Generating Octave Band Noise Spectra

1. How can octave bands be used in noise reduction?
2. What is octave band spectrum?
3. How are octave band frequencies calculated?

How can octave bands be used in noise reduction?

Octave Bands offer a filtering method of splitting the audible spectrum into smaller segments called octaves, allowing you to identify different noise levels across individual frequencies.

What is octave band spectrum?

An octave band is a frequency band where the highest frequency is twice the lowest frequency. For example, an octave filter with a centre frequency of 1kHz has a lower frequency of 707Hz and an upper frequency of 1.414kHz. Any frequencies below and above these limits are rejected.

How are octave band frequencies calculated?

In a general manner the middle frequencies of an n-th octave bands are obtained by successive multiplication or division of 1 000 Hz with 2^1/n. The lower and upper frequnecy bounds of a given n-th octave bands with middle frequency f_0 are given by f_0/(2^1/2)^1/n and f_0\times(2^1/2)^1/n respectively.