No one-way approach to learning ir remote control frequencies

[dhouston]

Is there a software being able to filter out the high and low periods available ?

Yes and no. I have software I wrote a few years ago that can convert between .WAV, .CCF, .LIR and a few other IR formats as well as allow for graphic editing but it's not available to others. If you attach your .WAV file, I'll convert it to CCF or RAW (just the durations of pulses/spaces).

BTW, this looks more like a Sony 12-bit protocol than NEC but it's hard to say as the horizontal scale is too small. If it is Sony, it's explained here...

• http://www.sbprojects.com/knowledge/ir/sirc.htm