Laser recording information and pilot signals for tracking on a grooveless recording
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United States of America Patent
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Sep 13, 1983
Issued Date -
N/A
app pub date -
Jul 8, 1981
filing date -
Apr 8, 1976
priority date (Note) -
Expired
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Abstract
An information signal recording system records an information signal, a first and a second reference signals for tracking control, and a third reference signal for switching the first and second reference signals at the time of reproduction on a recording disc. The first and second reference signals of different frequencies are alternately recorded on intermediate parts of the recording disc, at positions between centerlines of adjacent information signal tracks. The third reference signal of a still different frequency is recorded at a predetermined position on every information signal track. A reproducing system reproduces the information signal together with the third reference, and the first and second reference signals by a single reproducing element. A tracking control signal is produced from the first and second reference signals switched by the third reference signal separated from the reproduced information signal.
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