Definitions for "Drop Frame"
Keywords:  smpte, tenth, skipped, clock, minute
Drop frame is one of the two SMPTE code types, and is the NTSC colour television standard. When using this code type, 108 specific frame numbers are "dropped" for each hour of time code.
Type of SMPTE time code designed to exactly match the real time of common clocks. Two frames of time code are dropped every minute, on the minute, except every tenth minute. This corrects for the fact that video frames occur at a rate of 29.97 per second, rather than an exact 30 frames per second.
Time code that removes frame numbers (not frames themselves) in order to achieve perfect sync with broadcast clocks.