Audiogearreviews.com Glossary
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| Alphabetical: | A-E | F-J | K-O | P-T | U-Z |
| Category: | CD Players | DVD | Video | Signal Processors | Speakers | Amplifiers | Subwoofers | Accessories |
Glossary F-J
FM
Frequency Modulation The process of varying the frequency of an RF carrier wave in accordance with the amplitude and frequency of an audio signal.
FM Presets
Memory preset for FM radio stations
Frequency
Frequency is the measurement of the number of times that a repeated event occurs per unit time. In audio, it is the number of times a speaker oscillates (cycles) per second.
Fs
The resonant frequency of a speaker (transducer) or subwoofer measured in Hz.
Gain
The ratio of the signal output of a system to the signal input of the system.
Gain Control
Adjustment device use to match the ouput of an audio device to the input sensitivity of another audio device.
Gap Height
The thickness or the top plate of a speaker (transducer) or subwoofer.
Ground
Refers to the metal chassis of the vehicle that is electrically connected to the B- of the battery. Also refers to any wiring that connects back to the B- of the battery.
Hertz (Hz)
The measurement unit of an audio frequency that is defined by the number of cycles per second. Can also be referred to as the pitch.
ILS Rating
This is the power rating technique used by manufacturers to misrepresent their products power output capability the term “ILS” refers to “If Lightning Strikes” In reality; all ratings that are not governed by the CEA-2006 standard should be carefully examined.
IM Distortion
Intermodulation Distortion. The ratio, in dB, of the total rms signal level of harmonic sum and difference distortion products, to the overall rms signal level.
Impedance
This is the total opposition to the current flow of an Alternating Current (AC) within a measured system. Measured in Ohms.
Inductance
The property of a circuit or circuit element that opposes change in current flow. This causes current changes to lag behind voltage changes. Measured in henrys.
Input Sensitivity
The range (in volts or millivolts) that a electronic device is designed to accept.
