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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.
Production system HDTV is the analog of studio standard, HDTV, and addresses only a small part of what the SMPTE Committee on Hybrid Technology (H19) considers production, and in fact only a small part of what they consider electronic production. Thus, in the context of SMPTE 240M, Television Signal Parameters 1125/60 High- Definition Production System, production has a much more restrictive definition than that employed by CCIR, or the SMPTE Committee on Hybrid Technology (H19).To illustrate by example from SMPTE 240M, the scope explains, this standard defines the basic characteristics of the video signals associated with origination equipment operating at the 1125/60 highdefinition television production system. It is, therefore, directed to the equipment that first encodes the image information into this electronic format, for example, the studio camera and its associated electronics.
Industry:Software
DCT coefficients before Dequantization. A variable length coded representation of quantized DCT coefficients is stored as part of the compressed video bit stream.
Industry:Software
QuickTime is a software platform from Apple that allows integration of audio visual data into software applications. It supports various algorithms through its built-in image compression manager. The algorithms supported include CinePak, JPEG, and MPEG. QuickTime files have the file extension “.mov.”
Industry:Software
Apple’s multimedia playback environment for Microsoft™ Windows operating system. You use QuickTime for Windows by installing several drivers and libraries on your hard disk.
Industry:Software
a) An additive color space with colorimetric coordinates based on red, green, and blue stimuli or primaries. Color values are negative in certain areas outside the gamut defined by the R, G, B primaries.
The R, G, B values used are intensities. b) The three linear video signals carrying respectively the red, the green, and the blue information. By convention, the unprimed symbols signify that there is a linear relationship between the luminance in each spectral region and the corresponding video signal. The spectral composition of the luminance forming each of these signals is one of the specifications required of the video system. The recently adopted CCIR Rec 709 reflects worldwide agreement on the current definition of R, G, B primary colors. CCIR Rec 709 identifies this as an interim agreement to be superseded by preferred primary colors encompassing a wider color gamut as soon as the technologies and practices permit. c) The colorimetric coordinates defined by thee nonlinear video signals carrying respectively the red, the green, and the blue information. By convention the primed symbols signify that there has been a nonlinear transformation of the video signals vs. luminance, relative, scene, with its resulting modification of the opto-electric transfer function.
Industry:Software
These distortions cause amplitude changes, ringing, overshoot, and undershoot in fast rise times and 2T pulses.
The affected signal components range in duration from 125 nsec to 1 μsec. A 1T pulse must be used to test for these distortions. See the discussion on Linear Distortions. Errors are expressed in “percent-SD.” The presence of distortions in short time domain can also be determined by measuring K2T or Kpulse/bar. See the discussion on K Factor. Picture effects include fuzzy vertical edges. Ringing will sometimes generate chrominance artifacts near vertical edges.
Industry:Software
The relative speed of tape and head during normal recording or replay. The tape-to-head speed coincides with the tape speed in conventional longitudinal recording but is considerably greater than the tape speed in systems where the heads are scanned across or along the tape.
Industry:Software
Memory test pattern in which a single one bit is shifted through each location of a memory filled with 0s. A walking-zero pattern is the converse.
Industry:Software
a) Picture element with equal vertical and horizontal sample spacing, having an aspect ratio of 1:1. Square pixels are used by computers, and the software expects the use of square pixels for proper operation.
Video originally was unconcerned about the aspect ratio of its pixels.
Increasing dependence upon electronic post-production has emphasized the advantage of square pixels. b) System M/NTSC, by comparison, does not have square pixels. With 485 active vertical lines per frame, and 768 samples per active horizontal line (when sampled at four times subcarrier) in a 4:3 aspect ratio, the resulting pixels have an aspect ratio (width:height) of 0.842. c) During image processing, some transforms that manipulate individual pixels as independent picture elements - especially those operations involving any image rotation, distortion, or size changes are performed with simplified programs and less risk of artifacts when the pixels are square.
Industry:Software
