schuch@xroads.UUCP (John Schuch) (05/31/91)
I was looking at a fax machine the other day and the flyer said it could tell if the incomming call was a fax or a voice. How can it tell? John -- The Arizona High-Tech Times John R. Schuch , Editor (602) 967-7444 via the Crossroads : hplabs!hp-sdd!crash!xroads!schuch
dbell@cup.portal.com (David J Bell) (06/03/91)
> >I was looking at a fax machine the other day and the flyer said it >could tell if the incomming call was a fax or a voice. >How can it tell? >John >-- >The Arizona High-Tech Times >John R. Schuch , Editor >(602) 967-7444 >via the Crossroads : hplabs!hp-sdd!crash!xroads!schuch Well, if the call was from Bobby McFerrin, maybe it couldn't! The calling station puts a tone on the line, as soon as the connection goeas through. The receiving station recognizes it and reponds (handshakes) with a return tone. If the caller *doesn't* supply the tone, the "smart fax" assumes it is a person calling, and 1) Rings the local "bell" on the fax machine 2) Supplies a simulated ring signal to the caller Dave
ssave@ole.UUCP (Shailendra Save) (06/03/91)
From article <1118@xroads.UUCP>, by schuch@xroads.UUCP (John Schuch): > > > I was looking at a fax machine the other day and the flyer said it > could tell if the incomming call was a fax or a voice. > How can it tell? Frequency. Digital messages work on two frequencies only. One for a high logic level, one for a low. A voice contains a lot of others. A simple notch filter to a voice detecting ckt would tell the difference. > John > hplabs!hp-sdd!crash!xroads!schuch
schuch@xroads.UUCP (John Schuch) (06/09/91)
Would whoever sent me mail about my fax question please send it again? While learning this system, I nuked my mail, oops! John The Arizona High-Tech Times John R. Schuch , Editor (602) 967-7444 via the Crossroads : hplabs!hp-sdd!crash!xroads!schuch -- The Arizona High-Tech Times John R. Schuch , Editor (602) 967-7444 via the Crossroads : hplabs!hp-sdd!crash!xroads!schuch