S4b from Directional speakers as a tool for animal vocal communication studies

a label file indicating the calls start and end times as well as call_type (recruitment or close call) and origin (Source recording, Conventional speaker, Parametric speaker)该标签文件用于标注各类通话的起止时间，同时记录通话类型（招募通话（recruitment）或收尾通话（close call））以及通话来源（源录制（Source recording）、传统扬声器（Conventional speaker）、参数化扬声器（Parametric speaker））