DSD 1.3 and mbelib 1.2 released

[robsterw]

And EDACS AEGIS? (I won't ask again I promise.)

 

[Jay911]

I'm not sure those are AMBE/IMBE codecs.. to the best of my knowledge, this program only supports those.

Think I recorded some good, long TRBO samples from two separate systems/sources, as well as a few seconds of P25 CAI from my good old Smartzone standby. Will pipe it thru my Linux box when I get home in about a half hour.

 

[dsdauthor]

I have updated the Wiki page with download links for mbelib-1.2.1. It has some audio quality improvements and should sound less "muffled" in native (non-upsampled) mode. Upsampling still sucks of course

 

[SCPD]

I have updated the Wiki page with download links for mbelib-1.2.1. It has some audio quality improvements and should sound less "muffled" in native (non-upsampled) mode.

Thank you so much!

Upsampling still sucks of course

Smooth(er) upsampling:

short pair[2]; // original 8k sps adjacent sample pair
short hex[6]; // 48k sps upsampled

// linear extrapolate
hex[0] = pair[0];
hex[1] = (pair[0]*5 + 1*pair[1]) / 6;
hex[2] = (pair[0]*4 + 2*pair[1]) / 6;
hex[3] = (pair[0]*3 + 3*pair[1]) / 6;
hex[4] = (pair[0]*2 + 4*pair[1]) / 6;
hex[5] = (pair[0]*1 + 5*pair[1]) / 6;

 

[DaveNF2G]

ProVoice is digital voice. Aegis is encryption.

 

[pyteen]

ProVoice is digital voice. Aegis is encryption.

Aegis is digital voice too.

First was VOICE GUARD, than AEGIS and now ProVoice.

Aegis Vocoder use Adaptive Multiband Encoder (AME)
• 8 Frequency Bands from 0 to 2900Hz
• Bit allocation is proportional to the energy at the instant of
the sample

 

[primehifi]

I've sent dsdauthor a pm with an aegis sample in it.

*fingers crossed*

 

[robsterw]

PyTeen is correct. AEGIS is the digital communication predecessor to ProVoice on EDACS.
AEGIS by itself IS NOT encryption. Just like ProVoice by itself is not encryption.
See NASA hams for info: AEGIS and Voice Guard Operation -- Ericsson M-RK I Radio
It's possible to run the radio in 3 different modes.
Clear (Analog W/PL tone), Digital (AEGIS Unencrypted), or Private (AEGIS Encrypted).
It's Private mode you'd be concerned about, but note that Private Mode is not automatically forced for digital comms.
I'm just saying'...

 

[AciDFluX]

Has anyone tried the BCD996XT with the new DSD 1.3? How well does it work?

 

[nosenadamenso]

DSD to do VSELP decoding?

Is it possible in future releases to include VSELP decoding ?

I think it's VERY possible for DSD. However, the old VSELP works as time-domain Linear Predictive Coding (LPC) vocoder instead of frequency-domain like xMBE. Not sure if that's going to work immediately, but still hopeful. (It may even probably sound better! LOL)

@carbinone What trunking or conventional system are you trying to decode? Saber radios.. or something else?


-- NMD

 

[MattSR]

probably no different to any other radio with a discriminator tap...

 

[DaveNF2G]

My bad. Aegis was advertised by some of the GE shops as "scrambled" digital voice. I should know better than to rely on marketing hype for technical info.

 

[mhzscan]

I was able to hear the sample files of the provoice, sounds pretty good. Can this be used with my bcd396XT or bct15x C_CH output? I do have a pro-43 with a data slicer/discrimator tap. I've looked in the forums and couldnt find any info on this. Thanks

 

[RadioDSPjunkie]

GREAT JOB!! Thank you DSDAuthor for your wonderful contribuition!

I think I would start porting this to Windows when I have time this weekend.
An architecture for plug-in for vocoders maybe a good idea for future vocoder integration.
Maybe, I wonder if we can use this for the GNU radio project also? GNU Radio - WikiStart - gnuradio.org

I will see what I can do.

-- Jose Miguel

 

[mtindor]

Can this be used with my bcd396XT or bct15x C_CH output? I do have a pro-43 with a data slicer/discrimator tap. I've looked in the forums and couldnt find any info on this. Thanks

No it cannot. It requires a discriminator tap. Only decode control channel data is sent over the C_CH output. And with this program you are decoding the digital audio on the voice channels, not the control channels. So, with this program suite and a discriiminator tap, you can decode audio that otherwise would not be able to be decoded on your scanner (ProVoice, TRBO, etc.).

Mike

 

[wireless_friendly]

dsdauthor

Thanks for your job!

Please think about adding AEGIS Digital Voice. A lot of people dreams about AEGIS stronger than about ProVoice/TRBO/NXDN & etc..

 

[mhzscan]

Thanks Mike, so then could this work with my Pro-43 which is setup for etrunker and has both the discriminator tap and data slicer? I usually connect it using a rs-232 cable. My understanding from the limited information out there regarding DSD is that it receives the data using a MIC input and not a serial port? is this correct?

 

[primehifi]

Thanks Mike, so then could this work with my Pro-43 which is setup for etrunker and has both the discriminator tap and data slicer? I usually connect it using a rs-232 cable. My understanding from the limited information out there regarding DSD is that it receives the data using a MIC input and not a serial port? is this correct?

You're better off using the line-in input on your computer. Mic tends to mess with the 1's and 0's too much where as line in is much more raw feed.

Some people in the original thread for this software mentioned they'd had success with the mic input, but if you have line in, just use that.

 

[mhzscan]

im using a laptop, so im stuck with the MIC input. If I have issues with it, i'll use a spare optiplex that has a line input.

 

[offsite]

Using xoscope under Ubuntu

Btw, this app uses oss instead of alsa... so to actually get it to run under Ubuntu 10.04 et. al., you have to install an alsa app that allows xoscope to use alsa.

sudo apt-get install alsa-oss

Then

aoss xoscope -D Soundcard

Works here at least...

-rb-

For Ubuntu / Debian users ...

"xoscope" is a simple oscilloscope program to give you a visual indication of the waveform as seen by your computer.

To install ...

sudo apt-get install xoscope

After installation is complete, try ...

xoscope -D Soundcard

You should see something like the screen shot below ...