[LAU] [Slightly OT] 312.5Hz

sam javor zekthedeadcow at hotmail.com
Fri Nov 14 20:49:08 EST 2008

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 at infinity.net
> To: matt at smiffytech.com
> CC: linux-audio-user at lists.linuxaudio.org
> Subject: Re: [LAU] [Slightly OT] 312.5Hz
> >Date: Sat, 15 Nov 2008 11:51:35 +1030
> >From: Matthew Smith <matt at smiffytech.com>
> >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.
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