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Design of a Noise Eliminator System

A system of compression before recording and expansion upon playback has been developed to extend the dynamic range of a studio tape machine up to 110 dB. Accurate reconstruction of the signal independent of the tape recorder gain results from the use of a wideband cube root compression characteristic in conjunction with high and low frequency preemphasis. Three variations of the preemphasis-compression characteristic are optimized respectively for 15 ips, 7 1/2 ips, and for the production of consumer tapes, records, and FM programs. While intended to be played through an expander the consumer program material is also compatible with conventional equipment. This paper will discuss system characteristics and design.

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