Oak Technology, Inc.

Arup K Bhattacharya

Sheena F Shi

Tina T Peng

Eric Jang

Chen-Chi Chou

Christopher T Brown

Chris T Brown

A method and apparatus for processing data read from a DVD media containing stored data is described. The apparatus includes a DVD media reader for reading data and error information stored on a DVD media, an error processor for determining the number of errors in the read data, and a display means for displaying the number of errors. The method includes reading actual data from a DVD media, computing a first correction code for the actual data, reading a second correction code from the DVD media, the second correction code pertaining directly to said stored data, and comparing the first and second correction codes to determine whether said actual data needs to be corrected. The method further includes determining whether the number of errors in the actual data exceeds the maximum number of errors that can be corrected, correcting the actual data if possible, counting the number of errors that are corrected, and indicating if errors in a given row or column cannot be corrected.

Method and apparatus for detecting errors in DVD data

A method of processing a DVD bitstream includes the steps of reading the DVD bitstream, the bitstream including a sync frame. A sync window is created, the sync window being open at least during the expected timing of a sync detection signal within the sync frame. The sync pattern is detected within the sync frame and the sync detection signal is generated only when the sync pattern has been detected and the sync window is open. A DVD sync pattern detection circuit includes a sync window generator to generate a sync window signal, a sync pattern detector, the sync pattern detector generating a sync detection signal only when both a sync pattern is detected in a DVD input stream and the sync window signal is asserted. A read channel bit counter generates a read counter signal to control the sync window generator, the read channel bit counter being reset when the sync pattern detector detects the sync pattern. The read channel bit counter controls the width of the sync window signals to allow the generation of correctly timed demodulation enable signals even when the sync frames have non-standard bit lengths. The sync windows also prevent the erroneous detection of sync patterns within the data portions of the sync frames. A pseudo sync detection signal is generated when the sync pattern is corrupted or missing from the sync frame.

Enabling accurate demodulation of a DVD bit stream using devices including a SYNC window generator controlled by a read channel bit counter

A method and apparatus for processing data read from a DVD media containing stored data is described. The apparatus includes a DVD media reader for reading data and error information stored on a DVD media, an error processor for determining the number of errors in the read data, and a display means for displaying the number of errors. The method includes the steps of reading actual data from a DVD media, computing a first correction code for the actual data, reading a second correction code from the DVD media, the second correction code pertaining directly to said stored data, and comparing the first and second correction codes to determine whether said actual data needs to be corrected. The method further includes the steps of determining whether the number of errors in the actual data exceeds the number of errors that can be corrected, correcting the actual data if possible, and counting the number of errors that are corrected.

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Lake Forest, CA, United States of America

Arup K Bhattacharya