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A New Equalization Characteristic for Master Tape Recording

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Master tape recorders, running at 15 inches per second and using NAB equalization, are capable of providing a 55 db signal to noise ratio (peak record level to unweighted noise). Existing disc recording techniques had improved to a point where the audible master tape hiss became objectionable, especially during low level program material. An investigation of this problem resulted in a new equalization that reduces the hiss by 6 db. This work was done prior to the disclosure of the Ampex Master Equalization (AME).* It is gratifying to note the agreement in broad areas between Ampex and CBS data.

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