The technology was then developed to sync words and music to the characters talking in the film.
随后开发的技术可以将文字和音乐与电影中说话的角色同步。
英语百科
Syncword
（重定向自Sync word）
In computer networks, a syncword, sync character, sync sequence or preamble is used to synchronize a data transmission by indicating the end of header information and the start of data. The syncword is a known sequence of data used to identify the start of a frame, and is also called reference signal or midamble in wireless communications.