发明名称 Automatic power control system for optical disc drive and method thereof
摘要 An automatic power control system, an automatic power control method, a down sampling circuit and a down sampling method. The automatic power control system is incorporated in an optical disc drive comprising a laser diode for receiving a control signal to generate a laser beam; and a photodetector for detecting the laser beam to generate an analog input signal. The automatic power control system comprises an analog-to-digital converter, a down sampling circuit, a comparator, and a digital-to-analog converter. The analog-to-digital converter converts the analog input signal to digital data. The down sampling circuit, coupled to the analog-to-digital converter, comprises a down sampler, a counter, and a controller. The down sampler receives a predetermined amount of digital data to generate representation data. The counter, coupled to the down sampler, calculates the amount of digital data, and resets the down sampler when the amount equals or exceeds the predetermined count. The controller, coupled to the counter, disables the counter when the digital data is invalid. The comparator, coupled to the down sampling circuit, compares the representation data with predetermined target data to generate error data. The digital-to-analog converter, coupled to the comparator, converts the error data to analog to generate the control signal.
申请公布号 US8149146(B2) 申请公布日期 2012.04.03
申请号 US201113008485 申请日期 2011.01.18
申请人 HSIEH BING-YU;YU MING-JIOU;LAN KUO-JUNG;CHOU SHU-HUNG;CHEN CHIH-CHING;LIAO CHIA-WEI;MEDIATEK INC. 发明人 HSIEH BING-YU;YU MING-JIOU;LAN KUO-JUNG;CHOU SHU-HUNG;CHEN CHIH-CHING;LIAO CHIA-WEI
分类号 H03M7/00;G11B7/125 主分类号 H03M7/00
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