Method and apparatus for measuring crosstalk of optical disc
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United States of America Patent
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Mar 16, 2004
Grant Date -
N/A
app pub date -
May 11, 2000
filing date -
May 13, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for measuring the crosstalk of an optical disc of an optical disc player adapted to reproduce signals recorded on the disc, in which there are concentrically or spirally formed continuous recorded signal strings or signal recording regions and in which there is provided a positioning aperture at the center of the disc substantially concentric with said recorded signal strings or signal recording regions. A light beam is wobbled at a predetermined amplitude in the direction along the radius of the optical disc. The wobbling period is set so as to be asynchronous with the period of the optical disc rotation. The ratio between the quantity of the traverse signal obtained by the optical pickup and the quantity of strays signals is measured as crosstalk.
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