The Relationship Between The NCTA, EIA, And CCIR Definitions Of Signal-To-Noise Ratio (1974)
By T. M. Straus, Theta-Com of California
One might think that such a common term as signal-to-noise ratio has only one definition, but this is unfortunately not the case. The definition depends upon what is meant by 11 signal" and what is meant by "noise" and these meanings determine how the measurement is made. To compare an NCTA SIN measurement made at VHF with an EIA or CCIR S/N measurement made at video baseband one must follow the vestigial sideband television signal through an ideal vestigial sideband demodulator. The resulting relationships show that there is only a small difference between the various definitions. Experimental results which back up the theoretical findings are described.
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