J J-CARD A term used to describe the cardboard label insert used in most recordable audio and video media cases. The name derives from the way these labels are folded to fit inside their respective media cases. JITTER Timing innacuracies in the transmission and reception of a digital bit-stream. In audio, timing variations in the clock reference of digital audio signals, which cause distortion. In video, small, rapid variations in a waveform or image due most often to mechanical disturbances. (See TBC) JPEG (Joint Photographic Experts Group) The name applied to the digital compression standard for still video images allowing them to occupy less memory or disk space. Like the MPEG standard, it includes options for tradeoffs between storage space and image quality.
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