Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Reexamination Certificate
2006-12-05
2006-12-05
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
C318S629000, C360S077040, C369S044320, C369S053140
Reexamination Certificate
active
07145304
ABSTRACT:
An adaptive feed forward controller inserts signals into control loops of an optical disc player and/or recorder at a frequency of the rotation of the disc and one or more harmonics thereof, while at the same time maintaining the stability of the control loops. This makes the control loops more responsive to harmonic components of eccentric and/or tilt motion of a track being followed, a characteristic of poor quality optical discs. The quality of playback or recording such discs is thereby improved. Signal processing forming the control loops including the adaptive feed forward controller is carried out by a software controlled processor on an integrated circuit chip within the optical disc instrument. A signal representing the frequency of rotation of the disc, which is used in the signal processing, can be derived from the control loop rather than by directly measuring rotation with a transducer in the rotating system.
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Jodorkovsky Mario
Mandel Yehonatan
Margalit Assaf
Parsons Hsue & de Runtz LLP
Ro Bentsu
Zoran Corporation
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