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Mobile Electronics Glossary of Terms and Definitions - F

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mobile Electronics Glossary - F
  F3 - -3 dB cutoff frequency, in Hz
  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.
  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.
  Fb - Enclosure resonance (usually for bass reflex systems), in Hz
  Fc - System resonance (usually for sealed box systems), in Hz
  FCC - Federal Communication Commission. The U.S. government agency which oversees and regulates electronic communication.
  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.
  Fixed DIN Mount - A DIN headunit mounting system whereby no part or component is removeable for security purposes
  FL Backlight - Fluorescent illumination for the lighted portion of a liquid crystal display. Considered to be a step-up feature from EL backlight.
  Flashing Lights - A term used to describe the interfacing of the vehicle's parking lights, dome light, emergency lights, etc., with a security system so that the lights flash by the security system.
  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.
  Flux - The flow of magnetic energy in a circuit.
  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.
  Focus Lens - The lens in the optical block of a compact disc player which focuses the laser light onto the surface of the disc.
  Focus Servo - The circuit which keeps the laser light correctly focused on the pit area of the disc.
  Free Air Response - The frequency at which a speaker will naturally resonate.
  Frequency - The number of wavelengths which pass a specific point in a specific time period, measured in Hertz (Hz). Cycles per second.
  Frequency Dividing Network - See crossover network.
  Frequency Modulation (FM) - The encoding of a carrier wave by variation of it's frequency in accordance with an input signal.
  Frequency Response - The lowest and highest parts of the frequency spectrum that can be reproduced by an audio component within specific limits and tolerances.
  Fs - Driver free air resonance, in Hz. This is the point at which driver impedance is maximum. "This parameter is the free-air resonant frequency of a speaker. Simply stated, it is the point at which the weight of the moving parts of the speaker becomes balanced with the force of the speaker suspension when in motion. If you've ever seen a piece of string start humming uncontrollably in the wind, you have seen the effect of reaching a resonant frequency. It is important to know this information so that you can prevent your enclosure from 'ringing'. With a loudspeaker, the mass of the moving parts, and the stiffness of the suspension (surround and spider) are the key elements that affect the resonant frequency. As a general rule of thumb, a lower Fs indicates a woofer that would be better for low-frequency reproduction than a woofer with a higher Fs. This is not always the case though, because other parameters affect the ultimate performance as well."
  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).
  Fusible Link - Designed to perform the same task as a fuse, but the resembles a wire. Fusible links are commonly used in ignition switches and other high current circuits.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mobile Electronics Basics:
Diodes
Glossary of Terms and Definitions
Ohm's Law
Recommended Books & DVD's
Recommended Wire Sizes
Relays
Resistors
Tools and Equipment


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