Re: [Freetel-codec2] Digital voice using an Android mobile phone

2016-06-04 Thread Adrian Musceac
l does the PTT work, e.g. can you use it > for real QSOs? > > Cheers, > > David > > On 04/06/16 18:13, Adrian Musceac wrote: > > Hi all, > > I was thinking the other day, that it would be nice to pair a cheap > > Android smartphone with a standard analog FM hand

Re: [Freetel-codec2] Digital voice using an Android mobile phone

2016-06-05 Thread Adrian Musceac
on Github, but the rest is not pushed yet due to time constraints. Cheers, Adrian On Sunday 05 June 2016 15:59:11 Jeroen Vreeken wrote: > Hi Adrian, > > Sounds great! > > On 06/04/2016 10:43 AM, Adrian Musceac wrote: > > So what is stopping us from doing that? Not very

[Freetel-codec2] Digital voice using an Android mobile phone

2016-06-04 Thread Adrian Musceac
Hi all, I was thinking the other day, that it would be nice to pair a cheap Android smartphone with a standard analog FM handheld radio (maybe a Baofeng) and upgrade your aging FM transceiver to a state of the art digital radio with Bluetooth, GPS, the ability to bridge voice through a VoIP

Re: [Freetel-codec2] new FreeDV 2400A VHF Modem

2016-03-18 Thread Adrian Musceac
Hi David, Is it possible to get our hands on the Gnuradio code? I've been trying to optimize modems running at 1200 bits/second and the best I could do was 100% copy at 8 dB above analog FM for DBPSK and 12 dB above for GMSK. Your modem seems to be 16-20 dB better than that! If I could see the

Re: [Freetel-codec2] new FreeDV 2400A VHF Modem

2016-03-19 Thread Adrian Musceac
smack on above the noise floor. If I were to run your modem, it would probably decode even where my SDR falls over. This is probably because the RTL-SDR has a much lower noise figure than my USRP, although I will trade that any day for the 12 bit ADC. 73, Adrian On 3/16/16, Adrian Musceac <ka

Re: [Freetel-codec2] new FreeDV 2400A VHF Modem

2016-03-19 Thread Adrian Musceac
k_mod, and fsk_demod. We are also > running our FSK modem directly from SDR samples instead of through FM > radios. We will be running 2400B over legacy FM radios, but don't yet have > the same degree of test coverage. > > Thanks, > > Brady O'Brien > > On Wed, Mar 16, 2016 at

Re: [Freetel-codec2] new FreeDV 2400A VHF Modem

2016-03-19 Thread Adrian Musceac
you could first test your FM modem, see if you can get the C/No >input versus SNR out curve. > >Looking forward, FreeDV 2400A is competitive with SSB for weak signal >work today, and I think we can push down another 10dB over time. > >Cheers, > >David > >

Re: [Freetel-codec2] 4FSK modem performance

2016-03-07 Thread Adrian Musceac
>> > performance from FSK modems.  They go through crappy PAs.  The >>> > receivers >>> > don't need a linear signal path or AGC. For the VHF FreeDV modem and >>> > SM2000 I've settled on non-coherent 4FSK at 1200 symbols (2400 bits) >>> > per >&g

[Freetel-codec2] Legacy modems

2016-03-08 Thread Adrian Musceac
Hi all, Motivated by David's work with VHF modems, I have started to investigate various Tx-Rx chains that might work with legacy narrow FM radios. My goal is to develop a completely portable system composed of a development board running open-source software paired with an FM transceiver. The

Re: [Freetel-codec2] Playing with Manchester (and other line codes)

2016-03-31 Thread Adrian Musceac
Hi Ross, While a spreadsheet is easier to work with, I find that Gnuradio is more flexible often. Out of many modes I have tried, I found that the most simple and robust for a 300 - 3000 Hz bandwidth is a 2kbit/s GMSK waveform. There are other modes which offer better performance, however I

Re: [Freetel-codec2] new FreeDV 2400A VHF Modem

2016-07-05 Thread Adrian Musceac
if the bit rate Rb and Noise BW N are > >equal. Eb/No is convenient as everything is normalised. > >Cheers, > >David > >On 05/07/16 08:16, Adrian Musceac wrote: >> Hi, >> >> Some more news from the VHF modem front. First of all, I did some >> performance

Re: [Freetel-codec2] new FreeDV 2400A VHF Modem

2016-07-09 Thread Adrian Musceac
d in the next frame >to >either skip or re-process a few samples. This is done in lines 233 to >242 >of fmfsk.c. > >Thanks, > >Brady O'Brien > >On Thu, Jul 7, 2016 at 4:50 AM, Adrian Musceac <kanto...@gmail.com> >wrote: > >> Hi Brady, >> &

Re: [Freetel-codec2] Necessary files.

