Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-11-13
1999-10-19
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 54, G11B 700
Patent
active
059700319
ABSTRACT:
A CD player system with vibration-immune uninterrupted playback capability is provided, which can keep the playback of the audio or video from an optical disc to be uninterrupted even if in the event of external vibrations causing an interrupt to the data reading operation on the optical disc due to defocusing and mistracking of the laser pickup head of the CD player system. The CD player system has a laser pickup head for reading data from an optical disc; servo circuit for controlling said laser pickup head; data processor for decoding the data from said laser pickup head; memory circuit for temporary storage of the output data from said data processor; microcontroller for controlling operations of said servo circuit and said data processor; audio reproduction components for reproducing the output data from said data processing means. Further, the data processor includes a RAM & time controller coupled to said memory unit and said microcontroller. In the event of the occurrence of a defocusing or mistracking condition to said laser pickup head, said servo circuit informs said microcontroller of such a condition, causing said mirocontroller to fetch information about which data frame is being currently written into said memory unit and then command said memory unit to discard the data frame and also command said servo circuit to resume the data reading operation by positioning the laser pickup head at the data frame that precedes the discarded data frame.
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Huang Wei-Hung
Kwong Ho-Chi
Hindi Nabil
United Microelectronics Corp.
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