Wavetek 147 Specifikace stáhnout pdf (Strana 389)

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Appendix E

Glossary

This glossary covers terminology used in the manual, as well as other terms,

that will help to clarify discussion and procedures in the manual. Sources

include Acterna proprietary documents; the Jones Dictionary for Cable

Television and Information Infrastructure, 4th Edition; and the IEEE Standard

Dictionary of Electrical and Electronic Terms, 4th Edition, and other

electronics authorities.

Analogue-VSB Vestigial Sideband Modulation: prescribed partial

suppression of one of the sidebands. This technique uses less bandwidth

than double sideband transmission, and preserves the signal’s waveform.

Amplitude Modulation Amplitude of the high-frequency carrier varies

according to the instantaneous value of the low-frequency modulating signal.

Baseband The band of frequencies occupied by the signal in a carrier

before the signal is modulated in the carrier to form the transmitted signal.

BPF Band Pass Filter

Bursty Data streams that are sporadic: bursts of data transmission

interspersed with periods of little or no activity.

BW Bandwidth: A measure of information-carrying capacity of a

communications channel. BW is the difference between the highest and

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