2016-09-07 Thread Adrian Musceac
Hi Bruce, This kind of thinking is the reason open source projects are not taken seriously and are seen as little more than toys. I am guilty myself of being lazy, fortunately there are people who don't apply the same reasoning. I do get frustrated when I try to get people into open source and

[Freetel-codec2] Comparison between digital voice and analog narrowband FM on weak signals with interference

2017-09-15 Thread Adrian Musceac
Hi, I present a three way comparison between narrow band FM (5 kHz), QPSK Codec2 1300 (2.4 kHz) and QPSK Opus 19 kbit/s (16 kHz): https://www.youtube.com/watch?v=vApRe6R1gnk The comparison is taking place in the ISM band of 433 MHz with interference present from some temperature sensors in an

Re: [Freetel-codec2] Comparison between digital voice and analog narrowband FM on weak signals with interference

2017-09-18 Thread Adrian Musceac
K, now try the analog versus the digital, with a copy of the TX signal > at 30uS delay and -10dB with respect to the wanted signal (a common > multipath ) , and also 30uS delay and 0dB. > > Let me know... > > > On 15/09/2017 9:10 PM, Adrian Musceac wrote: >> Hi, >&

Re: [Freetel-codec2] Comparison between digital voice and analog narrowband FM on weak signals with interference

2017-09-18 Thread Adrian Musceac
nterference can only > succeed using appropriate SDR hardware. These USB sticks are not developed > for narrow bandwidths due to very low SFDR, phase noise of LO etc. > > 73, Helmut > > -Ursprüngliche Nachricht- > Von: Adrian Musceac [mailto:kanto...@gmail.com] > Ges

Re: [Freetel-codec2] Comparison between digital voice and analog narrowband FM on weak signals with interference

2017-09-18 Thread Adrian Musceac
Hi Glen, On 9/18/17, glen english wrote: > > It would not improve the performance in a low local multipath dominant > two tap local delay scenario like rural/farmland. > I would be very curious about the dB levels vs. frequency. From my knowledge, above 400 MHz is highly

Re: [Freetel-codec2] Why the DMR 4FSK modem is less optimal than David Rowe's 4FSK modem

2017-09-13 Thread Adrian Musceac
Hi Glen, We don't need to use the same chain for digital demodulation, since we are not software constrained. Using Gnuradio, we can simply reuse a flowgraph and connect/disconnect blocks on a click of a button to switch from one mode to another. What I don't want to do, is write a custom

Re: [Freetel-codec2] Comparison between digital voice and analog narrowband FM on weak signals with interference

2017-09-19 Thread Adrian Musceac
Hi, Thank you everyone, very valuable advice in this thread! I will not ignore it. Helmut, the USRP B20x variants are my main target, so be sure I'll be testing with them, it's just not a priority now. Let me explain why the RTL-SDR: lots of folks have this cheap dongle, and it's a very good

Re: [Freetel-codec2] 2400A VHF modem performance

2017-10-05 Thread Adrian Musceac
On 10/5/17, Steve wrote: > You might also do your testing in a more remote spot. The use of ISM > in the city is probably pretty high, and interference would be an > issue. It might not break the squelch (spread spectrum, etc), but the > bits would be corrupted. > > I see

Re: [Freetel-codec2] 2400A VHF modem performance

2017-10-05 Thread Adrian Musceac
Hi David, Thanks for the answer! I have just simulated a 2FSK modem on AWGN channel, but this time without using FM demodulation. It performs just like you said, ~2 dB worse than QPSK (at 5% frames dropped). This means that the FM demodulator I used for 2400A must be introducing some symbol

[Freetel-codec2] 2400A VHF modem performance

2017-10-04 Thread Adrian Musceac
Hi, I was able to perform some field measurements on Sunday to compare the performance of the 4FSK modem and the QPSK modem in the 433 MHz ISM band. My transmitter was set to 1 mW output power into a 2 dBi gain antenna located at approx. 21 meters above ground on one of the buildings in my city.

