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- Number of terms: 20560
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- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
An adjustment for keys that determines the sharpness of the key edges. As key gain is reduced, keys become softer at the edges and may be adjusted to be more transparent.
Industry:Software
Low level, short duration dropouts. They correspond to RF envelope dropouts of 10 dB or greater with a duration of 0.5 to 0.8 microseconds.
Industry:Software
For comparisons of perceived image quality resulting from a controlled variant within a single system, a requirement encountered when fine-tuning a system, the technique of ordinal-scaling is frequently employed. The ordinal-scale indicates that one image is preferred over another. Observers are asked to evaluate perceived image quality on an established scale, usually of five levels, from excellent to unacceptable. Correlations among isolated tests are sometimes uncertain.
Industry:Software
A terrestrial broadcasting technology which uses low-power microwave transmitters, and is mainly used for extending the range of cable TV systems and for TV distribution in sparsely populated areas or in areas with rough terrain.
MMDS is not specifically analogue or digital. In digital MMDS, the use of MPEG is highly attractive to boost the number of channels that may be distributed.
Industry:Software
A transducer which converts sound pressure waves into electrical signals.
Industry:Software
When images that differ significantly in creation, display, and content are being compared and intervalscaling becomes necessary, interpretation of the results become more and more complex as the number of observers is increased. Ratio-scaling provides a means for correlating multiple observations and multiple data sources. Observers are asked to assign a numerical value to perceived image quality (either in total or with regard to a specified characteristic such as noise, resolution, colour rendition, etc.). They are also asked to identify numerical values for the best possible image, and the completely unacceptable image. Each is allowed to choose a numerical scale with which the observer feels most comfortable. The relationship between the value for the test image and the two extremes provides a useful ratio.
Analyses involving comparisons among observers, comparisons with other systems, correlation of results obtained over periods of time, etc., are made by normalising each observer’s scale (for example, best possible = 100, completely unacceptable = 0).
Industry:Software
A video system is considered to be locked when the receiver is producing horizontal syncs that are in time with the transmitter.
Industry:Software
The data broadcast specification profile for multiprotocol encapsulation supports data broadcast services that require the transmission of datagrams of communication protocols via DVB compliant broadcast networks. The transmission of datagrams according to the multiprotocol encapsulation specification is done by encapsulating the datagrams in DSM-CC sections, which are compliant with the MPEG-2 private sector format.
Industry:Software
A) A luminance key mode which inverts the polarity of the key source to allow dark areas of the source video to cut holes in background instead of bright areas. b) A chroma key mode which inverts the foreground and background positions.
Industry:Software
In order to obtain the highest quality output signal from a microphone, a preamplifier input should provide a load (impedance) which exactly matches a microphone’s output impedance.
Microphone output impedances vary from 150 ohms to several megohms.
Industry:Software
