- #Ambe codec software free how to#
- #Ambe codec software free pdf#
- #Ambe codec software free mod#
- #Ambe codec software free 64 bits#
- #Ambe codec software free code#
#Ambe codec software free code#
It has the code I ripped off (as referenced in the above link). What does a GMSK D-STAR stream actually look like? - My Ham stuff - clarified a lot of it into plain English for me. Here are the links I used to get this far. But, it seems that way, or there is some custom bit encoding/interleaving going on.Īnyway if someone wants to add the similar functionality themselves. I don't see why they would make a different AMBE 2400bps codec. Which is the one thing so far I don't think anyone can do anything with sadly. So, a simple XOR with 3 different values on a rolling effect is enough. The truth is it's reset on every 3 octets of data sent. The documentation suggests that the same scramble function is used and is initialized at the start of each data sync signal. The decoding of the data, now that's a weird one. But, I figured that'd be a fair bit of work for something that doesn't as yet decode any audio. I did consider scanning for the end marker. In this way, it keeps running while keyed and will only send a short amount of gobbledegook on keyoff. I then modified the DStar data side to pick up the data packet syncs and read the correct amount of voice/data combos between syncs then hand-off again. But, no way I was inventing those wheels for curiosity's sake! I also had the header code pass the very first voice packet into mbelib. But I did after some hours get it decoding the header information and even validating the checksum.
#Ambe codec software free how to#
What I did was capture the first one as a new packet type "DSTAR HD" decode the header (this took a lot of research, on how to decode it). This is what is currently used for sync.Ġ00100110101111 - On the final data frame (the final data frame is actually a double data, 48 bits in length). So, this is the market for the packet header.ġ1010001101000 - On the 1st data packet and then every 21st.
#Ambe codec software free 64 bits#
It's prefixed by a series 64 bits in the repeating pattern "10". There are three clear sync markers in a DSTAR, well QSO for want of a better word.ġ11011001010000 - At the very start of a transmission. In any case, not sure what the policy would be of publishing the changed code, since I did include code from other projects I found online, to decode FEC, perform interleaving and the bit scrambling routine.īut, I'll include some info for people interested in doing this. Also to keep feeding them in, and follow each resync (the current test code dumps 200 voice packets regardless of whether they were received, and then exits).īut, it comes down to one of a few possibilities.ġ: The mbelib just cannot decode DSTAR ambe.Ģ: The interleave is proprietary (it's not mentioned at all in the official documentation)ģ: There is some fancy bit rotation/inversion going on (could be covered by interleave, but - well it's not a normal tactic employed). As well as feed in the audio packets (including the first one, which is always missed in this setup). I managed to get this to actually decode the header, and slow data. You said back to square one? Comments are closed.I actually took a look at this. I suppose the discriminator problem is to be expected if there's not a direct output. Back to Square One.ħ3 Eric I can't thank you enough for going to this effort. I still need to feed it through the decoder and see if I can get good decodes. I tried my WinRadio G305e today as a test and the waveforms look a lot better. With the bad output I could not get a good decode of the sync bits and data clock recovery did not work well.
#Ambe codec software free mod#
There is a mod to tap directly off the Discriminator Output. There is some circuity in the AR5000 between the Discriminator Output and the Demod Output. It appears there is too much level shifting of the waveform for a clean P25 decode. 7 Download This version of FMPA adds support for the Airspy Mini. Free Codec Xp, free free codec xp freeware software.
#Ambe codec software free pdf#
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I managed to spend over a week finding out my AR5000 does not pass the P25 waveform cleanly.:mad: 9600 baud EDACS is no problem with the AR5000. Hello, I am still working on a P25 decoder.
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