lyöntitaajuuden

Lyöntitaajuus, often translated as strike frequency or beat frequency, is a phenomenon observed when two sound waves or other periodic signals with slightly different frequencies are combined. When these waves interact, their amplitudes do not simply add up; instead, they interfere with each other. This interference results in a noticeable periodic variation in the loudness or intensity of the combined signal.

The frequency of these variations, the lyöntitaajuus, is equal to the absolute difference between the frequencies of the original two waves. For example, if one wave has a frequency of 440 Hz and another has a frequency of 442 Hz, the lyöntitaajuus will be 2 Hz. This means the combined sound will appear to pulsate or "beat" twice per second.

This effect is commonly heard when tuning musical instruments. A musician might play a reference note and then play the string they are tuning. If the pitches are not identical, they will hear beats. As the string is adjusted to match the reference pitch, the beat frequency decreases. When the frequencies are perfectly aligned, the beats disappear, indicating the instrument is in tune. Lyöntitaajuus is a fundamental concept in acoustics and signal processing, illustrating the principle of wave interference.