Method and device for determining the frequency distribution of the signal levels of a measured signal measured in overlapping observation intervals

A device for determining a frequency distribution of a signal level of a measured signal measured respectively in overlapping observation intervals via a time or frequency raster, said device comprising:

• a first, second and third memory of which the individual memory cells contain the number of signal levels of the measured signal measured in associated signal-level ranges and at associated values of the time or frequency raster, which is incremented respectively in measurement cycles of the observation interval, wherein the memory cells of the second memory contain an un-delayed number of measured signal levels of the measured signal, the memory cells of the third memory contain respectively a delayed number of measured signal levels of the measured signal, and the memory cells of the first memory contain the difference between the un-delayed and the delayed number of measured signal levels;
• a delaying unit connected upstream of the third memory in order to delay the un-delayed number of measured signal levels of the measured signal;
• and
• a subtraction unit connected downstream of the second and third memories and upstream of the first memory in order to subtract the delayed number of measured signal levels from the un-delayed number of measured signal levels.