Graphs

The graphs window displays the result of the decomposition of oscillation frequencies.

The graphs can be selected on the upper bar of the window and are as follows:

• FFT Right / Left
• FFT Anterior / Posterior
• Right / Left Oscillation
• Anterior / Posterior Oscillation

FFT

FFT stands for Fast Fourier Transform.

In the specific case of base balance, FFT allows decomposing the oscillations of the patient into components of frequencies and amplitudes.

The decomposition is performed on the two axes:

• right / left
• anterior / posterior

FFT graphs

FFT graphs display the amplitudes on the Y-axis and the frequencies on the X-axis.

Frequencies are plotted on a natural logarithmic scale.

Example of FFT graph for the frequencies of right / left oscillation:

Fundamental frequency

It is the frequency with the largest amplitude; in the example, the oscillation frequency in the right / left  direction with the largest amplitude has a value of 0.6 Hertz.

See also: numeric values.

Oscillation graphs

Patient's oscillations are decomposed on the two axes:

• right / left
• anterior / posterior

and are displayed in two different graphs where amplitude is plotted on the Y-axis and the time in seconds is displayed on the X-axis.

Example of graph for the anterior / posterior oscillation:

Manual GPS 5, version 1.0.5 release date:14-01-2011    Copyright © 2011 Chinesport