[HN Gopher] Digital Signals
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       Digital Signals
        
       Author : olalonde
       Score  : 65 points
       Date   : 2023-01-11 09:59 UTC (2 days ago)
        
 (HTM) web link (www.sigidwiki.com)
 (TXT) w3m dump (www.sigidwiki.com)
        
       | greggsy wrote:
       | Related, there's an awesome tool [1] created for the SDR crowd
       | for decoding captures of 433mhz signals, which really deserves an
       | award for open source design and is a genuine public service.
       | I've used this to identify and reverse engineer generic
       | thermometers, which saved me a heap of dough paying for name-
       | brand gear.
       | 
       | [1] https://triq.org/
        
       | IIAOPSW wrote:
       | My favorite track has to be Russian enigma.
        
       | TrackerFF wrote:
       | For those looking at the waterfall images: Y-axis is time, X-axis
       | is the frequency axis, colors are intensity. Jus a spectrogram
       | that's been rotated 90 degrees to the left.
       | 
       | When you play the sound, the start is at the bottom of the image,
       | and then moves upwards (kind of like Guitar Hero). Some of them
       | can be quite musical, like the THOR
       | (https://www.sigidwiki.com/wiki/THOR)
        
         | ScottEvtuch wrote:
         | That sounds backwards to me. Don't you mean Y axis is time and
         | X axis is frequency? Otherwise how could it play from bottom to
         | top?
        
         | kkoncevicius wrote:
         | > When you play the sound, the start is at the bottom of the
         | image, and then moves upwards (kind of like Guitar Hero)
         | 
         | In this case Y-axis is time, no?
        
       | rahen wrote:
       | Listening to those samples, I initially thought this was a new
       | album from Autechre.
        
       | nforgerit wrote:
       | Love it. Now I just need to find some cereals that put whistles
       | in their boxes.
        
       | int3rlop3r wrote:
       | Play all of them together! (:
        
       | unwind wrote:
       | Meta: I think "RF" or "wireless" in the title would be warranted,
       | this seems to be very much focused on radio communications.
       | Obviously there's a lot of digital signalling going on in wires
       | as well, so the distinction has merit in my opinion.
       | 
       | Also, it's a really impressively long list! Cool.
       | 
       | Edit: clarified first sentence.
        
         | [deleted]
        
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       (page generated 2023-01-13 23:02 UTC)