Re: [Freetel-codec2] 2400A VHF modem performance

2017-10-05 Thread Adrian Musceac
> Convolutional codes are a bit old hat - we're getting gd results on HF > with short-ish LDPC codes. > > But best to sort out your uncoded demodulator performance first. > > Cheers, > > David > > On 05/10/17 20:05, Adrian Musceac wrote: >> Hi David, >&g

Re: [Freetel-codec2] 2400A VHF modem performance

2017-10-05 Thread Adrian Musceac
mind. > > - David > > > On 06/10/17 10:32, Adrian Musceac wrote: >> Hi David, >> >> Thanks very much for the tips! Would you suggest that the matched >> filter approach is better for 4FSK as well? I am using it for 2FSK and >> it works well, it's just th

Re: [Freetel-codec2] why 4, and fsk, psk

2017-10-06 Thread Adrian Musceac
On 10/6/17, glen english wrote: > Considering we are not bandwidth constrained, why is everyone so > enamoured with 4 level waveforms like 4FSK , When two level/ two state > waveforms like BPSK and 2FSK are far more robust in a mobile environment > > Hi Glen, I'll

Re: [Freetel-codec2] Why the DMR 4FSK modem is less optimal than David Rowe's 4FSK modem

2017-09-13 Thread Adrian Musceac
On 9/12/17, David Rowe wrote: > > Have you performed any BER tests to conform the BER versus Eb/No > performance of the DMR waveform over ideal FSK? > > Cheers, > > David > Hi David, No I haven't done any BER tests yet. The code for BER is partly in place, but the 4FSK

Re: [Freetel-codec2] [Discuss-gnuradio] Why the DMR 4FSK modem is less optimal than David Rowe's 4FSK modem

2017-09-13 Thread Adrian Musceac
On 9/12/17, Phil Frost wrote: > I did some experimentation with this technique on BPSK31, and I was able to > get a little more performance in simulations with a matched filter and > trellis decoding than fldigi and PSKCore got with their unmatched filters > designed to

[Freetel-codec2] Why the DMR 4FSK modem is less optimal than David Rowe's 4FSK modem

2017-09-12 Thread Adrian Musceac
Hi, In this post: http://www.rowetel.com/?p=4650 David was asking the question why the 4FSK modem used by the DMR standard seemed to be performing so poorly, especially as compared to his ideal 4FSK modem. I was curious myself, so I implemented both and analysed them using my modified version of

Re: [Freetel-codec2] [Discuss-gnuradio] Why the DMR 4FSK modem is less optimal than David Rowe's 4FSK modem

2017-09-12 Thread Adrian Musceac
so there less than 1 dB of a gain to be had. Perhaps with DMR > there's more potential? > > On Tue, Sep 12, 2017 at 6:50 AM Adrian Musceac <kanto...@gmail.com> wrote: > >> Hi, >> >> In this post: http://www.rowetel.com/?p=4650 David was asking the >> questio

Re: [Freetel-codec2] Codec2 repeater

2017-12-04 Thread Adrian Musceac
syou understand them between OFDMA and > OFDM > > Are you sure ... ? > > Glen :-) > > > On 5/12/2017 7:36 AM, Adrian Musceac wrote: >> OFDMA (not OFDM) > > > > -- > Che

[Freetel-codec2] Codec2 repeater

2017-12-04 Thread Adrian Musceac
Hello, Yesterday I commited support for same-mode Codec2 repeater (digital to digital). Apart from voice frames, now station identifiers and text messages also get digipeated. For now the Codec2 audio gets decoded if forwarded over the VoIP connection and re-encoded at the other end for RF

Re: [Freetel-codec2] Codec2 repeater

2017-12-04 Thread Adrian Musceac
> > + OFDM isn't needed unless your bandwidth is significantly wider, as its > a flat fading channel. Single carrier PSK/QAM is fine and has a better > PAPR. M-QAM only needed if you want wideband data, not needed for voice > as we have good compression. > > + Can't seen any good reason for FDMA,

Re: [Freetel-codec2] Codec2 repeater

2017-12-04 Thread Adrian Musceac
handsets. Regards, Adrian On 12/4/17, Adrian Musceac <kanto...@gmail.com> wrote: > Hi Glen, > > I think David might have been referring to the OFDM mode used by > FreeDV, ie single user multicarrier. I was talking about multi-user > single carrier.

Re: [Freetel-codec2] TDMA and digital voice

2017-11-10 Thread Adrian Musceac
Hi, I know talking about proprietary SDR devices is probably frowned upon on this list, but doing TDMA with a modern SDR, let's say the Ettus USRP, is fairly easy and there is a lot of open source code for ex. GSM. Myself, I have been running a GSM network in amateur bands to play with some

Re: [Freetel-codec2] TDMA and digital voice

2017-11-11 Thread Adrian Musceac
Hi Ross, My initial GSM tests were done in the 70 cm band with low power (0.5 W). I recorded them here: https://www.youtube.com/watch?v=LC3GH0vp-iQ After that, as suggested by some local amateurs who are also part of the regulations comittees here, I moved it in the 1.2 GHz band with increased

Re: [Freetel-codec2] TDMA and digital voice

2017-11-05 Thread Adrian Musceac
Hi, I'm also working on some TDMA code (SDR based). There are a few issues. Codec2 frames are 40 ms which are a bit too long to fit into the slots (with guard times involved). Because code schedules radio bursts in the future and updates the scheduler clock every X frames, long delays are to be

