Although the signal-to-noise ratio of master tape recorders is good by present standards, a low level background noise still exists. This is heard as hiss, due to the characteristic of the ear. Hiss reduction is accomplished by a new equalization that increass the tape loading in the frequencies between 1000 and 15,000 cps and decreases the hiss by 6 db as compared with NAB equalization. This is achieved at the expense of increased distortion within the hiss frequencies.
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