## Cross-Correlation

Cross-correlation is a
mathematical operation between two signals.

From a simplified point of view it describes the similarity between two signals.
In the area of audio measurement it is widely used to judge stereo signals.
WinAudioMLS displays the magnitude of the cross-correlation over frequency. For
a mono signal, left and right channel are identical. In this case the display of
the cross-correlation shows the squared spectrum of the input signal. Two independent
signals have low correlation. They are uncorrelated. In a real stereo signal,
there are visible correlations depending on the signal. Typically voices or
vocals are mixed to the virtual center. In this frequency range you will see
clear correlations.

**SQRT
correlation
**

Die SQRT correlation is
similar to the normal cross-correlation. The only difference is, that the square
root (SQRT) is computed before displaying the data. For a mono signal you will
monitor the power spectrum of the signal instead of the squared one.

**Correlometer
**

The correlometer performs
a special normalization. If both signals are identical 0dB is displayed. This
type of display allows to monitor differences between the two channels easily.
Pure level differences are automatically recognized and removed. This means that
are balance change does not modify the display.

**Note**:
You can easily monitor all correlation results over time by using the
spectrogram display.