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- Number of terms: 20560
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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
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Industry:Software
A device that allows transitions between different video pictures. Also allows keying and matting (compositing). See Video Switcher.
Industry:Software
a) The magnitude of the output when reproducing a tape recorded with a signal of given magnitude and frequency. The sensitivity of an audio or instrumentation tape is normally expressed in dB relative to the sensitivity of a reference tape measured under the same recording conditions.
b) The amount of signal a camera can emit from a particular sensor illumination at a particular SNR, sometimes expressed as a certain scene illumination (in lux or foot-candles) at an assumed reflection and signal strength, at a particular lens transmission aperture, at a particular SNR.
The sensitivity of a camera can be truly increased by improving its image sensor, increasing its transmission aperture, or slowing its frame rate; it can be seemingly increased by allowing the SNR to be reduced. All other things being equal, at this time the sensitivity of an HDEP camera is less than the sensitivity of an NTSC camera. The sensitivity of first-generation HDTV 1125 scanning-line cameras is two to three stops less sensitive than that of a 525-line camera (needing four to eight times as much light).
HARP tubes and new CCD advances may offer a solution to this problem.
Industry:Software
Wired control protocol which activates/deactivates a VCR’s record pause function. Many non-compatible versions of this protocol exist.
Industry:Software
A general term used to describe a device used to correct video image problems.
Industry:Software
a) European video standard with image format 4:3 aspect ratio, 625 lines, 50 Hz and 4 MHz video bandwidth with a total 8 MHz of video channel width. PAL uses YUV; The Y component represents Luminance, the U component represents B-Y, The V component represents R-Y. The V component of burst is inverted in phase from one line to the next in order to minimize hue errors that may occur in color transmission. b) The color television transmission standard used in Europe and other parts of the world. This standard uses a subcarrier which is alternated 90 degrees in phase from one line to the next to minimize hue errors in color transmission. PAL-I uses a 4.43361875 subcarrier. A single frame (picture) in this standard consists of 625 scanning lines. One frame is produced every 1/25 of a second. PAL-M uses a 3.57561149 MHz subcarrier and 525 scanning lines. One frame is produced every 1/30 of a second. c) The television and video standard in use in most of Europe.
Consists of 625 horizontal lines at a field rate of 50 fields per second. (Two fields equals one complete frame.) Only 576 of these lines are used for picture. The rest are used for sync or extra information such as VITC and Closed Captioning.
Industry:Software
A type of scalability where an enhancement layer also uses predictions from pel data derived from a lower layer without using motion vectors. The layers can have different frame sizes, frame rates or chroma formats. Spatial scalability offers a layering of the picture resolution, suitable for HDTV transmissions, for instance. By decoding of the lower layer, a “normal” picture is obtained, and by decoding of the enhancement layer, the HDTV picture may be constructed.
Industry:Software
A concept for television receivers that acknowledges an absence of ATV transmission/distribution standards and allows a receiver to deal with a multiplicity of standards and delivery mechanisms.
Industry:Software
