The interval between two sounds having a basic frequency ratio of two. By extension, the octave is the interval [sic] between any two frequencies having the ratio 2:1. The standard octave bands are:

FREQUENCY (CPS)

Mid-Frequency 63 125 250 500 1000 2000 4000 8000

Approximate Lower 45 90 180 355 710 1400 2800 5600

Frequency

Limits Upper 90 180 355 710 1400 2800 5600 11120

### OCTAVE

Labels: 1 1968 Building Code, O