Another name for midpoint frequency.

The midpoint of the bandpass filter passband, normally expressed as the arithmetic mean of the two -3 dB points. Also called F0 or FO.

The frequency at which the output signal from a filter reaches its highest or lowest point.

A tone control is a network of active or passive components that have uneven sensitivity across the frequency range. For example, a bass control is more sensitive to low frequencies than high frequencies with the end result being that the bass sounds louder. The tone control network is designed to have maximum effect at a certain frequency. This frequency, at the center of the affected range, is called the center frequency. A tone control can have a fixed center frequency (a conventional passive control or an EMG-SPC), or can have a tunable center frequency (such as the EMG-VMC parametric midrange control).

For a bandpass filter, the center of the transmission band, measured in a linear scale.

The arithmetic mean frequency. This is normally calculated using 3dB relative band edges (F1 & F2).Fc = (F1 + F2) / 2 Where F1 & F2 are lower and upper frequencies respectively, at which a particular signal attenuation occurs, usually taken as 3dB relative attenuation - an important parameter of bandpass and bandstop filters.

The characteristic of a band pass or band reject filter which defines its mean operating frequency. The center frequency, for a contact percentage filter, is the geometric mean of the upper and the lower cutoff frequencies.

Frequency to which an amplifier is tuned. The frequency half way between the cut-off frequencies of a tuned circuit.

One of the parameters of a bandpass filter. The center frequency occurs at the maximum or minimum amplitude response for Butterworth filters, the most common found in audio electronics.

A specified reference frequency of the crystal typically denoted in megahertz (MHz) or kilohertz (kHz).

The center frequency f0 (resonant frequency) is the geometric mean between the lower cutoff frequency f1 and the upper cutoff frequency f2 of a frequency band. See also: Band-pass filter. f2 - f1 is called the bandwidth B.