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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.
Distortions involving signals in the 64 μsec to 16 msec range. Field time distortions cause field-rate tilt in video signals as shown in the figure below. Error is expressed in IRE or as a percentage of a reference amplitude which is generally the amplitude at the center of the line bar. Distortion can also be expressed as the K Factor of K60Hz. See K60Hz.
These distortions will cause top to bottom brightness inaccuracies in large objects in the picture. These distortions can be measured with either a window signal or a field square wave. See Linear Distortions.
Industry:Entertainment
a) The range of distance in subject space within which a lens (or a system) provides an image that reproduces detail with an acceptably small circle of confusion (acceptable focus) usually small enough for subjective evaluation as a “point,” defines the depth of field.
Tables are calculated for lenses as a function of optical aperture and the subject distance at which they are focused. Regrettably, these calculations are strictly geometric (ignoring the possibility of diffraction effects, of all optical aberrations, and of possible differing contributions to focal length from different annuli of the optical system). Thus, the tables are at times overly optimistic. b) Depth of field for a given imaging system decreases with increasing optical aperture of that system, and decreases as the distance to the subject decreases. A “maximum acceptable” diameter for the “circle of confusion” may depend upon the resolution capabilities of the light-sensitive receptor (electronic or photographic) and of the system within which it is functioning. Quantitative measurements for actual imaging systems may be made on an optical bench. Practical determinations are made from subjective examination of the actual images in the system of interest.
Industry:Entertainment
A microphone (usually a ribbon type) whose sensitivity is greatest to front and rear, and weakest to both sides.
Industry:Entertainment
A container in which you store information such as text, programs, or images.
Industry:Entertainment
A hierarchy of directories and files. Directories contain other directories and files; files cannot contain directories. The root (/) directory is at the top of the hierarchy.
Industry:Entertainment
A client-server protocol which allows users to transfer files over a TCP/IP network. FTP is also the name for the client program the user executes to transfer files. Though it was once the only way to download files on the Internet, it has now been integrated into many web browsers.
Industry:Entertainment
The video information that replaces a “hole” (video information) cut in the video picture by the key signal.
Industry:Entertainment
A video signal which replaces a “hole” (video information) cut in background video by a key source.
Industry:Entertainment
A separate bus or buses from which fill videos can be selected independently from the key source cutting the hole.
Industry:Entertainment
