Apparatus for playing back data read out of data tracks on a recorded medium
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United States of America Patent
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-
Sep 17, 1991
Grant Date -
N/A
app pub date -
Sep 28, 1988
filing date -
Sep 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An arrangement for playing back data read out of data tracks on a recorded medium, in which a tracking circuit positions a beam of light on data tracks of the recorded medium. From a photodetector with a plurality of photodiodes, there are generated a data signal, a focusing-error signal, and a tracking-error signal. These signals result from the beam of light that is reflected by the recorded medium onto the photodetector. An offset-compensation voltage is applied to one input of a tracking control amplifier in the tracking circuit. The tracking error signal is generated from photovoltages of predetermined ones of photodiodes. The offset-compensation voltage is varied until one of the photovoltages is equal to the sum of the offset-compensation voltage and of another one of the photovoltages to maintain the operating point of the tracking circuit at an optimal midpoint.
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