| The Glossary An all inclusive glossary of security lingo is provided for your convenience. This list will undoubtedly be helpful when delving in to the realm of security. |
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| N: Noise - An unwanted signal produced by all electrical circuits working above the absolute zero. Noise cannot be eliminated but only minimized. Non-drop frame time code - SMPTE time code format that continuously counts a full 30 frames per second. Because NTSC video does not operate at exactly 30 frames per second, non-drop-frame time code will count 108 more frames in one hour than actually occur in the NTSC video in one hour. The result is incorrect synchronization of time code with clock time. Drop-frame time code solves this problem by skipping or dropping 2 frame numbers per minute, except at the tens of the minute count. Non-interlaced - The process of scanning whereby every line in the picture is scanned during the vertical sweep. NTSC - National Television System Committee. American committee that set the standards for color television as used today in the US, Canada, Japan and parts of South America. NTSC television uses a 3.57945 MHz sub-carrier whose phase varies with the instantaneous hue of the televised color and whose amplitude varies with the instantaneous saturation of the color. NTSC employs 525 lines per frame and 59.94 fields per second. Numerical aperture - A number that defines the light gathering ability of a specific fiber. The numerical aperture is equal to the sine of the maximum acceptance angle. |
Courtesy of CCTV Labs and CCTV focus magazine
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