B

backing object: Multimedia streaming - The backing object is either the DirectDraw surface for video or the IAudioData object for audio.
bi-phase mark: A method of encoding digital data within an analog signal. Bi-phase mark code is self-clocking (signal alternates on entry and exit) and not polarity conscious (identical values can be on top or bottom). Since it can be read over a wide range of play speeds it is used for LTC signals. (originally known as Manchester-1 code).
blackburst: A video signal that can be used to synchronize multiple video sources. Blackburst contains the vertical sync, horizontal sync, and the chroma burst information, but no active picture information.