aa777888athotmaildotcom escribió: > --- In digitalradio@yahoogroups.com, "Simon \(HB9DRV\)" <simon.br...@...> > wrote: > >> Thinking to myself - when we use a mode such as Olivia / MT63 with extensive >> error correction, why don't we compress the text? >> >> Given that fldigi has the wrap feature then surely compression could be / >> should be considered for some modes? >> >> I think I'll add something in my own code that shows the saving were the >> standard ZIP compression algorithm to be applied my gut feeling is a saving >> of 80%, I'll report back later today. >> >> Simon Brown, HB9DRV >> www.ham-radio-deluxe.com >> >> > > Great idea! And as you point out it's really only a good idea for modes with > extensive error correction as a dropped character has more dire consequences > when the data is compressed. New sub-modes, perhaps? > > Best regards, > > Scott > For file transfer, compression is a blessing, you reduce the channel occupancy and the chances of QRM and QSB ruining your transfer.
The gains depend on the amount of redundancy, and it amounts around 50% on the average, JNOS can use LZW compression for SMTP tranfers, which may amount a large transfer size reduction. JNOS can "automagically" decode eitrher compressed or uncompressed traffic. I understand that sources are free. For BBS forwarding, compressed FBB transfers averaged 50 percent "increase of thruput" or channel occupancy, depending on what is most important to you.. So, compression may certainly be your friend. 73, Jose, CO2JA __________ Información de ESET NOD32 Antivirus, versión de la base de firmas de virus 3832 (20090206) __________ ESET NOD32 Antivirus ha comprobado este mensaje. http://www.eset.com Participe en Universidad 2010, del 8 al 12 de febrero de 2010 La Habana, Cuba http://www.universidad2010.cu --------------------------------------------------------------------- SEGUNDO SEMINARIO INTERNACIONAL LEGADO Y DIVERSIDAD. ARQUITECTURA Y URBANISMO. El rescate de los valores urbanos y arquitectónicos en tiempos de globalización Colegio de San Gerónimo, La Habana Vieja, noviembre 24-27, 2009 ---------------------------------------------------------------------
