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Let me introduce you to what I call the PCM boundary. PCM (Pulse-Code Modulation) is the raw, uncompressed digital audio format that eventually gets sent to your speakers. It’s the terminal endpoint of every audio pipeline, regardless of how aggressively encrypted the source was.。爱思助手下载最新版本对此有专业解读
接下来是“拍照”，用高能电子束照射样本。由于电子的波长只有可见光的几千分之一，其成像精度可达原子级别。配合高灵敏度的直接电子探测器（类似于数码相机中的图像传感器CCD），可以精准捕捉穿过样本的电子信号，生成大量清晰的二维投影图像。。PDF资料是该领域的重要参考