Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Production Gear › How is a smart clapperboard used for synchronizing the audio track with the video? › All the smart slates I know
All the smart slates I know jam to (take time from) a time code generator (internal or external). These run at SMPTE standard frame rates of 23.976, 24, 25, 29.97 and 30 fps.
A pro audio recorder locks to the generated frame rate as it has a timecode input jack on it.
Do a search on “timecode” and “timecode slate” on http://jwsoundgroup.net/, a great pro audio forum that discusses this a lot.