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Higher Speed Duplication of Eight-Track Tapes with Enhanced Dynamic Range

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A nearly ideal focused gap field recording technique greatly reduces the problems associated with the lower speeds of the eight-track prerecorded tape cartridges for automotive use. Use of the technique essentially eliminates bias noise, reduces bias erasure or self-demagnetization loss of high frequencies to levels approaching thosse of unbiased recording, and causes only negligible amounts of thickness distortion. The technique is described and its use in ultra-high-speed duplicating equipment is explained.

JAES Volume 15 Issue 1 pp. 11-15; January 1967
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AES - Audio Engineering Society