Matsushita Electric Industrial Co., Ltd.

Noriyuki Manabe

Hiroshi Sakamoto

Fumio Sumi

Yoshiyuki Iwamura

The optical disk controller of this invention that reduces the frequency of output of status reports to relieve the burden of a system controller includes: a status generator for generating status reports each representing the operation state of the optical disk controller every sector of a disk; and a status sampling section for sampling the status reports at a set sampling interval. When a generated status report matches with 'sampling abort' status stored in a sampling category storing portion, status sampling is aborted.

Optical disk controller which sets sampling interval according to rotational speed of optical disk

In modifying a program fixedly recorded in a ROM or the like, desired positions in the program can be modified with a little hardware. In order to achieve the object, the program modification device comprises the modifying address register which stores the addresses of program data to be modified prior to the execution of the data and the modifying address storage table which stores all the addresses of the modification source programs to be loaded to the modifying address register and all the addresses of the modification target programs in pairs, and further comprises a modification target program having instructions embedded therein so as to load necessary information from the modifying address storage table to the modifying address register before the program to be modified is executed.

Program modification device

The demodulated signal from the optical disk, containing a plurality of addresses is supplied to the address decoder which sets error detection flags when address decoding fails. If all addresses fail to decode, an address interpolator performs address interpolation up to a stored maximum number of iterations, thereby allowing data to be continuously read out from the demodulated signal. The maximum number is stored in memory. If at least one address is decoded, the address interpolator selectively updates the stored maximum number to achieve higher performance in reproducing data items from the optical disk.

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Osaka, Japan

Noriyuki Manabe