Any component, usually electronic and having known input and output, that can be readily inserted into or removed from a specific place in a larger system without knowledge of the component's detailed internal structure.



Related Terms

FEEDBACK CIRCUIT

A circuit that returns a portion of the output signal of an electronic circuit or control system to the input of the circuit or system.

ELECTRONIC CHART DISPLAY AND INFORMATION SYSTEM

An electronic chart system which complies with IMO guidelines and is the legal equivalent of a paper chart.

CIRCUITRY

The complete combination of circuits used in an electrical or electronic system or piece of equipment.

INPUT

Information put into a communication system for transmission or into a computer system for processing; a position, terminal, or station at which input enters a system.

WORLD GEODETIC SYSTEM

A consistent set of parameters describing the size and shape of the earth, the positions of a network of points with respect to the center of mass of the earth, transformations from major geodetic datums, and the potential of the earth (usually in terms of harmonic coefficients). It forms the common geodetic reference system for modern charts on which positions from electronic navigation systems can be plotted directly without correction.

CURRENT MIRROR

An electronic circuit that generates, at a high-impedance output node, an inflowing or outflowing current that is a scaled replica of an input current flowing into or out of a low-impedance input node.

DIODELOGIC

An electronic circuit using current-steering diodes, such that the relations between input and output voltages correspond to AND or OR logic functions.

ECS

Electronic Chart System

DISTORTION

  1. Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium. 2. In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output. 3. Any undesired change in the waveform of a sound wave.

COMPUTER-CONTROLLED SYSTEM

A feedback control system in which a computer operates on both the input signal and the feedback signal to effect control.

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