> ## Documentation Index
> Fetch the complete documentation index at: https://amethyst.geoxor.moe/llms.txt
> Use this file to discover all available pages before exploring further.

# Vectorscope

A [vectorscope](https://en.wikipedia.org/wiki/Vectorscope) is a useful visualization tool that plots the amplitude of a [stereo](https://en.wikipedia.org/wiki/Stereophonic_sound) signal in a [two-dimensional](https://en.wikipedia.org/wiki/2D_computer_graphics) [X-Y graph](https://en.wikipedia.org/wiki/Oscilloscope#X-Y_mode), with
X being channel one horizontally and Y being channel two vertically, thus revealing the relationship between the two signals ([correlation](#correlation)).

## Real-Time Analysis

The vectorscope operates in real time, using the [Fast Fourier Transform (FFT)](https://en.wikipedia.org/wiki/Fast_Fourier_transform) to break down the signal into its constituent frequencies and plot their levels instantly.

<Info>The FFT size can be changed in `Settings` > `Metering` > `Vectorscope` > `FFT Size`</Info>

## Simplification

Simply put, the vectorscope shows how "wide" or "stereo" the signal is.

## Correlation

[Correlation](https://www.beis.de/Elektronik/Correlation/CorrelationCorrectAndWrong.html#:~:text=Audio%20Correlation%20Measurement%20Basics\&text=In%20our%20case%20correlation%20means,levels%20may%20be%20completely%20different) is an arbitrary value that defines how 'similar' the two signals are, meaning a stereo signal of an identical set of [sinewaves](https://en.wikipedia.org/wiki/Sine_wave)
with synchronized [phases](https://en.wikipedia.org/wiki/Phase_\(waves\)) would result in a correlation value of `+1`, whereas a signal with one of the [phases](https://en.wikipedia.org/wiki/Phase_\(waves\)) inverted (180°) would result in a correlation of `-1`.

Visually we can understand what the vectorscope is showing us by understanding that when the lines are mostly vertical we have a correlation near `+1` versus when the lines are horizontal which means we are near `-1`.