Re: [Freetel-codec2] Codec2 repeater

2017-12-07 Thread Adrian Musceac
Thanks Jeroen, I'll take a look as advised. I had something similar in mind. Adrian On 7 December 2017 14:51:23 EET, Jeroen Vreeken <jer...@vreeken.net> wrote: >Hi Adrian, > >On 12/07/2017 11:27 AM, Adrian Musceac wrote: >> On 12/7/17, Sebastien F4GRX <f4...@f4grx.net&

Re: [Freetel-codec2] Ultra-reliable sensitive comms

2017-12-02 Thread Adrian Musceac
Hi, Channel coding will improve performance, depending on the type of code used. For example, in QRadioLink I use a rate 1/2 convolutional code, which leads to twice the symbol rate. This gives me an improvement of 3 dB over no code/half symbol rate mode. LDPC and puncturing would improve it even

Re: [Freetel-codec2] Codec2 repeater

2017-12-07 Thread Adrian Musceac
On 12/7/17, Sebastien F4GRX wrote: > > -replacement of DSTAR/DMR using codec2 and HAM CALLS as identifiers, using a > decentralized user database that prevents ANY SINGLE INDIVIDUAL from > controlling/restricting user access > Hi Sebastien, I understand your concern about

Re: [Freetel-codec2] Codec2 repeater

2017-12-06 Thread Adrian Musceac
Perhaps it is possible. However, we have repeaters around here with more than 200 km coverage radius, and I don't see TDMA solving both capacity and coverage. Time will tell. Glen, thanks for expanding on LTE. I am not deeply familiar with the LTE PHY and I don't intend to copy it, just

Re: [Freetel-codec2] Modulation Woes on SM1000

2018-06-13 Thread Adrian Musceac
> > By the way those views are via the freedv spectrum display. > > What I was thinking was the random numbers are of course hitting all > the tones equally, whereas the vocoder bits are not as pure, and may > in fact favor bit combinations over another. Maybe a sequence of the > same bit

Re: [Freetel-codec2] FYI: mode 2400B handheld

2018-01-10 Thread Adrian Musceac
Hi Jeroen, This is a very interesting project. If there's anything I would change, I would add a more powerful CPU, capable of running some other applications, like chat, maps, email, pictures. Otherwise you could end up for example receiving a position report but no being able to plot it without

Re: [Freetel-codec2] FYI: mode 2400B handheld

2018-01-10 Thread Adrian Musceac
On 1/10/18, Sebastien F4GRX wrote: > > -during your own developments, avoid reinventing the wheel. Focus on > existing > open standards when one exists. For example, use IP, TCP, and things like > that. > We have a full class-A 44/8 IP network reserved for our own ham use. That's

Re: [Freetel-codec2] FYI: mode 2400B handheld

2018-01-10 Thread Adrian Musceac
There was a project based on a CML Micro chip (the same one used in Tetra handsets), I think Bruce Perens was its godfather. It sounded very interesting considering those chips were not very expensive, but I have no idea what the status of that is currently. My main concern is coming up with a

Re: [Freetel-codec2] FYI: mode 2400B handheld

2018-01-10 Thread Adrian Musceac
On 1/10/18, Jeroen Vreeken wrote: > http://dmlinking.net > That's a very well architected project, and I'm not saying it lightly. Unfortunately the user docs are quite sparse, and it does not have enough visibility. Basically I would have liked to know if I could use that to

Re: [Freetel-codec2] FYI: mode 2400B handheld

2018-01-10 Thread Adrian Musceac
On 1/10/18, Sebastien F4GRX wrote: > Hello, > > Yes we need to get more people interested in open DV systems. > Lack of interest is a BIG problem. I have my own project which I mentioned here before. It's basically a PoC, a toy, without much use outside of making "cool" demos or

[Freetel-codec2] Codec2 700B small signal performance

2018-01-17 Thread Adrian Musceac
Hi, I made a short video demo of the Codec2 700B mode being tested on the 70 cm ISM band with low power transmissions: https://www.youtube.com/watch?v=mH0yScs5QB0 The performance is very good across the board, and the only thing I'm wishing for now is having the 700C and future 700D modes in my

Re: [Freetel-codec2] Codec2 700B small signal performance

2018-01-17 Thread Adrian Musceac
On 1/17/18, Tomas Härdin wrote: > What's the hardware? > > /Tomas > In this case, two USRP B200-mini. But I have obtained similar results with other hardware like the LimeSDR mini. Adrian -- Check

