Necessary bandwidth
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4-1-065
For a given class of emission, the minimum value of the occupied bandwidth sufficient to ensure the transmission of information at the rate and with the quality required for the system employed, under specified conditions. Emission useful for the good functioning of the receiving equipment as, for example, the emission corresponding to the carrier of reduced carrier systems, shall be included in the necessary bandwidth.
Reference: I.T.U.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
