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well google is saying that 312.5hz and 3khz are important to Russian Low Frequency Radio Stations... something about timecode.<br><br><br><br>> Date: Fri, 14 Nov 2008 20:42:15 -0500<br>> From: plutek@infinity.net<br>> To: matt@smiffytech.com<br>> CC: linux-audio-user@lists.linuxaudio.org<br>> Subject: Re: [LAU] [Slightly OT] 312.5Hz<br>> <br>> >Date: Sat, 15 Nov 2008 11:51:35 +1030<br>> >From: Matthew Smith <matt@smiffytech.com><br>> <br>> >Slightly off-topic, but does anyone here know any audio significance of <br>> >312.5Hz?<br>> ><br>> >I have here a module from a piece of equipment dated back to 1968. It <br>> >consists of a 4-pole, 50Hz motor, a printed disc, a lamp and a <br>> >photocell. The printing on the disc (rotor) is a wiggly line of <br>> >changing frequency which - according to the disc - represents a signal <br>> >between 312.5Hz and 3kHz when spinning at 1500rpm. You light the lamp, <br>> >spin the motor, then amplify the signal from the photocell.<br>> <br>> very cool. do you have somewhere that you could post a picture of this thing? i'd love to see it!<br>> <br>> >What I was wondering was whether end frequencies coincided with any <br>> >musical notes.<br>> <br>> not in the western equal-tempered scale, anyway.<br>> see http://www.phy.mtu.edu/~suits/notefreqs.html<br>> <br>> <br>> cheers!<br>> <br>> -- <br>> .pltk.<br>> _______________________________________________<br>> Linux-audio-user mailing list<br>> Linux-audio-user@lists.linuxaudio.org<br>> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user<br><br /><hr />Stay up to date on your PC, the Web, and your mobile phone with Windows Live <a href='http://clk.atdmt.com/MRT/go/119462413/direct/01/' target='_new'>Click here</a></body>
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