Re: [Freetel-codec2] OFDM and GNU Radio

2018-02-03 Thread Adrian Musceac
On 2/2/18, Steve wrote: > > If you look at FM radio stations on your SDR, you see the signal > duplicated on both sides of the carrier, and also a large carrier when > the modulation is low. I guess you could say FM has built-in > diversity. > Hi Steve, The FM signal

Re: [Freetel-codec2] OFDM and GNU Radio

2018-01-31 Thread Adrian Musceac
GNU radio is very powerful and easy to use. In 15 minutes you can create a radio by visually arranging some blocks, even without knowing too much about DSP. I'm surprised it hadn't got more traction within amateur radio community. Pretty much all types of radio have been simulated at this point

Re: [Freetel-codec2] ARM SBCs with SATA - was: Ubuntu 18 can't install subversion

2018-08-08 Thread Adrian Musceac
>Why would you need 100GB of storage? That's a LOT. I've been running >many a Linux host on 32GB of disk/ssd (or much less) for a very long >time. > My base Debian system is around 16 GB plus a lot of stuff in /home, so yes I think an embedded system without X and desktop environment

[Freetel-codec2] (Ab)using GNU radio to demodulate 4FSK signals as if they were QPSK

2018-08-15 Thread Adrian Musceac
Hi all, I know there are fans of GNU radio on this list, for the sake of simplicity of writing DSP code which leaves room for those of us not as well versed in the trade to experiment with Codec2. I wrote a short blog article on how to abuse the GNU radio blocks to soft decode 4FSK as if it was

Re: [Freetel-codec2] Support in freedv_api for FreeRepeater ala parrot

2018-08-22 Thread Adrian Musceac
> >Also, there has been no interest overseas or here in putting together a >repeater. Most disappointing. Hi Alan, Please don't be dissapointed. On HF, there is no big need for a repeater. The ionosphere is already in a way the repeater we need. A repeater would be creating some sort of

Re: [Freetel-codec2] Help Wanted

2018-03-08 Thread Adrian Musceac
Hi Alan, > > I ask, how far are we in being able to completely replace the firmware > in the lowly MD-380 and clone radios? Or, could we beef up the power in > the 7021, already used in the project!! > That (as in running Codec2 2400A) will never happen for technical reasons. Using an SDR

[Freetel-codec2] IP protocol over FreeDV

2018-03-24 Thread Adrian Musceac
Hi all, Has anyone attempted to send IP protocol on HF using FreeDV? I assume it would be as simple as replacing the voice payload with IP datagrams. I have a working TCP/IP modem on VHF, however it has lower weak signal performance than FreeDV. Regards, Adrian

Re: [Freetel-codec2] Message for Don Reid, develop on Banana Pi

2018-10-08 Thread Adrian Musceac
Hi Alan, Don't mean any disrespect, but this list is publically archived and readable, so anyone could login on your box. I'd advise you to change your password and email Don privately just in case. Regards, Adrian On October 9, 2018 2:09:48 AM UTC, Alan Beard wrote: >Hi Don, > >Noting your

Re: [Freetel-codec2] LPCNet at 1700 bits/s

2019-03-04 Thread Adrian Musceac
Hi David, I read your article with interest. I'm curious your efforts and how it scales for a normal person as opposed to a huge internet company. If I read the conclusions correctly, in order to achieve similar voice faithfulness as 8 kHz PCM, it seems that one needs to have a huge amount of

Re: [Freetel-codec2] LPCNet at 1700 bits/s

2019-03-05 Thread Adrian Musceac
al time. > >All an end-user needs is a decent CPU (e.g. a modern smartphone or >desktop/laptop) and a few MBytes of RAM (the synthesis executable is >10Mbytes unstripped). > >Instructions for trying it are on the LPCNet page. > >- David > >On 05/03/19 04:22, Adrian Mu

Re: [Freetel-codec2] Clone of Gqrx with transmit support

2019-09-08 Thread Adrian Musceac
gt;the 700D mode as this is becoming > >the most common mode? > >System here: Ubuntu 18.04 LTS on an Asus H110M m/b with a Pentium(R) >CPU G4560 @ 3.50GHz, no AVX/AVX2. > >(I do have AVX/AVX2 on another m/c) > >Alan VK2ZIW > >On Sun, 8 Sep 2019 17:47:14 +0300, Ad

Re: [Freetel-codec2] Improving quality of Codec2 playback

2019-09-11 Thread Adrian Musceac
c 2 1300 >FreeDV 700C/700D: Codec 2 700C > >I listened to you sample but am unsure if it was before or after your >processing, Do you have A/B samples to compare? > >Cheers, >David > >On 10/09/19 21:25, Adrian Musceac wrote: >> >> Hi David, >> I thin

