# Zero and pole of transfer function spaced for one octave

Find ratio R1/R2 so that zero and pole of transfer function are spaced for one octave.

I found zero and pole, but what "spaced for one octave" means?

• Did you consider looking up octave on Wiki before asking this question? – The Photon Oct 5 '15 at 16:10
• Sure, but although I know definition, I don't know how to apply it in this problem. – hari Oct 5 '15 at 16:14

If two frequencies $f_1$ and $f_2$ are spaced by an octave then either
$$\frac{f_1}{f_2} = 2$$
$$\frac{f_1}{f_2} = \frac{1}{2}$$