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Fader - The control that adjusts the relative volume levels of front and rear speakers
in a four speaker system or the front and rear pre-amplifier outputs.
Fidelity - The term used to describe the accuracy of recording, reproduction, or
general quality of audio processing.
Filter - An active or passive circuit or device designed to block a certain frequency
or range of frequencies.
Flat Frequency Response - Term for a circuit or audio system which will pass
audio signals that will vary by no more than ± 1 dB usually between 20 Hz and 20 kHz
unless otherwise specified.
Fletcher Munson Curves - The set of curves showing the human's ear's frequency
sensitivity versus loudness, created by researchers Fletcher and Munson. The curves show
the ear to be most sensitive to sounds between 3 kHz and 4 kHz (ear canal resonances).
Floating Ground - Non-common grounding point.
Focus Lens - The lens in the optical block of a compact disc player which focuses
the laser lightonto the surface of the disc.
Focus Servo - The circuit which keeps the laser light correctly focused on the pit
area of the disc.
Frequency - The number of wavelengths which pass a specific point in a specific
time period, measured in Hertz (Hz). Cycles per second.
Frequency Modulation (FM) - The encoding of a carrier wave by variation of it's
frequency in accordance with an input signal.
FM Stereo Separation - The FM tuner demodulator's abilty to separate
left and right channel signals of FM stereo broadcast. Measured in decibels, the higher the
number the better.
Frequency Dividing Network - See
crossover network.
Frequency Response - The lowest and highest parts of the frequency spectrum
that can be reproduced by an audio component within specific limits and tolerances.
Fundamental Frequency - The principal component of a complex waveform
having the lowest frequency.
Fuse - A device that protects electric circuits by interrupting power in a circuit when
an overload occurs. Rated in amperes (amps).
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