Converting between Hz and octaves?

Javachip · 6th April 2006, 12:47 AM

Is there a conversion table or formula somewhere? Thanks.

AudioFreak · 6th April 2006, 12:57 AM

It's not a a set conversion but rather a relative relationship. Everytime you double or halve the frequency, you cover an additional octave. So, 10 to 20Hz is an octave and also 5kHz to 10kHz is an octave.

HeatMiser · 6th April 2006, 03:35 AM

If you want to correlate with notes, the usual starting point is the A above middle C, at 440 Hz. From there it's a matter of doubling and halving as AudioFreak said.

There may be a table somewhere, but individual notes in between the "A"s quickly start to take on awkward values with lots of places after the decimal point.

heater · 6th April 2006, 05:32 AM

There are 12 notes per octave in the equal-tempered scale. Including the black ones on the keyboards of pianos, synths etc. So to get from one note to the next up, multiply by the twelth root of two (1.059463094 by my calculator). So A4 = 440. Then A#4 = 440 times 1.059463094 = 466.1637615.

There is a nice table of note frequencies here http://www.phy.mtu.edu/~suits/notefreqs.html

There are other scales beside the equal-tempered, do some googling on "musical scales" and such. It's quite fascinating.

Javachip · 6th April 2006, 07:43 AM

Excellent. Thanks for the help!

6th April 2006, 12:47 AM	#1
Javachip diyAudio Member Join Date: Dec 2005 Location: CA	Converting between Hz and octaves? Is there a conversion table or formula somewhere? Thanks.

6th April 2006, 12:57 AM	#2
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	It's not a a set conversion but rather a relative relationship. Everytime you double or halve the frequency, you cover an additional octave. So, 10 to 20Hz is an octave and also 5kHz to 10kHz is an octave. __________________ - Dan

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6th April 2006, 03:35 AM	#3
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	If you want to correlate with notes, the usual starting point is the A above middle C, at 440 Hz. From there it's a matter of doubling and halving as AudioFreak said. There may be a table somewhere, but individual notes in between the "A"s quickly start to take on awkward values with lots of places after the decimal point.

6th April 2006, 05:32 AM	#4
heater diyAudio Member Join Date: Jul 2004 Location: Helsinki	There are 12 notes per octave in the equal-tempered scale. Including the black ones on the keyboards of pianos, synths etc. So to get from one note to the next up, multiply by the twelth root of two (1.059463094 by my calculator). So A4 = 440. Then A#4 = 440 times 1.059463094 = 466.1637615. There is a nice table of note frequencies here http://www.phy.mtu.edu/~suits/notefreqs.html There are other scales beside the equal-tempered, do some googling on "musical scales" and such. It's quite fascinating. __________________ For me the past is not over yet.

6th April 2006, 07:43 AM	#5
Javachip diyAudio Member Join Date: Dec 2005 Location: CA	Excellent. Thanks for the help!

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