hljóðhæð
Hljóðhæð refers to the perceived highness or lowness of a sound, which is primarily determined by its frequency. Frequency is the rate at which a sound wave vibrates, measured in Hertz (Hz). A higher frequency corresponds to a higher-pitched sound, while a lower frequency results in a lower-pitched sound. For example, a soprano singer's voice has a higher frequency than a bass singer's voice.
The human ear can perceive a range of frequencies, typically from about 20 Hz to 20,000 Hz.
In musical contexts, hljóðhæð is fundamental to melody and harmony. Different musical notes are distinguished by