); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY
I have paid my dues in the HiFi world, but I have always insisted that there be a solid scientific basis for any product I bought. When faced with claims that picosecond jitter can be perceived by the human ear, my flim-flam-o-meter blows a fuse. A 1 nsec phasemodulation of a 44100 kHz clock signal will, worst case, come out to an noise component 87 dB below the intended signal: 1/44100 [Hz] = 22.675 [uS] 22.675 [uS] / 1 [nS] = 22675 [ratio] 20 log(22675) = 87 dB And that is even assuming that the two relevant samples have opposite signs, an impossible situation according to the Nyquist criteria. I find such hifi-nut claims particularly ridiculous, considering that every single loudspeaker on the market is designed in defiance of how electromagnetism works. All amplifiers and loudspeakers on the market are designed assuming that the task is to hold the voltage across the speaker terminals proportional to the desired sound signal, despite the fact that the magnetic field induced in the speakers coil is proportional to the current, not the voltage. Who in their right mind will claim that they can hear a distortion of -87dB, on speakers designed contrary to Maxwells equations ? And do I need to mention that very few rooms sport a S/N better than about 50 dB these days, and that requires you to turn the music up so loud that you are waaaay out of your ears most sensitive range ? I'm totally with Randi.org on this one. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.