Optibase MGW 2400 WMT user manual 135

Appendix D • Glossary of Terms

displayed at a rate of 25 frames per second. PAL is based on a 625/50-line/field system. The bandwidth for PAL is 5.5 MHz for luminance and 1.3 MHZ for U and V. Other standards are NTSC and SECAM.

PCI – Refers to Peripheral; Component Interconnect, a high- speed-system bus specification that provides 32 or 64-bit data paths at 33 or 66MHz clock rates.

Pixel – Refers to a single element of an image.

Post-filtering– Processing pictures after compressing, i.e. scaling to size and smoothing edges.

Pre-filtering– Processing pictures before compressing, i.e. scaling to size and smoothing edges.

P Frame – Predicted frame; used in MPEG compression, which are coded with respect to the nearest previous I or P frames. P frames serve as a prediction reference for B-Frames and future P frames.

Processing – Refer to Encoding.

QSIF – Refers to Quarter Standard Interface Format. The computer industry, which uses square pixels, has defined QSIF to be 160 × 120 active pixels, with a refresh rate of whatever the system is capable of supporting.

Red Book – Formal standards document for CD Digital Audio.

RS-232 – A standard defined by EIA specifying the electrical characteristics of slow-speed interconnections between terminals and computers or between two computers. Although the standard commonly used is RS-232C, most people refer to it as RS-232.

Saturation – Defines the intensity of color. A color with a high saturation appears very strong. A color with low saturation appears washed-out. Zero saturation is white (no color), and maximum saturation is the deepest color possible.

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