Niederfrequenz

Niederfrequenz is a German term that refers to the lower end of a frequency spectrum. It is not a rigid scientific category, but a contextual label used in different fields to distinguish the low-frequency range from mid and high frequencies.

In acoustics and audio, Niederfrequenz describes the low end of sound, including bass and infrasonic components. Human hearing generally begins around 20 Hz, but energy below this threshold can be significant in music production, room acoustics, and sub-bass systems. Frequencies in this range are particularly affected by room modes and environmental influences.

In radio engineering and electromagnetism, Niederfrequenz often denotes the lower portions of the radio spectrum, especially the LF (low frequency) and MF (medium frequency) bands. These bands typically span from tens of kilohertz up to a few megahertz and are used for long-range communication and navigation. Their propagation characteristics differ from higher-frequency bands, with greater ground-wave reach and different atmospheric interactions.

In electrical power and vibration contexts, Niederfrequenz can refer to signals or phenomena at the lower end of the spectrum, such as 50/60 Hz power system fundamentals or subharmonics. Such low-frequency content can influence structural vibrations, noise, and interference in equipment.

Measurement and technology for Niederfrequenz require sensors and processing capable of extended low-frequency response, including microphones, accelerometers, and seismometers. The exact boundaries of Niederfrequenz are context-dependent and vary by discipline, making it a flexible descriptor rather than a fixed category.