DSDPlus

[racingfan360]

>I don't know if you are willing and/or able, but if you can please consider recording the raw audio from
> any encrypted NX4800/NX9600/DMR transmissions

Ok for those that are interested here are some samples as requested: as you'll see, the mute function only works for the higher level of encryption seen on one sample of NXDN9600. All others unmute the (garbled) audio.

Personally, if the author of dsd+ is maybe thinking of adding a mute function for all encryption, please can we have that a switchable feature - I for one actually like to be able to tell my decodes are working fine and audibly tell which traffic has been encrypted. I can get other other samples if required....just PM me.

NX48_Trunked_Base_Control_Channel_Data_Only
Zippyshare.com - DSDPlus-Raw-Input_NX48_Trunked_Base_CC.wav

NX96_Mobile_High_Encryption (mutes DSD+)
Zippyshare.com - DSDPlus-Raw-Input_NX96_Mobile_High_Encryption.wav

NX48_Mobile_Basic_Encryption
Zippyshare.com - DSDPlus-Raw-Input_NX48_Mobile_Basic_Encryption.wav

NX48_Trunked_Mobile_Encrypted
Zippyshare.com - DSDPlus-Raw-Input_NX48_Trunked_Mobile_Encrypted.wav

DMR_Base_Capacity_Plus_Trunked_Encrypted
Zippyshare.com - DSDPlus-Raw-Input_DMR_Base_CapPlus_Trunked_Encrypted.wav

NX96_Mobile_Basic_Encryption
Zippyshare.com - DSDPlus-Raw-Input_NX96_Mobile_Basic_Encryption.wav

NX48_Trunked_Base_Encrypted
Zippyshare.com - DSDPlus-Raw-Input_NX48_Trunked_Base_Encrypted.wav

HTH,

Jim

 

[mtindor]

MotoTRBO Weak Signal Raw Audio

Here is a link to a raw audio sample of some fairly horrendous weak signal TRBO audio. Br0adband asked for a sample since he only has access to strong signal TRBO.

This sample consists of transmissions from multiple weak [and maybe a few strong] systems. And the input audio gain is too high too.

This particular sample can be tuned using dsdtune+DSDPlus to actually come up with better filtering parameters that significantly increase the decoded audio quality.

Zippyshare.com - MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

Before tuning:

dsdplus -fr < MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

After tuning:

dsdplus -fr -dr5 -dh1 -ds52 -dd48 -dv2 < MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

Add -v4 for more verbosity if you want, and -u9 to change up audio quality if you like.

Mike

 

[mtindor]

Before tuning:

dsdplus -fr < MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

After tuning:

dsdplus -fr -dr5 -dh1 -ds52 -dd48 -dv2 < MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

Add -v4 for more verbosity if you want, and -u9 to change up audio quality if you like.

Mike

Sorry, the first switch was supposed to be -fr, NOT -f1 as previously stated. Corrected.

M

 

[br0adband]

DAGNABBIT, was just posting about the -f1 vs -fr.

 

[mtindor]

Zippyshare.com - MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

If you want to run that through DSD with/without tuning parameters, great. But it would behoove anyone who is checking it out to actually listen to the raw audio first. Notice how weak the signals are and how horrendous the raw audio [being fed into DSDPlus] is.

M

 

[deboe]

After tuning:

dsdplus -fr -dr5 -dh1 -ds52 -dd48 -dv2 < MotoTRBO-weak-signals-from-multiple-sites-RAW.wav

Was the -dv a 2 or 20?

 

[mtindor]

Was the -dv a 2 or 20?

It was a 2, just as posted. But, apparently you asked that because you tested the raw input and got a value of 20 for -dv. So I must have miscopied things. I concur that -dv20 yields better results than -dv2. So it must have been -dv20

The big thing are the resultant numbers. By default you get a decode score of 39,483. With -dr5 -dh1 -ds52 -dd48 -dv20 added you get a decoding score of 61,309. It could likely be improved upon a little more with some painstaking doing multiple iterations, but the end result probably wouldn't be significant enough.

The raw audio was horrible. I doubt a professional radio would do significantly better. Nobody should be expecting to turn that radio audio I posted into 100% perfect decoded audio. It isn't going to happen with that funky audio. But it was great for showing an example of how the advanced tuning parameters can make a huge difference on weak signal TRBO.

I guess we should chalk it up as a lesson that the default filter values aren't best for TRBO.

Mike

 

[frazpo]

Concerning DSDTune -
For the purposes of obtaining an long enough voice sample has anyone used an audio app to piece together the wav samples to get 30-60 seconds. I used maybe a 20 second voice sample and yielded fairly good results. Just wondered if I had more it would be any better.

 

[n9mxq]

Can't say I'm impressed.. DSD 1.6 is out decoding DSD+ here hands down so far..

 

[frazpo]

Which protocol? Your the first not to see the opposite affect. On this thread at least.

 

[n9mxq]

Which protocol? Your the first not to see the opposite affect. On this thread at least.

P25.. don't have enough signal on the local DMR to get decent decode with either..

 

[tylerwatt12]

I just wish I could turn the output audio filter off. DSDplus feels too filtered, There isn't enough bass response.

 

[n9mxq]

I just wish I could turn the output audio filter off. DSDplus feels too filtered, There isn't enough bass response.

You can't fine tune that thru Windows mixer?

 

[slicerwizard]

And at least "Correct IQ" ought to be checkmarked.

I think that Correct IQ is more for correcting I/Q phase errors in sound card interfaces. DVB-T dongles don't seem to have any significant I/Q phase errors - at least not that I've seen.

 

[Boatanchor]

I just wish I could turn the output audio filter off. DSDplus feels too filtered, There isn't enough bass response.

I'm with you on that. DSDPlus decodes well after tuning, but the audio is crap compared to the "original' DSD. There must be some audio compression going on in DSDPlus too as DSD160 sounds a lot quieter (less background ambient noise on transmissions).

To me, it sounds like DSD160 has a more natural dynamic range than DSDPlus.

 

[moonbounce]

I use both DSD1.6 and DSD+ with a discriminator tap and I find that on VHF low only and decoding A25 DSD 1.6 is virtually useless. The signal is cleaner than DSD+ by about 25% but with DSD+ I hear the complete broadcast. The signal using DSD 1.6 on VHF low is too broken to be useful, and often just avoided using it for VHF low signals.
Same results using SDR Sharp and VB cable. So for me DSD+ is far superior than DSD 1.6. on VHF low. Above VHF low on my computer they are equal.

Moonbounce

 

[frazpo]

I just wish I could turn the output audio filter off. DSDplus feels too filtered, There isn't enough bass response.

Yes. I am decoding with an old dell 610 and while I get good decodes the audio is like a knife in my ear with these laptop speakers. I do need to try to mix the audio. I need another version I guess cause I am not seeing those options in my default sound properties.

 

[wx5uif]

Good job on this! I took my laptop and scanner over to my parents house yesterday and was able to receive NXDN trunked without any issues.

 

[groovy]

Has anybody looked into why NXDN trunked isn't received by regular DSD? Is it just a missing sync pattern, or are there significant protocol changes?

Reference: http://forums.radioreference.com/digital-voice-formats/231192-nxdn-idas-frame-sync-data-needed.html

 

[woodpecker]

I found the NXDN syncs and posted them in that thread a few months ago, are you finding those sync patterns are not working, I didn't release a new windows DSD with the sync patterns you need to compile them in yourself in linux, if there is enough interest I could release another version with them in.