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cutoff frequency

The cutoff frequency is a characteristic value of frequency-dependent quadrupoles. This applies to passive components such as analogfilters, high-pass, low-pass and band-pass filters, but also to active components such as amplifiers, microphones or loudspeakers.

The cutoff frequency is the frequency at which the level drop is 3 dB compared to the level in a straight frequency response. This corresponds to the voltage value of 0.707 referred to the highest voltage value and thus a voltage reduction of 41%.

Frequency response of a low-pass filter

Frequency response of a low-pass filter

The cutoff frequency refers equally to the frequency at the lower -3 dB value, i.e. the lower cutoff frequency, and the upper -3 dB value, i.e. the upper cutoff frequency. The difference between the two frequencies is the bandwidth.

Informations:
Englisch: cutoff frequency
Updated at: 05.08.2017
#Words: 122
Links: frequency (f), active, level, decibel (dB), frequency response
Translations: DE
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