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Frequency Axis Scaling
There are two basic types of frequency axis scaling: Narrowband and Octave. Narrowband scaling can be displayed in either Linear or Logarithmic format; Octave scaling is always displayed in Logarithmic format.
Narrowband Scaling
The spectrum produced by an FFT algorithm is also known as a narrowband spectrum. Each spectral line is a constant bandwidth and typically quite narrow. This narrowband spectral data can be displayed on either a linear or logarithmic scale but the frequency resolution is determined by the sampling rate and FFT size and remains unchanged.
Octave Scaling
Octave scaling produces a set of bands with constant proportional bandwidth. You can select from a range of octave formats. 1/1 and 1/3 octave are the most commonly used formats. See the Octave Scaling topic for more details.
See Also: Amplitude Axis Scaling, Scaling