Visual Analyser  - "Settings window"

Spectrum

Introduction

"Spectrum" is the window in which you'll find all the settings for the spectrum analyser window. In the commad bar of the spectrum analyser window itself  (only when in floating mode) there are a subset of this options for simplicity of use. The "Phase Threshold" trackbar is related to the phase window, but it has been reported here for two reason: (1) because the phase window is strictly related with the spectrum window, in fact a true spectrum is, by definition, composed of an amplitude & phase spectrum. (2) It is the only command related to the phase window, and so there is no reason dedicating it an entire window.

Spectrum window scale setting 

Step Y scale

Allows to select the high of the step of Y scale when in dB scale.

X-axis

Here is the philosophy of the spectrum graphic windows. In short, you can select the X-scale of the X-axis of the spectrum window. In more detail, the points of the spectrum are always power of two. That is, 128, 256, 512 etc (see help on setting/main). The idea is to fit exactly harmonic value and pixel. So, the minimum width of the spectrum window has been estabilished to be 512 pixel. In this way, for each definition of the spectrum (512, 1024  ...etc) you have always a even number of harmonics for pixel like 1,2,4,8 ...2*n; if the number of harmonics is less than 512 than you have always a even (2*n) number but in inverse way: that is one harmonic for two pixel, two harmonic for four pixel etc. In other world, no strange division as 1.3 harmonic for pixel...In this way, there is always a clear corrispondence between harmonic and pixel on the screen