> -----Ursprüngliche Nachricht----- > Von: digitalradio@yahoogroups.com > Gesendet: 12.01.07 22:24:49 > An: digitalradio@yahoogroups.com > Betreff: Re: [digitalradio] Re: Pactor versus Olivia
> > Here's a modest proposal: compress most of the QSO the way the > moonbounce modes do, by knowing what is expected at that point and > expressing it in a few bits. For PSK, we could just standardize on > macro names for a few things and the two modems can negotiate about > whether to expand them on TX or RX. > > Instead of sending "Your RST is 599" when the macro is RST the TX could > just send "^RST" and the RX modem can expand this into "Your RST is > 599." And if you send "^STATION ^BRAG" the RX program can just print > "OM sent you a big list of his computer equipment." > > This might also eliminate a lot of the uppercase text as well... > For a standard PSK31 qso you could actually reduce this to 1 byte per concept. (^STATION ^BRAG) could easily be coded as '!'' For pskmail, which does not know what it will get an international word table of some 18000 words codes words into 1 (most used) or 2 bytes. Supercalifragilisticexpialidocious = 'xP'. Rein > Leigh/WA5ZNU > On Fri, 12 Jan 2007 1:02 pm, Rein Couperus wrote: > > > >> -----Ursprüngliche Nachricht----- > >> Von: digitalradio@yahoogroups.com > >> Gesendet: 12.01.07 17:09:44 > >> An: digitalradio@yahoogroups.com > >> Betreff: RE: [digitalradio] Re: Pactor versus Olivia > > > > > >> By the way, I have often wondered why the B2F binary compression > >> system > >> used with the Winlink 2000 system has never been used for nearly a 2:1 > >> compression for improved throughput. This could be applied to any > >> system, including keyboarding. > >> > >> 73, > >> > >> Rick, KV9U > >> > >> > > > > Unfortunately this won't work. BZ2 compression is based on 'redundancy' > > in a message. There is hardly any redundancy in short messages as used > > in k-to-k. > > > > The only way you can do that is by using context-based compression, > > like the 'context based huffman' compression in pskmail, which reaches > > compression factors of 1 ... 50 : 1. > > > > Rein PA0R > > > > (by the way, it is open source). > > > > -- > > http://pa0r.blogspirit.com > > > > > > > > Announce your digital presence via our DX Cluster > > telnet://cluster.dynalias.org > > > > Our other groups: > > > > http://groups.yahoo.com/group/dxlist/ > > http://groups.yahoo.com/group/themixwgroup > > http://groups.yahoo.com/group/contesting > > http://groups.yahoo.com/group/wnyar > > http://groups.yahoo.com/group/Omnibus97 > > > > > > Yahoo! Groups Links > > > > > > > > http://docs.yahoo.com/info/terms/ > > > Announce your digital presence via our DX Cluster > telnet://cluster.dynalias.org > > Our other groups: > > http://groups.yahoo.com/group/dxlist/ > http://groups.yahoo.com/group/themixwgroup > http://groups.yahoo.com/group/contesting > http://groups.yahoo.com/group/wnyar > http://groups.yahoo.com/group/Omnibus97 > > > Yahoo! Groups Links > > > > -- http://pa0r.blogspirit.com Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 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/
