Measurements of recorded level and channel separation using standard optical methods or by means of phonograph cartridges yield only approximate values. In the case of cartridge measurements, groove deformation as well as cartridge crosstalk characteristics further influence the results. A technique using dual-beam interferometry to yield high orders of accuracy in determining recorded levels and channel separation in stereo discs is described.

Authors: Inoue, T.; Owaki, I.; Ohba, K.; Nakamura, S.; Eargle, John
Affiliations: Victor Company of Japan, Tokyo, Japan ; JME Associates, Los Angeles, CA(See document for exact affiliation information.)
JAES Volume 22 Issue 9 pp. 704-705; November 1974
Publication Date: November 1, 1974

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