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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.
A standard introductory identification directing access to a digital image file. The header provides a brief image file identification, universally decodable, indicating the format and length of the data block. The (optional) descriptor conveys additional information improving the usefulness of the data block to the user, such as cryptographic, priority, or additional error-protection information as well as source, time, authorship, ownership, restrictions on use, processing performed, etc.
Industry:Software
A process which starts with the low-order byte and ends with the high-order byte. Intel processors use the little endian format.
Industry:Software
An average satellite transponder has a bandwidth of 27 MHz. Typically, the highest symbol rate that can be used in SR 26 MS/s, and multiple video or audio channels can be transmitted simultaneously. MCPC uses a technique called Time Division Multiplex to transmit multiple programs, which works by sending data for one channel at a certain time and then data for another channel at another time. Many encoder manufacturers are currently experimenting with statistical multiplexing of MPEG-2 data. Using this technique, channels that need high data rate bursts in order to prevent pixelization of the picture, such as live sports events will obtain the bandwidth as they need it by reducing the data rate for other services that do not. Statistical multiplexing should improve perceived picture quality, especially on video that changes rapidly.
It also has the advantage of requiring no changes in the receiver equipment.
Industry:Software
Vertical resolution of a scanned image subjectively evaluated is consistently shown to be less than the geometrically-predicted resolution.
Observations are usually stated in terms of the ratio of perceived television lines to active lines present in the display. From the time that R. Kelt published his studies (conducted on a progressive scanned image), there have been numerous numerical values and substantiating theories proposed for this effect. The range of results suggests that many details of the experiments influence the result and make defining a single “Kell Factor” impossible. Reported experimental results range at least between 0.5 and 0.9. In an otherwise comparable display, the “ratio” is lower for interlaced scanning than for progressive scanning.
Industry:Software
The standard database of approved, registered data element tags, their definitions and their allowed formats.
Industry:Software
SMPTE Working Group H19.16 has proposed SMPTE Standard H19.161 defining the file format for the exchange of digital motion-picture information on a variety of media between computer-based systems. This flexible file format describes pixelbased (raster) images with attributes defined in the binary file descriptor, which identifies: generic file information, image information, data format, and image orientation information, motion-picture and television industry, specific information, user defined information. The draught assumes nonrealtime application, with formats for real-time to be considered as the developing technology permits.
Industry:Software
Actually presented in the studio, with cameras feeding out to the lines as the performance is done.
Industry:Software
A display controller architecture characterised by having multiple FIFOs or write buffers. There is typically one FIFO or write buffer at the CPU interface, and one or more FIFOs in the display pipeline.
Industry:Software
A number describing the loss of vertical resolution from that expected for the number of active scanning lines. Named for Ray Kell, a researcher at RCA Laboratories. Many researchers have come up with different Kell factors for progressively scanned television systems. These differences are based on such factors as aperture shape, image content, and measurement technique. A generally accepted figure for the Kell factor is around 0.68, which, multiplied by the 484 active NTSC scanning lines, yields a vertical resolution of 330 lines, matched by NTSC’s 330 lines of horizontal resolution per picture height (see Square Pixels). It is important to note that most studies of the Kell factor measure resolution reduction in a progressive scanning system. Interlaces scanning systems suffer from both a Kell factor and an interlace coefficient.
Industry:Software
Integrated circuits made of field effect transistors. All MOS devices originally used metal gate technology, but the term is used to describe silicon gate circuits as well.
Industry:Software
