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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.
The data signal is used to modulate the frequency of a “carrier” having a frequency much higher than any spectral component of the data signal. Permits the recording of DC or very low signal frequencies.
Industry:Entertainment
Dual carrier FM-coded discrete stereo transmissions, analogue.
Can be used for bi-lingual operation under user selection, but no autoselection is available. Audio characteristics better than standard mono soundtrack.
Industry:Entertainment
Takahiko Fukinuki and the Fukinuki Hole named for him.
Fukinuki is a Hitachi researcher who proposed filling an apparently unused portion of the NTSC spatio-temporal spectrum with additional information that might be used for ATV. The signal that fills a Fukinuki hole is sometimes referred to as a Fukinuki subcarrier. It is extremely similar to the colour subcarrier and can cause an effect like cross-luminance under certain conditions.
Industry:Entertainment
A Hitachi ATV scheme filling a Fukinuki hole for increased luminance detail, with recent proposed additions to increase chroma detail.
Industry:Entertainment
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 centre 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 picture in which the two fields in a frame are coded independently. Field pictures always come in sets of two fields, which are called top field and bottom field, respectively. When the first field is coded as a P- or a B-picture, the second picture must be coded in the same manner; however, if the first field is coded as an I-picture, the second field may be coded as either an I-picture or a P-picture (that is predicted from the first field).
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
