DSD 1.3 and mbelib 1.2 released

[Forts]

It's a Thinkpad A31.... It's gotta be at least 5 or 6 years old I would guess.

 

[KD4YGG]

How is the project progressing for getting this ported to Windoze...

Not experience at all with running Linux.

 

[Forts]

Out of curiosity I grabbed Ubuntu 10.04 and threw it on a year old Dell Core2 Duo laptop. No change with TRBO decoding

 

[tripleplay905]

Hello,

There seems to be a problem using 64 bit Linux. The programs compile. I get no sound using the Provoice samples on a 64 bit Debian system and 64 bit Ubuntu system. Saving to a wav results in a audio file with silence. I do get sound when I play the Provoice samples with the program compiled on a 32 bit Debian system.

73 Eric

I too have this exact same problem in 64bit Ubuntu 10.04.

 

[dsdauthor]

I will put together a maintenance release that addresses these issues:

1. adding support for EDACS EA sync format
2. No sound under 64 bit linux (specifically Unbuntu)

Those that are having trouble decoding DMR/MOTOTRBO, if you can provide a .wav file in 48k/16bit/mono from your disc tap of the signal I will look at it. DSD currently only supports repeater output signals so if this is not a repeater output that might be the issue.

It is not likely that TETRA could be supported. Even with sufficient bandwidth and sound card sample rates the pi/4 DQPSK modulation is not compatible with an FM discriminator.

It is possible that four slot Opensky could be supported but I have no .wav samples at this time
to work with.

I don't see what use VSELP support would be as there can't be many ancient Astro systems in use?

 

[tripleplay905]

2. No sound under 64 bit linux (specifically Unbuntu)

Very much appreciated.

I don't see what use VSELP support would be as there can't be many ancient Astro systems in use?

Cleveland Ohio still uses VSELP voice.
Cleveland Trunking System, Cleveland, Ohio - Scanner Frequencies

Would it also be possible to allow dsd to only decode certain talkgroup ids?

 

[systron]

It is not likely that TETRA could be supported. Even with sufficient bandwidth and sound card sample rates the pi/4 DQPSK modulation is not compatible with an FM discriminator.

Whats about Tetrapol ? (GMSK,RPCELP)

I don't see what use VSELP support would be as there can't be many ancient Astro systems in use?

Some Systems use VSELP.
There is a linux VSELP codec, if its possible to modify this one ?
A easy way to expand the codecs in mbelib.

Speech Softwares by IKEDA Mikio

 

[Mike_G_D]

It is not likely that TETRA could be supported. Even with sufficient bandwidth and sound card sample rates the pi/4 DQPSK modulation is not compatible with an FM discriminator.

Man...that's interesting! That's my old "bread and butter" (PI/4DQPSK). I haven't really researched TETRA so I didn't know this. I am trying to clear out the cobwebs in my brain about quad demod's and their support circuitry and such lately and, boy, have I gotta a lotta cobwebs in there!! Heeeeelllllp please....! HINT HINT...trying to get some smart and currently active hardware folks knowledgeable in this area to head over to the hardware thread and start "gestaltinatin'" on this topic, as it were. But, one odd thing here - in the little I recall reading about TETRA I thought it was stated that the systems by default are all encrypted. Is this not so?

BTW - DongleDaahuuuuuuudde - EricCottrell...Welcome Back!!

-Mike

 

[st0ne]

hi,

i know the author of dsd or mbelib is anonymous. but maybe i can provide some information about d-star. so if the author is interested, we should mail or contact in another way ;-)

greetings st0ne

 

[Comint]

But, one odd thing here - in the little I recall reading about TETRA I thought it was stated that the systems by default are all encrypted. Is this not so?

I was also of the same opinion. However, I was recently berated for repeating that view, and was informed that on newer systems, it is optional.

Anyway, encrypted or not, and depending on the the level of encryption (ie complete end-to-end, or just the voice) it would be nice to be able to decode a control channel to confirm a TETRA system.

--
Comint

 

[KA1RBI]

I don't see what use VSELP support would be as there can't be many ancient Astro systems in use?

Please see this thread (specifically, the posts from May):

http://forums.radioreference.com/digital-voice-formats/175897-southernlinc-iden.html

I'll have to confess no clue as to exactly which flavor(s) of codec is in use within iDEN, but just thought that it would be nifty if someday another system could be added to the list of supported types...

73

Max

 

[Mike_G_D]

I'll have to confess no clue as to exactly which flavor(s) of codec is in use within iDEN, but just thought that it would be nifty if someday another system could be added to the list of supported types...

73

Max

Now I was a thunkitatin' 'bout this meself....iDEN being used by Nextel and Nextel being in the LMR band and NOT the cellular band negating the legality funkiness...n'such like...

 

[RadioDSPjunkie]

VSELP disc taps samples

Very much appreciated.



Cleveland Ohio still uses VSELP voice.
Cleveland Trunking System, Cleveland, Ohio - Scanner Frequencies

Would it also be possible to allow dsd to only decode certain talkgroup ids?

tripleplay905 or anyone else here have VSELP disc tap audio samples from this network or similar?
I used to worked on LPC vocoder algorithms awhile back, maybe I can examine it and share the results.
Also, if you have specs (whatever you can share) on the vocoder like bit-rate, frame size, sample rate, mode, interleaving, FEC, modulation (Ist it C4FM or 4FSK?), trunking architecture, etc. This data will will help.

Thanks!

Jose Miguel

 

[james32746]

I will put together a maintenance release that addresses these issues:

1. adding support for EDACS EA sync format
2. No sound under 64 bit linux (specifically Unbuntu)

Those that are having trouble decoding DMR/MOTOTRBO, if you can provide a .wav file in 48k/16bit/mono from your disc tap of the signal I will look at it. DSD currently only supports repeater output signals so if this is not a repeater output that might be the issue.

It is not likely that TETRA could be supported. Even with sufficient bandwidth and sound card sample rates the pi/4 DQPSK modulation is not compatible with an FM discriminator.

It is possible that four slot Opensky could be supported but I have no .wav samples at this time
to work with.

I don't see what use VSELP support would be as there can't be many ancient Astro systems in use?

I am having sound issues with the program running on a 32 bit Ubuntu system as on P25 Phase 1 systems I am only hearing popping noises and nothing else even though the signals are decoding on the screen.

 

[carbineone]

In NJ we have two VSELP users, Trenton PD on a Smartzone system and Atlantic Highlands PD on a Conventional channel.

 

[Mike_G_D]

tripleplay905 or anyone else here have VSELP disc tap audio samples from this network or similar?
I used to worked on LPC vocoder algorithms awhile back, maybe I can examine it and share the results.
Also, if you have specs (whatever you can share) on the vocoder like bit-rate, frame size, sample rate, mode, interleaving, FEC, modulation (Ist it C4FM or 4FSK?), trunking architecture, etc. This data will will help.

Thanks!

Jose Miguel

I was hoping a DSP guru or two or ten would show up!

Good stuff!!

-Mike

 

[Jay911]

I thought I once heard that iDEN has a layer of encryption built in, but I have no hard evidence to back up this fact.

 

[systron]

TETRA VOICE DECODING with Wavecom W-Code

(W-Code = soundcard based)

WAVECOM, the reference in data decoding

is working on TETRA (in the pipeline) and Apco Phase II Voice Decoding.

 

[WayneH]

I thought I once heard that iDEN has a layer of encryption built in, but I have no hard evidence to back up this fact.

Negative. I used to support an iDEN network and it was not a regular feature.

 

[stuck22]

What kind of time frame are you looking at for a windows release? I am excited to check it out.