Audio/Video Glossary

OMNIDIRECTIONAL MICROPHONE: Microphone pickup pattern type characterized by a circular-shaped pickup pattern. This type favors sound arriving from all directions. Also called a non-directional microphone.
ON-THE-FLY: To write "on-the-fly" means to write data to CD, referenced in a virtual image without first writing a real ISO 9660 image.
ORANGE BOOK: (See Multisession)
OVERLAY: Keyed insertion of one image into another. Overlay is used for example, to superimpose computer generated text on a video image, for titling purposes. The overlay procedure requires synchronized sources for proper operation.
OVERSCAN: Video images generally exceed the size of the physical screen. The edge of the picture may or may not be displayed, to allow variations in television sets. The extra area is called the overscan area. Video productions are planned so critical action only occurs in the center safe title area. Professional monitors are capable of displaying the entire video image including the overscan area.

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