User Manual

A white paper issued by Siemens  September 2015

Figure 14: dB (A, C, “HDD,” Z) evaluation curves

White noise/pink noise

White noise is noise with a constant power spectral

density in a specific frequency range. White noise is per-

ceived as noise in the higher frequency range. White

noise that is limited in bandwidth is frequently used in

engineering and the natural sciences.

Pink noise, also referred to as 1/f noise, is noise that

decreases as the frequency increases. In acoustics, pink

noise is perceived as noise in which an average person

perceives all frequency ranges of the audible sound spec-

trum as equal in volume.

Figure 15: White noise/pink noise

― dB(A)

― dB(C)

― dB(HDD)

― dB(Z)

LZFmax / third octave