B

backing object
In multimedia streaming, either the Microsoft® DirectDraw® surface for video or the IAudioData object for audio.
bi-phase mark
A method of encoding digital data such that clock timing and bit stream data are encoded into a square wave. Because 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.
blit
Bit block transfer. Used to transfer all or part of a bitmap from a source such as memory or the screen, to a destination such as another memory or display surface.
bob
A method of displaying interlaced video fields on a progressive monitor. In bob mode, one field is displayed at a time, the even lines alternating with the odd lines. The lines are stretched by a factor of two, to fit the entire display area.