Gap-length response S(x) is approximated within 1% by S(x) = sin pi x/pi x, where x = 1.1 lg/lambda, lg = mechanical (optical) gap length, lambda = wavelength, and x < 0.5. Alternately, the gap length is calculated from the measured null frequency fn at the speed v; then lg = 0.8795 v/f. Gap-length response compensation is required by standards, but often neglected in practical professional reproducers. Compensation is easily achieved with an RLC -peaking- circuit.

Author: McKnight, John G.
Affiliation: Magnetic Reference Laboratory, Inc., Mountain View, CA
AES Convention: 58 (November 1977) Paper Number: 1297
Publication Date: November 1, 1977

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