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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. |
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Farad - The basic unit of capacitance. A capacitor has
a value of one farad when it can store one coulomb of charge with
one volt across it. |
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Fidelity - The term used to describe the accuracy of
recording, reproduction, or general quality of audio processing. |
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Filter - An active or passive circuit or device designed
to block a certain frequency or range of frequencies. |
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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. |
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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). |
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Floating Ground - Non-common grounding point. |
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FM Stereo Separation - The FM tuner demodulator's ability
to separate left and right channel signals of FM stereo broadcast.
Measured in decibels, the higher the number the better. |
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Focus Lens - The lens in the optical block of a compact
disc player which focuses the laser light onto the surface of
the disc. |
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Focus Servo - The circuit which keeps the laser light
correctly focused on the pit area of the disc. |
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Frequency - The number of wavelengths which pass a specific
point in a specific time period, measured in Hertz (Hz). Cycles
per second. |
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Frequency Dividing Network - See crossover network. |
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Frequency Modulation (FM) - The encoding of a carrier
wave by variation of it's frequency in accordance with an input
signal. |
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Frequency Response - The lowest and highest parts of
the frequency spectrum that can be reproduced by an audio component
within specific limits and tolerances. |
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Fundamental Frequency - The principal component of a
complex waveform having the lowest frequency. |
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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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