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这是它的简介：
The modulation method employed in the Compact Disc (CD) digital audio system codeveloped by Philips N.V. (Eindhoven, The Netherlands) and Sony Corporation (Tokyo, Japan) is described. This method, called eight-to-fourteen (EFM), is an 8 (data bit) ---> 14 (channel bit) conversion block code with a space of 3 channel bits for every converted 14 channel bits which is used to connect the blocks. These 3 channel bits, called merging bits, are selectable, enabling the suppression of the low-frequency contents of the frequency spectrum.
First some of the major conditions are listed which are required of the modulation method used for recording/reproducing digital audio signals on an optical disk. The various parameters of EFM as a modulation method are explained in the second part, proving the suitability of EFM for optical disks. An actual example explains the method in detail; a frequency spectrum is also given to enhance understanding.
EFM is well matched with the error-correction method CIRC employed in the CD. The combination of these two methods plays an important role in stably reproducing a 2-channel 16-bit audio signal on a 12-cm-diameter optical disk for more than playing time, single sided.
描述了由Philips N.V.（荷兰埃因霍温）和Sony Corporation（日本东京）共同开发的光盘（CD）数字音频系统中采用的调制方法。这种方法称为八到十四（EFM），是8（数据位）-> 14（通道位）转换块代码，每个转换的14通道位都有3通道位空间，用于连接块。这3个通道位（称为耦合位）是可选的，从而可以抑制频谱的低频内容。
首先列出了一些主要条件，这些条件是用于在光盘上记录/再现数字音频信号的调制方法所必需的。第二部分介绍了EFM作为调制方法的各种参数，证明了EFM适用于光盘。一个实际的例子详细解释了该方法。还提供了频谱以增进理解。
EFM与CD中使用的CIRC纠错方法非常匹配。这两种方法的结合,使得可以稳定地在直径为12厘米的光盘上,重放2通道16位音频信号的时间超过LP双面播放的时间，这两种方法的结合起着重要作用。
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发表于 2020-11-19 20:05
