Tag Archives | Telecommunications

A-NUMBER

the number of the phone from which the call has been made in one perceptive network.

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ABSOLUTE WAVEMETER

Device which measures frequency of injected radio-frequency voltage by observing the length of a resonant line.

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ACKNOWLEDGEMENT SIGNAL

Signal transmitted from a point B to point A in a circuit, when triggered by a signal from a point A to a point B.

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ACOUSTIC DELAY LINE

A delay line, also known as sonic delay line, based on the time of propagation of sound waves.

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ACOUSTIC FEEDBACK

Positive feedback which occurs when a sound loop exists between an audio input and an audio output.

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ACOUSTO-OPTIC MODULATOR

A device used to diffract and shift the frequency of light using sound waves. It operates via acousto-optic effect.

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ACTIVE TRANSDUCER

Device which generate electric current or voltage directly in response to stimulation, such as thermocouple.

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ADAPTIVE DIFFERENTIAL PULSE CODE MODULATION

A variant of differential pulse-code modulation which allows further reduction of the required bandwidth for a given signal-to-noise ratio.

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ADCOCK ANTENNA

An antenna array that consists of four equidistant vertical elements which transmit or receive directional radio waves.

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ADD-DROP MULTIPLEXER

An important element of an optical fiber network which combines several lower-bandwidth streams of data into a single beam of light.

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