Two-talker overlapped speech is artificially generated by mixing these waveform segments. To maximize the speech overlap, we developed a procedure to mix similarly sized segments at around 0dB. First, we sort the speech segments by length. Then, we take segments in pairs, zero-padding the shorter segment so both have the same length. These pairs are then mixed together to create the overlapped speech data. 
 Question: How are the two datasets artificially overlapped?
we sort the speech segments by length we take segments in pairs, zero-padding the shorter segment so both have the same length These pairs are then mixed together