G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/09 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1193723
ABSTRACT: "Apparatus for optically scanning a disc-shaped record carrier." An apparatus for optically reading a disc- shaped record carrier, which apparatus comprises a radial tracking control system which employs a radial error signal obtained by comparing two signals supplied by two radially adjacent detectors. In order to stabilize the loop gain of the control loop thus formed at a constant value, a measuring signal of predetermined frequency is injected into the control loop and the response of the control loop to said injected signalis compared with the injected signal, which comparison results in a control signal for a controllable amplifier circuit. Suitably, said comparison is a phase comparison. The injected mea- suring signal causes the scanning beam to oscillate relative to the track to be followed. By measuring the correlation between said oscillation signal and the amplitude of the information signal being read, a signal can be obtained which is a measure of deviations, not caused by tracking errors, between the signals supplied by the two detectors and which may be used for correction purposes.
416404
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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