As discussed in Chapter 7, audiences notice immediately when sound falls out of sync. As a result, maintaining sync is a priority during all phases of production and postproduction.
If you record audio to your DV tape, whether you record directly to the camera or route the audio through a sound mixer, the camera keeps the audio in sync with the picture by using timecode. Timecode identifies the exact location of any part of a recording in terms of hours, minutes, seconds, and frames. There are approximately 30 frames per second in NTSC video, so NTSC timecode lets you pinpoint a part of your recording down to 1/30th of a second. DV cameras automatically add matching timecode to the audio and video that you record, and when you capture your footage to a digital editing system, you capture the timecode along with it.