Original WFDB C package notes and nuances

WFDB Invalid sample limitation

Currently the wfdb library does not account for >16bit formats and hence uses the value -32768 as nan.

For this python package for rdsamp physical==0, I have currently decided to set empty multi-segment channels (with stacksegments==1) to -2^31. We can revise this later if needed and see what happens with the next version of the wfdb library. In addition, all format samples will be stored (with physical==0) as they are with no mapping.

For rdsamp for option physical==1, 2^(fmt-1) will be interpreted as nans.

首先阅读 rdsamp 对 physical==0 和 physical==1 的处理，包括 stacksegments==1 的空多段通道。将 package 的行为与原始 WFDB C package 对无效 sample 的约定进行比较。当 -2^31、2^(fmt-1) 以及未映射格式 sample 的预期处理已得到明确记录或解决时，即视为完成。