fgk@well.UUCP (Frank G Kienast) (07/17/89)
> thousands upon thousands of dead cockroaches could be found. > The dead mass of *** YUCK *** interfered with the crossed taught wires > (Strain guage) -thereby producing erroneous measurements. > WHY ? Well, after a little research they discovered someone who affirmed > that the resonance or vibrations on these wires caused by (lots of > verbage) produced a 14KHZ sound wave. This just so happens to be the > mating frequency of la cucharacha..the despised cockroach. Then wouldn't cockroaches also be attracted to TV sets? TV sets produce sound at 14.7KHZ. In real life: Frank Kienast Well: well!fgk@ucbvax.Berkeley.EDU CIS: 73327,3073 V-mail: 804-980-3733
davidc@vlsisj.VLSI.COM (David Chapman) (07/19/89)
In article <12726@well.UUCP> fgk@well.UUCP (Frank G Kienast) writes: >> [stuff deleted] >> verbage) produced a 14KHZ sound wave. This just so happens to be the >> mating frequency of la cucharacha..the despised cockroach. > >Then wouldn't cockroaches also be attracted to TV sets? TV sets produce >sound at 14.7KHZ. > U.S. TV sets scan at 15.75 kHz, not at 14.7. The flyback transformer tends to whine at that frequency (drives me nuts if it's too loud). -- David Chapman {known world}!decwrl!vlsisj!fndry!davidc vlsisj!fndry!davidc@decwrl.dec.com
davidb@cognos.UUCP (David Borowski) (07/19/89)
In article <12726@well.UUCP> fgk@well.UUCP (Frank G Kienast) writes: stuff about scale deleted. >Then wouldn't cockroaches also be attracted to TV sets? TV sets produce >sound at 14.7KHZ. > >In real life: Frank Kienast >Well: well!fgk@ucbvax.Berkeley.EDU >CIS: 73327,3073 >V-mail: 804-980-3733 I don't normally correct but! tv horizontal scan is 15750 HZ 30*525 scan lines and as a blind person i don't watch the stupid thing anyway. bad info does everyone a disservice. so before things go on the net check that the data is correct. I depend on verbal and online communication for my memories data base and don't need to fill it with junk! -- David Borowski Cognos Incorporated S-mail: P.O. Box 9707 Voice: (613) 738-1338 ext 5555 3755 Riverside Drive FAX: (613) 738-0002 Ottawa, Ontario uucp: uunet!mitel!sce!cognos!davidb CANADA K1G 3Z4
ISW@cup.portal.com (Isaac S Wingfield) (07/25/89)
David Borowski writes:
I don't normally correct but! tv horizontal scan is 15750 HZ 30*525 scan lines
Well, actually, this is correct for B&W only, and we don't get much of
that any more...
The horizontal scan rate for NTSC color is 15734.26 Hz or thereabouts.
The vertical rate is 59.94, and both are exact submultiples of the
color subcarrier, at 3579545 Hz.
The reasons for this have to do, at least partly, with attempts
to minimize interference between video and audio by controlling
the video signal spectrum. By locking everything together, most
of the energy is in a "comb", and the sound subcarrier fits neatly
in between.
Regards, Isaac
isw@cup.portal.com