Re: [Freetel-codec2] Improving quality of Codec2 playback

2019-09-10 Thread Adrian Musceac
> Hi David, > I think I can slightly improve the quality of playback of Codec2 samples > with some rather computationally cheap methods. This might be of use to you > for FreeDV. > Please have a listen at the sample attached, which is Codec2 at 1400 > bits/s. > Link included in case the attachment

[Freetel-codec2] Clone of Gqrx with transmit support

2019-09-07 Thread Adrian Musceac
Hi, I made a clone of Gqrx with transmit support for digital and analog voice, video and IP data. You can see it in action here: https://www.youtube.com/watch?v=9bxorlma7QU What I'd like to know is if people are interesting in transmitting and receiving FreeDV with SDR hardware. I'm looking at

Re: [Freetel-codec2] Clone of Gqrx with transmit support

2019-09-08 Thread Adrian Musceac
ork > and play projects, so that's a fine starting point. > > You might also consider a LPCNet codec mode. > > Cheers, > David > > On 08/09/19 04:04, Adrian Musceac wrote: > > Hi, > > I made a clone of Gqrx with transmit support for digital and analog > > voice, vi

[Freetel-codec2] FreeDV SDR transmitter and receiver with GNU radio

2019-09-21 Thread Adrian Musceac
Hi, I got FreeDV 1600 and 700C working with the PlutoSDR and the RTL-SDR. if anybody is interested: https://www.youtube.com/watch?v=s63SSf9Yhjg Many thanks to A. Maitland Bottoms who maintains the GNU radio FreeDV module. I feel that either I'm not setting the input gain into FreeDV correctly or

Re: [Freetel-codec2] FreeDV SDR transmitter and receiver with GNU radio

2019-09-21 Thread Adrian Musceac
>may work better for you. > > > >All the best. > > > > > >Walter/K5WH > > > >From: Adrian Musceac >Sent: Saturday, September 21, 2019 8:04 AM >To: freetel-codec2@lists.sourceforge.net >Subject: [Freetel-codec2] FreeDV SDR transmitte

Re: [Freetel-codec2] FreeDV SDR transmitter and receiver with GNU radio

2019-09-21 Thread Adrian Musceac
rent ways to use FreeDV, and enjoy hearing about the great >efforts. > > > >Very well done, and thanks for sharing your progress with us. > > > > > >Walter/K5WH > > > >From: Adrian Musceac >Sent: Saturday, September 21, 2019 10:50 AM >To: freet

Re: [Freetel-codec2] FreeDV SDR transmitter and receiver with GNU radio

2019-09-21 Thread Adrian Musceac
n UHF, perhaps the 2400B mode of FreeDV >may work better for you. > > > >All the best. > > > > > >Walter/K5WH > > > >From: Adrian Musceac >Sent: Saturday, September 21, 2019 8:04 AM >To: freetel-codec2@lists.sourceforge.net >Subject: [Freetel-codec2] FreeDV

[Freetel-codec2] ARM NEON instruction set

2019-12-15 Thread Adrian Musceac
Hi David, Do you have any idea if we could use any ARM optimizations for 2020 mode? I'm thinking of libvolk which can use SSE3, AVX and NEON and is the backend for GNU radio on ARM platforms. I have an ARM64 board and thinking of trying 2020 on it. Regards,

Re: [Freetel-codec2] transmit testing of 700C frames

2019-12-05 Thread Adrian Musceac
Hi Alan, I have seen these crashes myself, in the LDPC encoder, with memory corruption, in the libcodec2 version packaged in Debian Buster (0.8 if I recall correctly) . I believe they are 32 bit specific but I did not have the resources to investigate further. I have not tested on ARM 64 bit

Re: [Freetel-codec2] ARM NEON instruction set

2019-12-16 Thread Adrian Musceac
ns ported to NEON as >well as AVX, it's a build time option. > >About a year ago I did some work on getting the codec running in real >time on a Pi 3, but it wasn't fast enough. I have been told it runs in >real time on some faster ARM CPUs, like high end phones. > >Cheers, >Dav

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-20 Thread Adrian Musceac
sites, a computer at each end* > > > > * I'll investigate mumble and murmur as they are standard packages on the > Fedora 29 here. Alan VK2ZIW On Sun, 20 Oct 2019 11:22:20 +, Adrian > Musceac wrote* > > Alan, > > > > If you only want a cross-band repeater you don'

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-24 Thread Adrian Musceac
then, you want to move the baseband >left anyway, as the FM modulation bandwidth is probably about 16 kHz. > >On Wed, Oct 23, 2019 at 2:28 PM Adrian Musceac >wrote: >> >> So does this mean the input sample rate is also 48 kHz? That would >make it harder for me because all th

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-24 Thread Adrian Musceac
48 kHz. Some examples of command line operation of the mode at >the bottom of codec2/README.md > >Cheers, >David > >On 24/10/19 5:56 am, Adrian Musceac wrote: >> So does this mean the input sample rate is also 48 kHz? That would >make >> it harder for m

