- المجال:
- 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.
A microphone is a transducer which converts sound waves to electrical impulses. Microphones typically generate very low signal levels requiring low noise, high fidelity, pre-amplification to boost the output signal to a level compatible with audio amplifier circuitry.
Good microphone preamplifiers provide precise matching of microphone impedance and low-noise electronic components.
Industry:Software
All of the machine states necessary to fully execute an instruction.
Industry:Software
A convenient linear scale for measuring, in arbitrary units, the relative luminance amplitudes within the scene to be recorded in a video or photographic image, as shown below. The relative luminance scale is one factor affecting the choice of suitably artistic scene reproduction. It may establish the optimum rendition of reference white and optimum employment of the nonlinear transfer function in image recording.
Note: This relative luminance scale (linear in luminance) resembles IRE units (linear in voltage) in positioning both black level reference and reference white at 0 and 100, respectively, but that it differs in recognizing the extended luminance range of many commonly encountered scenes.
Industry:Software
A term used for editing and the storage of audio, video, and data. Information (footage) is available anywhere on the media (computer disk or laser disc) almost immediately without having to locate the desired information in a time linear format.
Industry:Software
A key mode which allows use of independent key mask generators to create a pattern to prevent some undesirable portions of the key source from cutting a hole in the background. This is also possible using externally generated masks on the Vista.
Industry:Software
In video transmission, refers to the mechanical vibration of the elements of an electron tube resulting in a spurious modulation of the normal signal. This usually results in erratically spaced horizontal bars in the picture.
Industry:Software
Unit that interprets the program instructions into control signals for the rest of the system.
Industry:Software
a) When television was monochrome and sensors were in approximate conformance to CIE Photopic Spectral Luminous Efficiency Function, it became common to think of the video signal as the luminance signal. With the introduction of color, a matrix was designed to develop a luminance function by weighting the R, G, B signals in accordance with the CIE Photopic Spectral Luminance Efficiency Function, producing a video signal compatible with monochrome receivers. b) A signal that has major control of the image luminance. It is a linear combination of gamma-corrected primary color signals. c) The specific ratio of color primaries that provides a match to the white point in a specified color space.
d) The definition of luminance, television is identical for NTSC, PAL, and SECAM (CCIR Report 624-4), as follows: E'Y = (0.299) E'R + (0.587) E'G + (0.014) E'B. The weighting function is named luminance signal in all of the television standards. For convenience and bandwidth conservation, however, it is always formed from the gamma correction signals (i.e., R', G', B') and not from the initial linear signals, and thus it is not an exact representation of luminance, physics.
Industry:Software
Amplitude dependent waveform distortions. This includes APL and instantaneous signal level changes. Analog amplifiers are linear over a limited portion of their operating range. Signals which fall outside of the linear range of operation are distorted. Nonlinear distortions include crosstalk and intermodulation effects between the luminance and chrominance portions of the signal.
Industry:Software
The electronic crosspoints which switch and route key signals and key insert signals to appropriate key processing electronics. On Ampex switchers, these matrices are controlled by keypads and keyer insert selector push-button controls and form the Phantom matrix portion of the switcher.
Industry:Software
