- Branża:
- Number of terms: 20560
- Number of blossaries: 0
- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
One million hertz (unit of frequency). A normal U.S.
television transmission channel is 6 MHz. The base bandwidth of the video signal in that channel is 4.2 MHz. The SMPTE HDEP system calls for 30 MHz each for red, green, and blue channels.
Industry:Software
Broad term used to describe full range of audio, video, and data transmission services that can be transmitted over the air or by cable.
Industry:Software
Distortion effects which occur at low frequency.
Generally considered as any frequency below the 15.75 kHz line frequency.
Industry:Software
Any unwanted electrical disturbances, other than crosstalk or distortion components, that occur at the output of the reproduce amplifier.
System Noise: The total noise produced by the whole recording system, including the tape. Equipment Noise: The noise produced by all the components of the system, with the exception of the tape. Tape Noise: The noise that can be specifically ascribed to the tape. There are several sources of tape noise. See DC Noise, Erase Noise, Modulation Noise, Saturation Noise, and Zero Modulation Noise.
Industry:Software
The K Factor rating system maps linear distortions of 2T pulses and line bars onto subjectively determined scales of picture quality. The various distortions are weighted in terms of impairment to the picture.
The usual K Factor measurements are Kpulse/bar, K2T or Kpulse (2T pulse response), Kbar and sometimes K60Hz. The overall K Factor rating is the largest value obtained from all of these measurements. Special graticules can be used to obtain the K Factor number or it can be calculated from the appropriate formula. All types of linear distortions affect the K Factor rating.
Picture effects may include any of the short time, line time, field time, and long time picture distortions. Any signal containing the 2T pulse and an 18 μsec bar can be used to measure Kpulse/bar, K2T (Kpulse), or Kbar. A field rate square wave must be used to measure K60Hz. The FCC composite test signal contains these signal components. See the discussion on Pulse to Bar Ratios.
Industry:Software
Part of a computer system into which information can be inserted and held for future use. Storage and memory are interchangeable terms. Digital memories accept and hold binary numbers only. Common memory types are core, disk, tape, and semiconductors (which includes ROM and RAM).
Industry:Software
Pertaining to the weight or significance assigned to the digits of a number. In the number 123456, the lower order digit is six. The three low-order bits of the binary word 11100101 are 101.
Industry:Software
A device used to modify a signal’s noise characteristics. In video, noise gates provide optimal automatic suppression of snow (signal noise level). In audio, a noise gate provides a settable signal level threshold below which all sound is removed.
Industry:Software
A field-rate square wave is used to measure this parameter. Locate the center of the field bar time, normalize the point to 100%, and measure the maximum amplitude deviation for each half. Ignore the first and last 2.5% (about 200 μsec). The largest of the two tilt measurements divided by two is the K60hz rating.
Industry:Software
