Hello, I haven't tested it but I think 10-12 bits would be fine. The modem is designed to handle SNRs of 5dB which is about the SNR from a 2-bit ADC (1 sign bit and 1 magnitude bit).
However to test this properly you could simulate the quantisation to 10 or 12 bits between the mod and demod and measure the BER compared to the full 16 bits. Cheers, David On Sun, 2012-05-27 at 22:32 +0200, Gullik Webjörn wrote: > Hi, > > I would like to understand the issues of > sampling resolution for the fdmdv modem. > > What would be the impact of using 10 or 12 bits > of resolution for the audio signal before passing > it on to the fdmdv demodulator? > > The max dynamic range would of course shrink to > 60 -72 dB, but 60 dB still seems a good number to me. > > What are your thoughts on the propagated errors > from math, if the sampling would be 10-12 instead of 16 bits? > > Regards, > > SM6FBD /Gullik > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
