Industrial Technology Research Institute

Ching-Ping Kuei

Kuang-Yang Chuang

Feng-Hsiang Lo

King Yin Wang

Kuo-Ding Shin

Shuh-Tai Lu

Jyh-Shong Ju

Yong-Long Lee

Shu-Tai Lu

This specification discloses an automatic calibration method for the output power of a pickup head for an optical information recording apparatus, which avoids laser diode thermal effects using duty cycle control and obtains the correct conversion function between the output current of a front monitor diode and the output power of the pickup head by curve fitting. This method only needs to measure one set of front monitor diode output current and output power conversion function of the pickup head. The same conversion function is applicable to all pickup heads of the same type. The optical information recording apparatus automatically detects the corresponding parameter for the pickup head. Each optical information recording apparatus can also automatically detect the specific power control parameters for each set of power control channel to obtain the optimal recording characteristics.

Automatic calibration of the output power of a pickup head for an optical information recording apparatus

The present invention relates to an apparatus and method for analyzing the read-out signal of an optical storage media and is especially suitable for the HF signal read from the digital video disk (DVD), wherein the HF signal comprises many different signals whose periods are integer times of the system period. The present apparatus can be used to record the maximum or minimum values of specific period of signals for further statistical analyses. Furthermore, the AC and DC components of the HF signal can be processed independently and the results will be combined together for further processes. Therefore, it only takes moderate memory capacity and acquisition time to obtain accurate maximum or minimum values of the specific period of signals.

Apparatus and method for analyzing the read-out signal of an optical storage media

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Taoyuan, Taiwan

Ching-Ping Kuei