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Here is my task:

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

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

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    \$\begingroup\$ Did you consider looking up octave on Wiki before asking this question? \$\endgroup\$ – The Photon Oct 5 '15 at 16:10
  • \$\begingroup\$ Sure, but although I know definition, I don't know how to apply it in this problem. \$\endgroup\$ – hari Oct 5 '15 at 16:14
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An octave is a factor of 2 in frequency.

If two frequencies \$f_1\$ and \$f_2\$ are spaced by an octave then either

$$\frac{f_1}{f_2} = 2$$

or

$$\frac{f_1}{f_2} = \frac{1}{2}$$

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