soh@shiva.trl.oz (kam hung soh) (09/17/90)
In article <85485@aerospace.AERO.ORG> huebner@sunpoison.UUCP (Robert E. Huebner) writes: > .... The throughput of a compressed data stream is hardly constant. Many >download protocols give you an indication of the current BPS for this >very reason. Using something like an HST-DS (Dual Standard) V.32 you get >more compression transmitting a text file than something that's been >.lzh'ed. There is a significant speed increase on both, however. I wouldn't >say "little is gained." I think the speed achievable is still on the >order of 2:1 for even the most densely packed files using HST-DS. I'm slightly puzzled. Could someone explain why there would be such a large increase in transmission speed - even for .lzh'ed files? Wouldn't the compression first performed on the source file be the best possible? (Forgive my ignorance - I'm slowly plodding through compression algorithms as a hobby) ----- Soh, Kam Hung email: h.soh@trl.oz.au tel: +61 03 541 6403 Telecom Research Laboratories, P.O. Box 249, Clayton, Victoria 3168, Australia