DSDCC

[moonbounce]

Came across this open source rewrite from the original DSD if anyone is interested.

https://github.com/f4exb/dsdcc

 

[sameehosen]

Hello
I am a novice on the Cali Linux system and I do not have enough skill to build the program
Please help with the building instructions
Thank

 

[sameehosen]

Good evening
I've already followed the instructions on this page and have successfully built dsd and mbilib and it works fine
Http://www.george-smart.co.uk/scrapbook/digital_speech_decoder/
When I wanted to build DSDCC I did not succeed so
Please Help

 

[kb9mwr]

This might help:
http://www.qsl.net/kb9mwr/projects/dv/pi-rtl-dsd-experiments.pdf

dsdcc uses the stock mbelib (if you don't have a hardware dongle) and it would be great if someone would optimize mbelib to be more resource efficient.

 

[sameehosen]

thank you my friend
Today it is installed on the kali linux system

 

[sameehosen]

Well friends
i have successfully built the program
aftar connecting SerialDV 3000 and rtl sdr and startup get this error:
Dsdccx
DSDDstar :: reset_header_strings
DSDDecoder :: resetFrameSync: symbol 0 (0)
Digital Speech Decoder DSDcc
Can not open for input. Sharing
Please Help

 

[F4EXB]

Hello,

can you please post the command line.

Best regards,
Edouard, F4EXB.

 

[dsp_student]

Dear Edouard

Have you ever tried to decode this DMR sample from "https://www.sigidwiki.com/wiki/FileMR.zip" ?
I used different SOX options but the program was not able to find good sync, I demodulated the signal by using SDR# and then I passed it to program by using SOX but I could not success to get output. therefore I changed some section of your code and I added PortAudio library to the code. I read samples from sound card that it receives data from another PC by connecting Line in cable.
On the first attempt, I played the original wav file on second PC and run the program on first PC, the program could not find any sync.
On the second attempt, I used SDR# to demodulate original file, the program was able to find sync good and some time it was able to generate some sounds but it was not clear.
In your code, there is PLL implementation and I think it is possible to decode the mentioned wav file without using any program such as SDR#, gqrx, CubicSDR,... am I right ?
Please check this problem and guide me.
Best regards.

 

[F4EXB]

DSDcc binary works with the discriminator digitized output so you need some software for FM demodulation. You can also try SDRangel https://github.com/f4exb/sdrangel that has DSDcc built in (DSD demod plugin).

 

[dsp_student]

Dear Edouard

You read everyone questions and reply them very quickly. It is so great work. Thank you so much.
You said that this project is based on dsd. In dsd for DMR decoding, It does not need to use Phase Lock Loop (PLL) while you use it in your project. I tested your code on mentioned DMR signal without using PLL section and it is able to decode dmr voice but there are "no sync found" intervals among the voice frames. could you please tell me your PLL section and relation between DMR decoding ?