Low frequency issue with noise spectrum (of derivative)

1. What can cause low-frequency noise?
2. Why does differentiation increase noise?
3. Does differentiation amplify noise?
4. How low and high frequency signals are differentiated?

What can cause low-frequency noise?

Low-frequency noise is common as background noise in urban environments, and as an emission from many artificial sources: road vehicles, aircraft, industrial machinery, artillery and mining explosions, and air movement machinery including wind turbines, compressors, and ventilation or air-conditioning units.

Why does differentiation increase noise?

Another reason is that by differentiating, you remove the low-frequency components, so your eyes see mostly the high-frequency components giving you the impression of having more noise.

Does differentiation amplify noise?

It is often said that "differentiation increases the noise". That is true, but it is not the main problem.

How low and high frequency signals are differentiated?

This measurement of cycles per second is expressed in Hertz (Hz), with a higher Hz representing higher frequency sound. Low-frequency sounds are 500 Hz or lower while high-frequency waves are above 2000 Hz.