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well google is saying that 312.5hz and 3khz are important to Russian Low Frequency Radio Stations... something about timecode. > Date: Fri, 14 Nov 2008 20:42:15 -0500 > From: plutek@xxxxxxxxxxxx > To: matt@xxxxxxxxxxxxxx > CC: linux-audio-user@xxxxxxxxxxxxxxxxxxxx > Subject: Re: [Slightly OT] 312.5Hz > > >Date: Sat, 15 Nov 2008 11:51:35 +1030 > >From: Matthew Smith <matt@xxxxxxxxxxxxxx> > > >Slightly off-topic, but does anyone here know any audio significance of > >312.5Hz? > > > >I have here a module from a piece of equipment dated back to 1968. It > >consists of a 4-pole, 50Hz motor, a printed disc, a lamp and a > >photocell. The printing on the disc (rotor) is a wiggly line of > >changing frequency which - according to the disc - represents a signal > >between 312.5Hz and 3kHz when spinning at 1500rpm. You light the lamp, > >spin the motor, then amplify the signal from the photocell. > > very cool. do you have somewhere that you could post a picture of this thing? i'd love to see it! > > >What I was wondering was whether end frequencies coincided with any > >musical notes. > > not in the western equal-tempered scale, anyway. > see http://www.phy.mtu.edu/~suits/notefreqs.html > > > cheers! > > -- > .pltk. > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user Stay up to date on your PC, the Web, and your mobile phone with Windows Live Click here |
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