【简答题】
请解释跟踪外基准源和过滤外基准源。
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答案
跟踪外基准源：给定一个理想外基准源，时钟设备应尽可能理想地还原外基准源，尽可能少地产生噪声。过滤外基准源：输入的外基准源存在相位漂动、抖动，时钟设备应具备滤除漂动、抖动的能力。
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