Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1982-04-21
1984-06-19
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 55, G11B 344, G11B 906, G11B 2700, H04N 576
Patent
active
044556330
ABSTRACT:
An electromechanical cutting stylus is used in a system for mastering video disc recordings in a metal substrate. The cutting stylus introduces signal distortions and errors into the mastering process such that the quality of the reproduced signal displayed on a television receiver is affected. A non-linear optical system, i.e., a Michelson interferometer, is incorporated to measure the non-linearities introduced by the recording process. The non-linear effects of the optical measuring system may be eliminated or reduced by choosing cardinal operating points for measuring the recording non-linearities. In accordance with one technique the cardinal operating points may be chosen by the steps of utilizing a special test signal which comprises the sum of a high level test signal and a low level pilot signal, analyzing the output of the non-linear optical system, and choosing the cardinal operating points based upon the spectral content of the output of the optical system including the amplitudes of the high level test signal, the low level pilot signal and spurious components thereof.
REFERENCES:
patent: 3842194 (1974-10-01), Clemens
patent: 4044379 (1977-08-01), Halter
patent: 4060831 (1976-10-01), Halter
patent: 4155098 (1979-05-01), Roach et al.
patent: 4363118 (1982-12-01), Roach et al.
RCA Corporation
Richardson Robert L.
Roehling J. E.
Tripoli J. S.
Whitacre E. M.
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