A 2-pop is useful whenever picture and sound are handled separately.

A 2-pop is typically placed at the end of a visual countdown.

Ken is a regular contributor to the 2-pop boards.

Therefore, while the loudness of the 2-pop may be the same as the bars and tone audio level in use, this is not a requirement.

Aligning them by the 2-pop would ensure proper synchronization during playback.

DV Film-making with 2-pop http://www.2-pop.com Contains discussions and resources for DV filmmakers.

Used in television production and filmmaking post-production, a 2-pop is a 1 kHz tone that is one frame long and placed 2 seconds before the start of program.

Whereas laying down bars and tone prior to program start establishes video and audio calibration levels on the tape, the 2-pop is primarily used for picture and sound synchronization.