G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/00 (2006.01) G11B 21/02 (2006.01) G11B 21/04 (2006.01) G11B 21/08 (2006.01) G11B 21/10 (2006.01)
Patent
CA 1177955
ABSTRACT OF THE DISCLOSURE A rotary recording medium reproducing apparatus reproduces a rotary recording medium having at least one surface which has a spiral main track comprising a multiplicity of successively adjacent track turns, and a reference signal track disposed between center lines of mutually adjacent track turns of the main track, wherein the surface of the rotary recording medium comprises at least one information part comprising track turns of the main track having an information signal recorded thereon, where first and second reference signals are alternately recorded in the radial direction of the rotary recording medium on the reference signal track, and a third reference signal is recorded at positions where track turn numbers change for every revolution of the rotary recording medium, and at least one predetermined region in which one of the first, second, and third reference signals is recorded with an existence period longer than that at other normal regions, for one track turn. The rotary recording medium reproducing apparatus comprises a reproducing tracing element for reproducing a signal from the rotary recording medium, a comparing circuit for comparing level differences between first and second reference signals reproduced by the reproducing tracing element, to produce an output control signal, a switching circuit for switching the reproduced first and second reference signals in response to a third reference signal reproduced by the reproducing tracing element, and for supplying the signals thus switched to the comparing circuit, a tracking control circuit supplied with the output control signal, for controlling the tracking of the reproducing tracing element, a discriminating circuit for discriminating the reference signal which is recorded in the predetermined region with an existence period longer than that at other normal regions, for one track turn, and reproduced by the reproducing tracing element, and a feed control circuit for controlling feeding of the reproducing tracing element by an output of the discriminating circuit.
397082
Hirata Atsumi
Takahashi Nobuaki
Marks & Clerk
Victor Company Of Japan Ltd.
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