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第四部分尽管CD已作为近似于完美无缺的音频器件而兜售,然而其音质水平却是以很大代价(唱机的复杂)换来的。本文的前三部分,已分析了控制唱机机械操作的4种CD伺服系统。若唱机要能从CD表面重现数据,则主轴、跟踪、径向/横向和聚焦伺服系统必须正常运行。数据重现数据重现过程通常称为8～14比特调制(EFM)检波。激光束被反射回光电二极管阵后,
Part IV Although CDs have been marketed as sound devices that are nearly perfect, their sound quality is traded back at a great price (the sophistication of record players). The first three sections of this article have analyzed four CD servo systems that control the mechanical operation of a record player. If the record player is capable of reproducing data from the CD surface, the spindle, tracking, radial / traverse, and focus servo systems must operate normally. Data reproduction Data reproduction is commonly referred to as 8- to 14-bit modulation (EFM) detection. After the laser beam is reflected back to the photodiode array,