Pink noise

Pink noise is a random signal with an amplitude falloff inversely proportional to frequency. This is the most commonly employed variety noise in audio measurement, as it a constant-energy perceived content.

White noise

White noise is a random signal with constant energy across the audio range. Compared to pink noise, it sounds much brighter as it has more energy in high-frequencies. Commonly employed for electronic apparatus measurements.


Fixed-frequency, pure tone generator.


Generates a variable tone from start to end frequencies. Linear and logarithmic variants are available. Log. sweep is best suited for audio measurements as this corresponds to constant time per octave.