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-23 Thread Adrian Musceac
all of them 64bit. > >Today's PIC is a Pi3.  > >Alan VK2ZIW > >On Tue, 22 Oct 2019 17:40:13 +, Adrian Musceac wrote >> Alan, the instructions say one of openssl, polarssl/mbedtls or gnutls >>= 3.0 >> The cmake flag -DSSL selects what is used. >> >>

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-23 Thread Adrian Musceac
So does this mean the input sample rate is also 48 kHz? That would make it harder for me because all the other modes use 8 kHz... On October 23, 2019 4:20:48 PM UTC, Steve wrote: >On Wed, Oct 23, 2019 at 10:44 AM Adrian Musceac >wrote: >> >> Regarding mode 2400A, c

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-20 Thread Adrian Musceac
s band codec2 to FM repeater, can you give a quick run >down > >using your software? > >Alan VK2ZIW > >On Thu, 17 Oct 2019 22:44:01 +0300, Adrian Musceac wrote >> Hi David, >> >> Wow Adrian it's really coming along quickly!  Well done :-)  Combine

[Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-17 Thread Adrian Musceac
Hi, I made some more progress working on my application[1]. First of all, it is now possible to run it headless (maybe even daemonized) and control it remotely using a telnet client. Second, I have added support for mixed mode repeater (Codec2/FM or viceversa or any combination of modes like

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-17 Thread Adrian Musceac
wrote: > Hi Adrian, > > I am operating a repeater (OE3XNB) and would be interested to run a test. > What hardware do we need? > > 73's > > Gerhard OE3GBB > > > > Am 17.10.2019 14:00, schrieb Adrian Musceac: > > Hi, > I made some more progress working on

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-17 Thread Adrian Musceac
Hz with some other MyriadRF hardware. There's the https://osmocom.org/projects/osmo-fl2k/wiki project which gives you a very cheap SDR transmitter as well but with the same limitations. Best regards, Adrian > Cheers, > David > > On 17/10/19 10:30 pm, Adrian Musceac wrote: > > Hi,

Re: [Freetel-codec2] FreeDV/Codec2 to FM mixed mode repeater and network connection in QRadioLink

2019-10-22 Thread Adrian Musceac
. > >But all the function names are different. > >Not easy. > >Alan VK2ZIW > >On Sun, 20 Oct 2019 16:57:58 +0300, Adrian Musceac wrote >> Alan, >> >> Use this version of umurmur: https://github.com/qradiolink/umurmur >> It is slightly older but verifie

[Freetel-codec2] Fwd: Open Workshop on Machine Learning in Communications @ IEEE ICC 2020 (Call for Contributions)

2020-01-25 Thread Adrian Musceac
Hi, I hope I'm not spamming, but the below message circulated on the GR list seems to fit well with the latest work done in Codec2. Regards, Adrian___ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net

Re: [Freetel-codec2] Codec2 vs MELPe: high bitrates and sound quality

2020-01-11 Thread Adrian Musceac
Hi Maks Karpov, I observed similar quality degradation on some of my voice samples, and sent pathological samples to David for analysis. What I can say for sure is language has nothing to do at all. I fixed my problems by lowering audio input levels, filtering of input to take out very low

Re: [Freetel-codec2] Comments on the M17 project

2020-10-26 Thread Adrian Musceac
teway components are being worked >next.  >> > > His early comment below. >> > >  >> > >   >> > >  >> > > Hi All >> > >  >> > > I've just finished the first round of developing M17 support for >the >> > > MMDVM. It is based on the current specification of M17, but it is >a >

Re: [Freetel-codec2] Comments on the M17 project

2020-10-24 Thread Adrian Musceac
Hi Walter, Is there like a mailing list of the project or something? Adrian On October 24, 2020 4:13:56 PM UTC, walt...@k5wh.net wrote: >Several of us have been working with M17 for the past week, using the >Mvoice linux client, and it's working quite well with the reflectors >they have in

Re: [Freetel-codec2] Comments on the M17 project

2020-10-26 Thread Adrian Musceac
On October 26, 2020 1:54:21 PM UTC, Mel Whitten wrote: >Yes, Mumble is popular with QRQ CW ops also. THey run a Mumble server >providing low latency QSOs for speeds up to and sometimes exceeding >100wpm. > >http://qrqcwnet.ning.com/ > > > >Mel > >K0PFX > >

[Freetel-codec2] FreeDV data mode

2020-08-09 Thread Adrian Musceac
Hi David, I've watched with interest your recent foray into FreeDV data transmission. There's a new and interesting project called HNAP (https://hnap.de ) which has the same goals (long distance IP links). The project is well described in this year's SDRA talk by Lukas O. Inspired by both your

