For the curious or technically minded among you, the SDC curves are calculated in this way:
a) The track is split up into a number of frequency bands, each 1/6th of an octave wide
b) The signal levels of each band are measured, throughout the full track
c) The signal levels for each band are then divided up into the time-percentage ranges and the level below which the signal is, for example 50% of the time, is found (4th curve from the top)
d) The calculations are repeated for the other five percentages
e) The results are displayed as the six Spectral Dynamic Contour curves
For example, curve 4 shows what level the signal below for 50% of the time, for each frequency.
Specifically, the six SDC curves show the level percentiles at each frequency as follows:
1. 100% (maximum level)
2. 98%
3. 83%
4. 50% (median)
5. 21%
6. 8% (softest level)
The percentage values have been carefully and intelligently chosen to show equal and usefully-spaced contour curves in the SDC, suitable for many genres of music.
Signals below the 8% percentile bottom curve are usually not relevant for typical music mastering applications.
The top curve at 100% should be regarded as the highest level reached during the full track, in each frequency band.
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