Include

[CrEaTrE]

C


Capacitance The property of an electric nonconductor that permits the storage of energy as a result of electric displacement when opposite surfaces of the nonconductor are maintained at a difference of potential. In a capacitor, capacitance is the measure of the property (the amount of charge that can be stored) equal to the ratio of the charge on either surface to the potential difference between the surfaces.4

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Capacitor An electronic device which stores energy and releases it when needed. Also used to direct high frequency energy to tweeters. Rated in Farads.2

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CD/MD Control The ability of a component to operate a CD or MD disc changer.3

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CD Text A compact disc and player feature utilizing disc, track, and artist information encoded directly on the CD media. Both playback and media components must have CD Text compatibility.1

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Cell A single uni8t for producing DC electricity by electromechanical or biomechanical action. A common vehicle battery is composed of a number of individual cells connected together. Each cell is typically rated at 2.11 Volts each, and a common 12VDC automotive battery is composed of 6 separate, 2 Volt cells. (Also see Battery).2

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Cell Site The middleman of the cellular system that communicates directly with the cellular telephone and relays all of the control parameters from the MTSO to the cellular telephone, as well as all requests for service from the cellular telephone to the cellular system.2

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Cellular Telephone A device consisting of a control unit, a transceiver, and an antenna which processes calls to be sent to or received from the cellular system.2

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Center-run Wire Path (Center Path Wiring) A method of running wires to the midrange/tweeter bridge in a coaxial speaker. Actual copper wire (instead of tinsel leads) are run through a hole drilled in the magnet. This offers better signal transfer and efficiency.1

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Channel (Cellular) A frequency or band of frequencies assigned to a station or communications system. Also, a sub-circuit of a larger system, i.e., voice channel, control channel, paging channel, etc.2

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Channel (Security) The term usually used to describe the number of different functions possible for manipulating the buttons on a remote control transmitter.2

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Charge Stored energy in a battery or capacitor that is discharged as electrical energy.4

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Chassis The metal frame of the vehicle.2

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Chebyshev Filter A filter that has some ripple in the pass-band but has an initial attenuation slope which is steeper than a Butterworth filter.2

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Chirp The term used to describe the brief sounding of a security system's siren designed to indicate the state of arm of the system.2

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Circuit A number of components wired together to perform an electrical function. When voltage is applied, current flows and the function is performed.4

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Circuit Breaker An electromechanical device designed to quickly break its electrical connection should a short circuit or overload occur. A circuit breaker is similar to a fuse, except it will rest itself or can be manually rest, and will again conduct electricity.2

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Class There are different classes of amplifiers, depending on how the biasing of the amplifier circuit is done.4

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Clipping The distortion that occurs when a power amplifier is overdriven. This can be seen visually on an oscilloscope, when the peaks of a waveform are flattened, or "clipped of," at the signal's ceiling.2

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Close To come together, referring to contacts in a relay or switch. When the circuit is closed, the contacts are touching, completing the circuit.4

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Closed Circuit A continuous unbroken circuit in which current can flow without interruption. Also known as a closed loop.2

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Closed Loop A feedback path in a self-regulating control system. Unlike a standard open state trigger that needs to have a connection established to serve as a trigger, a closed loop trigger will act to trigger a security system when its loop (connection) is broken.2

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Closure Wire The name given to describe a wire found on some vehicles that, when given a certain duration input, will cause the doors to lock and the windows/sunroof to close.2

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Code The aspect of a security system that can be tailored by the manufacturer or the installer to personalize the particular system for a user or group of users. A remote security system that is coded will operate only with those transmitters that are coded to the same matching code.2

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Coaxial Speaker TA coaxial speaker has a large cone for the low range, and a smaller tweeter for the high spectrum. There is a cross-over network which divides and routes the signal to the correct driver.2

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Coil A number of turns of wire around an iron core or onto a form made of insulating material. Used as an inductor, a coil offers a great deal of opposition to the passage of AC, but very little to the passage of DC. This device is good for use as a filter.4

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Co-Linear Antenna An antenna that uses a phasing coil to electrically connect stacked elements in the proper phase relationship.2

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Compliance The measurement in liters or cubic feet of the volume of air that is equal to the compliance of a speaker's total suspension.2

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Cone The most common shape for the radiating surface of a loudspeaker. Often used to refer to that part of the speaker that actually moves the air.2

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Configurable Power Supply A proprietary Sony technology for amplifiers where the power supply configuration can be changed from High Voltage mode, for superior output power driving 4 or 2 ohms, to High Current mode, for superior low impedance stability.1

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Constant Output An output of a security system that provides a constant or continuous output to drive a device. Often used for sirens and engine inteerrupts.2

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Control Unit The central processor for a security system (Also see Brain).2

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Copper Plated Chassis By bonding copper to a chassis, superior shielding is achieved, providing superior rejection of induced noise.1

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Coulomb An amount of electrical charge which contains 6.24 x 1018 of electrons.3

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Crossover A device intended to separate the different frequency bands and redirect them to different components.2

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Crossover Frequencies The frequencies at which a passive or electronic crossover network divides the audio signals, which are then routed to the appropriate speakers.2

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Crossover Network A unit which divides the audio spectrum into two or more frequency bands (Also see Crossover Frequencies).2

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Crosstalk The leakage of signal from one channel to another. Crosstalk is measured in DECIBLES as the ratio of desired signal to undesired signal; the higher the number the less the undesired signal.4

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Current The rate of electrical or electron flow through a conductor between objects of opposite charge. Symbol I, measured in amperes or amps.2

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Current-fed Antenna An antenna in which the feeder or transmission line is attached to the radiator at a current loop. This type of antenna requires a ground plane.2

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Current Sensing A name given to a form of alarm system trigger that relies on sensing a change in the power supply of the vehicle. More accurately called voltage sensing, this feature is found on many inexpensive alarm systems (Also see Voltage Sensing).2

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Custom File A feature package that provides intuitive and safe source management for an audio and A/V system. Examples include Disc Memo, Station Memo, and Memo List.1