Transmission of television signals over long systems requires a fine degree of equalization. An adjustable type of equalizer to supplement fixed equalizers is discussed. It provides both gain and delay characteristics in the form of harmonically related cosine shapes which are independently adjustable. The design and operation of the equalizer is explained on the basis of paired echo theory. The 336A equalizer used in the L3 coaxial system is discussed as an example of this equalization technique.
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Sperry et al. (1960) studied this question.
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