Digital Voice Decoding with RTL SDR (RTL2832), DSD and SDR Sharp

1. 

   Superphish says:

   October 14, 2014 at 9:33 AM

   Hi, The software is literally called “Virtual Audio Cable” (google for
   their download page). There’s also a free one that should work that I
   recently found called “VB-Cable”.

   Reply
2. 

   Станислав Лукьяненко says:

   October 14, 2014 at 8:35 AM

   Most likely, my signal is not a digital voice, because it’s dynamical
   characteristics is not like for voice: signal is continious, there are some
   periodical ‘peaks’ in about 10 sec, but there are no other fluctuations.

   Reply
3. 

   spellground says:

   October 14, 2014 at 7:41 AM

   forgive my ignorance but can I listen to encrypted digital with this set
   up

   Reply
4. 

   Superphish says:

   October 14, 2014 at 7:18 AM

   Hi, for VAC is didn’t change anything, just default settings. For DSD I
   used the -xr flag as my received signal is an inverted MOTOTRBO signals. In
   SDR# I used NFM, and I found that a low filter order or 10 worked best and
   that filtered audio seemed to help a little. You’ll need to fiddle with the
   volume sliders and find a range that works well for yourself since all
   sound cards are different.

   Reply
5. 

   linutas says:

   October 14, 2014 at 6:40 AM

   look at that traffic

   Reply
6. 

   Pete4000uk says:

   October 14, 2014 at 5:45 AM

   WHat kind of VAC software are you using? thanks !

   Reply
7. 

   CompterCrazy says:

   October 14, 2014 at 4:51 AM

   Does this computer have a multi-core processor?

   Reply
8. 

   Станислав Лукьяненко says:

   October 14, 2014 at 4:45 AM

   I tried to decode channel that is most likely digital voice with DSD, but
   no decoding happens. Using virtual audio cable and other settings as in
   your video (filter order to a value of 10, use filtered audio and set dsd
   to high CPU priority). What can be wrong? Video sample of my signal
   available at my channel.

   Reply
9. 

   Superphish says:

   October 14, 2014 at 4:09 AM

   I just tried running DSD on the sound from your video but got nothing. So
   either the video sound quality was not good enough, it’s not digital voice,
   or it is but it is a format not recognised by DSD.

   Reply
10. 

    wf2v says:

    October 14, 2014 at 3:30 AM

    Nice. Where is this from? London?

    Reply
11. 

    Superphish says:

    October 14, 2014 at 3:12 AM

    It’s a 4 core Intel i5. I don’t think SDR# or dsd do multicore processing
    though.

    Reply
12. 

    bruce buffalo says:

    October 14, 2014 at 2:37 AM

    what are your exact vac setting and dsd commands. and sdrsharp settings
    your are using?

    Reply
13. 

    Andromeda Strain says:

    October 14, 2014 at 1:44 AM

    I used VB-cable with RTL but my old computer works better with a
    discriminator feed from an old Uniden scanner. That way only one program,
    DSD, is running.

    Reply
14. 

    Norbury53 says:

    October 14, 2014 at 1:19 AM

    LOL It’s about as far from London as it’s physically possible to get and be
    on dry land – bloody Yanks (shakes head) 🙂 Mind you, it’s entirely
    possible that there is a London in NZ so maybe I speak too soon… 😉

    Reply
15. 

    Superphish says:

    October 14, 2014 at 12:33 AM

    Hi, sadly you cannot listen to encrypted digital with this, only
    unencrypted. I don’t believe it is possible to decode encrypted currently,
    and probably won’t possible be for the foreseeable future.

    Reply
16. 

    twc01 says:

    October 14, 2014 at 12:15 AM

    good work how you got everything all set up. Must give it a go myself!
    It’ll be a challenge for me lol

    Reply
17. 

    Superphish says:

    October 14, 2014 at 12:13 AM

    Thanks. This is in New Zealand.

    Reply
18. 

    bahathir says:

    October 14, 2014 at 12:02 AM

    Nice demo. 🙂 I also did the DSD, but using GNU/Linux in command line
    youtu.be /qPWD4imXXsc Yeah, a little bit complicated, but, it works 🙂
    Thank you.

    Reply
19. 

    Superphish says:

    October 13, 2014 at 11:45 PM

    Do you get any sort of text scrolling from DSD on this signal without extra
    command line settings? If you do but the sound is garbled, it’s probably
    digital voice but DSD detected the wrong setting. Type dsd -h into the cmd
    line to see more settings. If theres no text scrolling then it’s probably
    not digital voice, or DSD is not receiving audio properly. Make sure SDR#
    is outputting to virtual audio cable. Also, I had to set virtual audio
    cable to my default audio recorder for DSD to find it.

    Reply
20. 

    Tim Mattison says:

    October 13, 2014 at 11:42 PM

    Digital voice decoding demo using SDR#. This is exactly what I imagine a
    lot of people are going to be doing right away. Time to sell my old
    scanner! 

    Reply
21. 

    Thomas Dorr says:

    October 13, 2014 at 11:28 PM

    Digital voice decoding demo using SDR#. This is exactly what I imagine a
    lot of people are going to be doing right away. Time to sell my old
    scanner! 

    Reply
22. 

    Johnny D says:

    October 13, 2014 at 11:01 PM

    can you help me when i start dsd+ it just shows me what sound cards and
    stuff that I have it does not scroll showing data but on the very top it
    shows some kind of number lvl +6% s/s += and some numbers 

    Reply
23. 

    hemi john says:

    October 13, 2014 at 10:20 PM

    still can not get it 2 work dont no how 2 use command prompt

    Reply
24. 

    hemi john says:

    October 13, 2014 at 9:48 PM

    how do u get in to the command line

    Reply
25. 

    Happy Turtle says:

    October 13, 2014 at 9:03 PM

    this call was like near you or how far ?

    Reply

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