>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
