture non-modulated IR signals. Possibly you can find the signals 
somewhere on the internet (see 
http://www.harctoolbox.org/IR-resources.html)?
Or you can build this thing: 
http://www.harctoolbox.org/arduino_nano.html and configure the firmware 
to use the non-demodulating receiver as a modulating receiver? I can 
give you more instructions if required.

The ability to send non-modulated IR signals, including handling 
"FREQUENCY 0" (in lircd.conf) correctly, was added to Lirc by myself one 
or two years ago, but most drivers still do not support it.


Greetz,

Bengt

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