FREQUENTLY ASKED QUESTIONS - R
RCA is a common connector plug for standard consumer video and audio equipment. This type of connector plug may also be described as a "phono" plug. RCA jacks are found on all VCRs and televisions equipped to handle a composite video input. In most cases, RCA jacks are color coded yellow, white, and red. BNC plugs are easily adapted to standard consumer RCA connectors using a simple one-piece plug adapter.
Realtime (or real time)
Realtime (or real time) refers to video recorded at the same speed as action occurs (so it may be played back at the speed of real time without drag). Realtime video is phased at 30 frames per second (60 fields per second) for NTSC video and 25 frames per second (50 fields per second) for PAL format equipment.
Resolution (TV lines)
Resolution (TV lines) refers to the maximum number of vertical lines/pixel elements (horizontal resolution) a video camera is capable of displaying on a monitor or registering with a video recording device. Horizontal resolution indicates the number of pixel elements placed horizontally across each scanning line of resolution (vertical resolution). Horizontal resolution varies based on the abilities of each different camera and each different monitor. Although the number of TV lines of horizontal resolution is generally considered a measure of a camera's level of detail and sharpness, this specification does not always indicate true end video quality.
Resolution (Scanning lines)
Resolution (Scanning lines) refers to something quite a bit different from what is generally considered to be resolution. Scan lines (also referred to as "vertical resolution") of video are equivalent for each different video format, but every device must comply with these standards. Horizontal resolution, on the other hand, indicates the number of pixel elements contained placed horizontally across these scanning lines. Horizontal resolution varies based on the abilities of each different camera and each different monitor. Video display on a monitor requires the image to be constantly shifting (scanning) in order to display in real time. For instance, NTSC format video is based on a 525 scanning lines operating at a frequency of 60 Hz (PAL format is 625 lines, 50 Hz) for transmission and display of video images. This is an interlaced system in which each frame is scanned in two fields of 262 lines, which is then combined to display a complete frame of video with 525 scan lines.