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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.
A tape transport mechanism in which the tape’s speed and tension are controlled by contact with a capstan at each end of the head assembly.
Industry:Entertainment
A form of compression in which the codec uses information not only from frames that have already been decompressed, but also from frames yet to come. The codec looks in two directions: ahead as well as back. This helps avoid large spikes in data rate caused by scene changes or fast movement, improving image quality.
Compare with Unidirectional Prediction.
Industry:Entertainment
A camera shot that is tightly framed, with its figure or subject filling the screen. Often qualified as medium closeup or extreme closeup.
Industry:Entertainment
An MPEG picture that is coded using motion compensated prediction from past and/or future reference pictures. Motion vectors pointing forwards and backwards are used, and they may point at either I-pictures or P-pictures. The B-pictures provide the highest compression, but demand knowledge of several pictures. Consequently, B-pictures give a higher delay and call for a larger picture memory. B-pictures are never used as a reference in a prediction.
When B-pictures are part of a sequence, the pictures are not sent in chronological order owing to the fact that future P-pictures and/or I-pictures are needed (and therefore must be decoded) for the decoding of B-pictures. The P- and I-pictures have to be sent earlier than the actual point of time to which they relate.
Industry:Entertainment
The magnetic layer of a magnetic tape, consisting of oxide particles held in a binder that is applied to the base film.
Industry:Entertainment
A process which starts with the high-order byte and ends with the low-order byte. Motorola 68000 processors used the big endian format.
Industry:Entertainment
The electrical resistance of the coating measured between two parallel electrodes spaced a known distance apart along the length of tape.
Industry:Entertainment
A keyer where two levels of hole cutting are independently adjustable. The top level, or insert, cuts a hole and fills with the key video. In a luminance key, the second level forms the border of the key; in a chroma key, the second level forms the shadow. The second level has adjustable luminance allowing borders to be varied from black to white and shadows to be varied in density. This is the type of keying provided on all Ampex switchers.
Industry:Entertainment
The thickness of the magnetic coating applied to the base film of a mag tape. Modern tape coatings range in thickness from 170 to 650 microinches. Coating thickness is normally optimised for the intended application. In general, thin coatings give good resolution at the expense of reduced output at long wavelengths; thick coatings give a high output at long wavelengths at the expense of degraded resolution.
Industry:Entertainment
A base-2 numbering system using the digits 0 and 1 (as opposed to 10 digits, 0-9 in the decimal system). In computer systems, the binary digits are represented by two different voltages or currents, one corresponding to 0 and the other corresponding to 1. All computer programmes are executed in binary form. Binary representation requires a greater number of digits than the base-10 decimal system more commonly used. For example, the base-10 number 254 is 11111110 in binary. The result of a binary multiplication contains the sum of digits of the original numbers: in binary: 10101111 x 11010100 = 10010000011101100 in decimal: 175 x 212 = 37,100 From right to left, the digits represent 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768. Each digit is known as a bit. This example multiples two 8-bit numbers to produce a 16-bit result, a very common process in digital television equipment.
Industry:Entertainment
