Maybe try using some of the raw files samples in codec2-dev/raw first, see if they work OK.
Are your raw/wav files mono? I use sox for all these sorts of conversion. Cheers, David On 27/08/15 11:16, Onno Benschop wrote: > After banging my head on the wall for a little while I now have a > modicum of success. (Fair warning, a "but" is coming...) > > * I have translated a source 256k mp3 into a 16 bit/8k wav file - it > loses a little dynamic range, but that is to be expected > * I have translated the wav into a raw file using wav2raw.sh > * I have used freedv_tx 1600 to "transmit the file" to an encoded.raw file > * I have used freedv_rx 1600 to "receive the file" to a decoded.raw file > > But ... > > When I play back either the encoded.raw or decoded.raw files (using > playraw.sh), I get some interesting results. > > * The audio level for encoded.raw is pretty low, discernible, but low. > * The audio output for the decoded.raw is readable, but nothing at all > like the sample files. I can make out what I'm saying, but only > because I said it. > > > Can someone please point at the idiot mistake I'm making? > > o > > > > On 23 July 2015 at 17:25, Mark Jessop <[email protected] > <mailto:[email protected]>> wrote: > > 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] > <mailto:[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]> > <mailto:[email protected] <mailto:[email protected]>> > > > > > > > > ------------------------------------------------------------------------------ > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > [email protected] > <mailto:[email protected]> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > <mailto:[email protected]> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > <mailto:[email protected]> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > -- > 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
