Hello Gullik, Thanks fort he information. I am working on a projekt using gnuradio V3.5 to set up a RX/TX loop for the existing codec2 2500 bps block and than change it for 1400 pbs, using an OFDM modem. Using this loop it could be possible to feed the modem signal as audio into and from a SSB TRX also. But at the moment I am still having problems to build gnuradio V3.5 on ubuntu. The codec2 blocks are allways missing. Is there anyone having the same problem?
73's Gerhard OE3GBB -----Ursprüngliche Nachricht----- Von: Gullik Webjörn [mailto:[email protected]] Gesendet: Donnerstag, 15. Dezember 2011 13:47 An: [email protected] Betreff: [Freetel-codec2] 1400 bits/sec is actually 1325... David, I note that the current codec2 bitstream is rounded up to 7 whole bytes, when it is actually 53 out of 56 possible bits. Do you have a plan for the remaining bits? As I understand, you produce 2 frames, even + odd, but they are always "sent" as a pair. One way to use them, would be to have that field as a ever incrementing frame-pair number, if that was the case, it would be probable that frame-pair synch could be achieved on a raw stream of bits, since 3 bits out of 56 would be predictable. Of cource, any other scheme such as a constant could also be used. My reason for asking, is that I am trying to set up something over the air, for demoing and evaluation and to do some work on BER and channels.....any provisional use would be torn up by "next version". If audio information enhancing the codec2 (is planning to) use this field, then thats probably wiser.... Fantastic work !!! Best Regards, Gullik ---------------------------------------------------------------------------- -- 10 Tips for Better Server Consolidation Server virtualization is being driven by many needs. But none more important than the need to reduce IT complexity while improving strategic productivity. Learn More! http://www.accelacomm.com/jaw/sdnl/114/51507609/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ 10 Tips for Better Server Consolidation Server virtualization is being driven by many needs. But none more important than the need to reduce IT complexity while improving strategic productivity. Learn More! http://www.accelacomm.com/jaw/sdnl/114/51507609/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
