--- In digitalradio@yahoogroups.com, "Ed Hekman" <[EMAIL PROTECTED]> wrote: > > I found the specifications. The spec used for broadcast DRM can be > found here: > > http://webapp.etsi.org/exchangefolder/es_201980v020101p.pdf > > The WinDRM spec can be found here: > > http://www.qslnet.de/member/hb9tlk/drm_h.html
The WinDRM specification is very sketchy but after a quick review it suggests that the speech data rate is near the minimum possible and there is little room for additional FEC coding. The documment suggests that the minimum data rate for voice is 1000 bits per 400 ms frame (2.5 kbps). The subcarrier modulation is QAM16 or QAM64 and there are two levels of FEC to choose from but the FEC is not described. The interleaving of the pilots and overhead data is described but not the interleaving of the voice data. I will have to have a conversation with one of the speech codec designers I work with. Ed Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
