Onno: We've actually done something similar on the local broadcast (after the national broadcast).
I second David's comments above about using the command line modems, will be far easier. One thing to note is the end result is going to depend *heavily* on how the broadcast gets to air. I know around here that the 'originating' source of the broadcast (VK5RAD) has some pretty bad audio issues, and some of the other broadcasts (i.e. 40m) are re-broadcasts of that one, compounding the issue. The end result can sound pretty bad, and once you add codec2 modulation and demodulation to that, it may not come across very well. Just some food for thought... Cheers, Mark VK5QI On Thu, Jul 23, 2015 at 11:11 AM, David Rowe <[email protected]> wrote: > Hi Onno, > > Yayy, the mailing list is working again! > > Good questions. > > If you are OK with Linux (and when codec2-dev SVN is alive again), you > can use the command line freedv_tx/freedv_rx programs to process a wave > file: > > (build codec-dev as per readme) > $ cd build_linux/src > $ ./freedv_tx 1600 speech.wav modem_signal.wav > $ ./freedv_rx 1600 modem_signal.wav speech_decoded.wav > > speech.wav should be sampled at 8kHz, 16 bit integer (short) samples, mono. > > Or send me a wave file you want processed and I'll run it for you. > > Cheers, > > David > > > On 23/07/15 09:42, Onno Benschop wrote: > > Hi all, > > > > While Andrew Smith (VK6PDQ/VK6AS) is on holiday I have his SM1000 to > > play with. Nice piece of kit. (I added 4 feet to it, makes it stay on > > the bench - > > > http://www.bunnings.com.au/madico-surface-protection-8mm-vinyl-rnd-clr-23260cf_p3979381 > ) > > > > For an episode* of "What use is an F-call?" - I want to achieve the > > following: > > > > * Record some audio that has been transcoded using CODEC2, so that > > listeners get a sense of the difference between analogue and digital > > audio. > > * Record some digital - non-decoded - audio, so listeners can hear > > what CODEC2 sounds like on-air. > > * Record some digital - non-decoded - audio and put it as a > > "sub-audible" signal underneath some normal analogue audio, so > > listeners get two information streams for the price of one. > > > > I am unclear what audio levels come and go from the SM1000 and I don't > > want to blow up either ports on the unit or my computer. > > > > I have installed FreeDV onto a Debian Wheezy virtual machine. (Running > > on a Mac, so no "microphone port", just a "line level port". > > > > I also have a Heil headset and an audio mixer. > > > > I've been trolling the documentation, the wiki and other information, > > but I'm not clear on how to achieve this electrically. > > > > Any pointers would be gratefully accepted. (And when I achieve it, I'll > > document it, so I won't forget how to do it later ;-) > > > > I also came across instructions to compile CODEC2 from source, but I > > cannot seem to checkout from the repository. Not sure if that is because > > of the SF outage > > [ > http://sourceforge.net/blog/sourceforge-infrastructure-and-service-restoration-update-for-722/ > ], > > or because of a configuration problem at my end. > > > > Look forward to hearing from you. > > > > * Technically, "What use is an F-call?" no longer exists. As of a few > > months ago it's now called "Foundations of Amateur Radio", but the > > national news is about a year behind, so nationally this won't be heard > > for a little while. > > -- > > Onno Benschop > > > > ()/)/)() ..ASCII for Onno.. > > |>>? ..EBCDIC for Onno.. > > --- -. -. --- ..Morse for Onno.. > > > > If you need to know: "What computer should I buy?" http://goo.gl/spsb66 > > > > ITmaze - ABN: 56 178 057 063 - ph: 04 1219 8888 - > > [email protected] <mailto:[email protected]> > > > > > > > ------------------------------------------------------------------------------ > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >
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