Fast Fourier Transform Anazlyzer - Vox -01 Operating Manual

Fast Fourier Transform Analyzer
The FFT module allows you to perform spectral analyses with a much higher frequency
resolution that the RTA module. This is very useful if you are looking to identify the exact
frequency and level of certain signal components, or if you want to study the harmonic
structure of sounds.
The maximum frequency resolution of the FFT analysis, with supported window sizes of
up to 32768 samples, approaches 1 Hz. This means that the analysis contains more data
and more detail than can be shown on the display at once. In order to deal with this, the
FFT module features a zoom function to zoom in on part of the spectrum. Also, the full
details of every measurement can be retrieved through USB by saving measurements.
FFT measurement screen
The general "look and feel" of the measurement screen is similar to the RTA module, but
with a few differences. First of all, in line with the normal conventions, frequency weight-
ings are not supported by the FFT module. Secondly, a button at the top right-hand
side of the graph can be tapped to reveal a small keyboard with zooming options:
These controls are used to zoom in or zoom out along the frequency axis, and to center
the display around the current cursor position. By pressing "hide" the zoom controls are
collapsed again. The zoom controls are used together with the cursor to focus on any region
of interest in the spectrum.. The cursor, shown as a vertical red line, can be moved by
tapping the arrows below the frequency axis or by tapping directly on the graph.
18 VOX -01 Operating Manual