请教大家，关于APRS的作用和用法

zhongduzhe

查了一下说明书，是这样写的：
Because the dynamic range of cassette tape is narrower than the dynamic range of a digital source, the recording will be too noisy if the recording level setting is too low,and,conversely, the recorded sound will be distorted if the setting is too high.
It was for this reason that it has always been recommended that the signals to be recorded be first (before recording)input to the cassette deck and the recording level then be set while watching the level meter, but, for former conventional level meter equipped with the peak-hold function, it was necessary to re-adjust and input the signals again if the level setting was too high or too low.
This unit,however, is equipped with the APRS: Advanced Precise Recording-level System, which holds and displays the maximum peak of the input signal level,so that once the peak level of the source is held, there is no necessity to re-input the source signals, and the optimum recording level can be set.
●The APRS function can be used only during the recording-standby mode.
线上翻译是这样的：
由于盒式磁带的动态范围比数字源的动态范围要窄，因此如果录制级别设置过低，录制将会太嘈杂，相反，如果设置太高，录制的声音将会失真。
因此，一直建议首先将要记录的信号（在记录之前）输入到盒式甲板，然后在观看电平仪时设置记录电平，但对于以前具有峰值保持功能的传统电平计，如果电平，有必要重新调整并再次输入信号。设置过高或太低。
但该单元配备了APRS：高级精确记录电平系统，它可以保持并显示输入信号电平的最大峰值，因此一旦保持了源的峰值水平，就无需重新输入源信号，并且可以设置最佳的记录电平。
●APRS功能只能在录音-待机模式下使用。

但是还是不怎么懂，希望大家能解答一下。

醉心曲

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