On Thu, May 19, 2011 at 1:02 AM, Jeremy Visser <jer...@visser.name> wrote: > Jake Anderson said: >> A filter that blocks frequencies not used for voice could well >> improve the SNR as delivered to the ear. (The ear being quite able to >> hear frequencies outside the range of the PSTN). > > ADSL uses frequencies above 25 kHz. > > Human hearing can hear frequencies up to 20 kHz, while working its way > down to 16 kHz with age. > > Can you hear ADSL?
My answer to that is a qualified "yes". Back in my early, early days of ADSL, I lived in a renter premises which had a wall-mounted Telstra phone. I had a tough time getting a filter for it, so I ran it without out (ADSL modem was on another socket). When I picked up the phone I could distinctly hear the data carrier - and the phone definitely interrupted any data based activity which was going on at the time. No idea if that's the case these days with ASDL2+ - I actually have a proper, working filter now. :-) DaZZa -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
