Octave and Third Octave Spectrum

An octave or third octave spectrum is a way of analyzing the energy content of a signal within specific frequency bands (see Octave and Third Octave Bands).

SAS calculates the level within these bands from the temporal signal according to the ANSI S1.1-1986 and IEC 61260 (1995-08) standards.

Note: In SAS, the digital filters used by the Equalizer are not the same as the filters used for the 1/3 octave levels calculation. See Signal Equalization for more information.

Refer to the Display Options for the Spectrum Window to learn how to display octave and third octave levels.