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	Automatic power control system for optical disc drive and method thereof
	HSIEH, BING-YU; YU, MING-JIOU; LAN, KUO-JUNG; CHOU, SHU-HUNG; CHEN, CHIH-CHING; LIAO, CHIA-WEI
	2007-12-06
著作权人	MEDIATEK INC.
专利号	US20070279274A1
国家	美国
文献子类	发明申请
其他题名	Automatic power control system for optical disc drive and method thereof
英文摘要	An automatic power control system, 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.
公开日期	2007-12-06
申请日期	2007-06-05
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58073]
专题	半导体激光器专利数据库
作者单位	MEDIATEK INC.
推荐引用方式 GB/T 7714	HSIEH, BING-YU,YU, MING-JIOU,LAN, KUO-JUNG,et al. Automatic power control system for optical disc drive and method thereof. US20070279274A1. 2007-12-06.

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