the camera generates time code
then the recorder will record that signal in addition to the audio.
This makes synchronization of sound rolls with picture a very simple process.
the camera doesn't generate time code
than a slate is required to find the various takes. If an electronic
slate is used (one where time code is dislayed in a large LED display)
then it is fed code from the recorder and the camera films the slate at
the start of the take. This gives the exact information as to where the
audio is to be found on the picture itself.