Lågfrekventa

Lågfrekventa is an adjective used in Swedish to describe phenomena, signals, or system components characterized by relatively low frequencies. The exact threshold depends on context, but the term is commonly applied where the relevant frequency content lies at the lower end of the spectrum compared with mid- or high-frequency domains.

In acoustics and music, lågfrekventa ljud refer to bass and sub-bass sounds. The audible bass range generally extends from about 20 Hz to a few hundred hertz, with sub-bass below roughly 60 Hz. Low frequencies are felt as vibrations as well as heard as tone rather than pitched musical notes. Infrasound, below 20 Hz, is typically not heard by humans but can be detected by sensors or felt in environments with strong sources such as storms or geological activity.

In radio communications, the term is used for the low-frequency or LF portion of the spectrum, typically 30 kHz to 300 kHz. LF signals propagate primarily as ground waves and can cover long distances without repeaters; they have special uses such as navigation beacons and time-signaling transmissions.

In electronics and signal processing, lågfrekventa describes signals with low angular frequency. Circuits designed for low-frequency operation feature long time constants and are less sensitive to high-frequency noise; DC signals (0 Hz) lie at the theoretical lower limit of the spectrum.

The concept is widely used across disciplines to categorize phenomena by frequency, with practical boundaries varying with application.