Re: [Freetel-codec2] FreeDV data mode

2020-08-09 Thread Adrian Musceac
irip > >3/ Steve and I have also been work on the HF data modes. We have >initial versions of 3 new OFDM/LDPC data modes running in C, between 10 >and -5dB SNR. Next step is some tuning and QAM16. That modem might >also run OK at higher rates on VHF and above, but we haven

Re: [Freetel-codec2] FreeDV data mode

2020-08-09 Thread Adrian Musceac
junk. Comparably, the Pluto is much more >hobby oriented with the ability to run Linux. Still running after >several years. It's not cheap at $250 USD, but think of it as a Pi >combined with a radio. > >On Sun, Aug 9, 2020 at 1:29 AM Adrian Musceac >wrote: >> >> Hi

Re: [Freetel-codec2] freedv.org server down

2020-08-02 Thread Adrian Musceac
Hi Bruce, I had a quick look at the website and it doesn't look like it needs to process user input anywhere. There are quite good static site generators these days, Pelican among others (If you don't fancy writing HTML by hand). Eliminates these kind of issues. Might be worth a look. Best

Re: [Freetel-codec2] FreeDV data mode

2020-08-09 Thread Adrian Musceac
Toko filters are a few dollars retail. On August 9, 2020 11:14:34 PM UTC, Steve wrote: >I may have to download Elsie then and grab a pencil to make some >coils... >:-) > >http://www.tonnesoftware.com/elsie.html > > > >On Sun, Aug 9, 2020 at 6:02 PM Adrian Musceac >

Re: [Freetel-codec2] Are we being distracted by LPCnet

2020-07-25 Thread Adrian Musceac
Free software is not popular at all among end users and it will probably never be as popular as closed software. Instead, free software is incredibly popular and successful for enterprise users and companies. Right now, from the largest 8 software companies in the world, only one does not

Re: [Freetel-codec2] Do we need these comments

2020-12-07 Thread Adrian Musceac
Everybody is entitled to an opinion, that doesn't mean we all have to share it. Mode 700C sounds fine for the bitrate, and so does mode 1400 and 1600. David you've made a great effort with them, we're more than a few users who never use HF and are perfectly satisfied with the current technology

Re: [Freetel-codec2] Do we need these comments

2020-12-07 Thread Adrian Musceac
bility, interference immunity and >fault-free operation  under bad ionospheric conditions are unbeatable. > >DC6NY > >Am 07.12.2020 um 09:53 schrieb Adrian Musceac: >> Everybody is entitled to an opinion, that doesn't mean we all have to >> share it. >> Mode 700C sounds

Re: [Freetel-codec2] Codec2 vs Lyra?

2021-02-28 Thread Adrian Musceac
amount of data for training the model. I will read the paper, thanks David, I was browsing mobile and didn't see the link. Adrian On February 28, 2021 9:35:45 PM UTC, Greg Maxwell wrote: >On Sun, Feb 28, 2021 at 12:41 PM Adrian Musceac >wrote: >> While interesting and newsworthy

Re: [Freetel-codec2] Codec2 vs Lyra?

2021-02-28 Thread Adrian Musceac
While interesting and newsworthy, I'd assume from the start that this codec has the same advantages and pitfalls as other ML applications, i.e. works very well in 90% of cases and fails dramatically in 10% of edge cases. Even though the page specifies it is aimed at a completely different

[Freetel-codec2] Bit error artefact handling comparison between Codec2 and Opus

2021-04-17 Thread Adrian Musceac
Hi, I have done some investigation recently into the comparative bit error handling of Codec2 and Opus over the air with a VHF modem. I have saved some audio files from the results which can be loaded in Audacity. Codec2 samples had a bitrate of 1400 bps, Opus samples had a bitrate of 9400

Re: [Freetel-codec2] Updating the libcodec2 binding in FFmpeg, fixed-point decoding

2023-12-29 Thread Adrian Musceac
I personally very much doubt that. You can get a higher symbol rate by tapping a CW key. On 29 December 2023 12:54:02 UTC, "Tomas Härdin" wrote: > >I think Dave posted on his blog a while back that the effective data >rate of human speech is on the order of 1-10 bit/s or so

Re: [Freetel-codec2] Linux-preferred desktop FreeDV?

2023-11-23 Thread Adrian Musceac
KDE Plasma 5 on Debian works well too. I think it's more like an issue of the distro packaging all the dependencies in a consistent manner. Adrian On 23 November 2023 00:35:11 UTC, Mooneer Salem wrote: >Hi Glen, > >I'm not sure it actually matters given FreeDV's use of wxWidgets. While I