EQUALISATION
The response for complete equipment, (that is, the response combining both recording and playback deviations) is indicated by the DEGH of Fig. 11.8. To obtain an equalised output from this response curve it is necessary to introduce boost at both ends of the frequency range. For ideal equalisation the compensating curve must be a mirror image of the curve DEGH, so that the equalising response curve needs to be the curve IGJ.
There will be, in fact, further high-frequency losses encountered in tape recording. The tendency of the ac bias signal to act as an erasing signal during the recording process is more pronounced at high frequencies because the remanence is less deeply seated at these frequencies. Also, the physical dimensions ...
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