Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!snorkelwacker!mit-eddie!uw-beaver!zephyr.ens.tek.com!tekcrl!tekgvs!arnief From: arnief@tekgvs.LABS.TEK.COM (Arnie Frisch) Newsgroups: sci.electronics Subject: Re: I don't need HDTV! Message-ID: <7143@tekgvs.LABS.TEK.COM> Date: 21 Mar 90 00:23:59 GMT References: <9662@pixar.UUCP> <1990Mar20.162041.4639@ux1.cso.uiuc.edu> <2070@sauron.Columbia.NCR.COM> Reply-To: arnief@tekgvs.LABS.TEK.COM (Arnie Frisch) Organization: Tektronix, Inc., Beaverton, OR. Lines: 19 In article <2070@sauron.Columbia.NCR.COM> wte@sauron.UUCP (Bill Eason) writes: >In article <1990Mar20.162041.4639@ux1.cso.uiuc.edu> forbes@aries.scs.uiuc.edu (Jeff Forbes) writes: >Enter here the Nyquist criterion which says that the sampling frequency >(44.1 kHz really) must be >= two times the highest analog frequency being >recorded. Therefore, the highest frequency which can be accurately >reproduced from a 44.1 kHz digital recording is 22.05 kHz, which is within >the range of hearing of several folks posting here. I suspect my audible >range reaches up there, too, since I can hear department store burglar >alarms and CRT flyback transformers. And do you and your friends have shaggy coats and waggly tails? I don't know what frequency you think you are hearing, but I seriously doubt that its 22 kHz. TV flybacks run at 15,750 (approx), and sometimes you can hear a subharmonic of higher frequency oscillators - but as far as hearing 22kHz, that's strictly for the dogs and birds. Arnold Frisch Tektronix Laboratories