- Industrie:
- 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.
When an analogue master videotape is duplicated, the second-generation copy is usually inferior in some way to the master. This degradation appears as loss of detail, improper colors, sync loss, etc.
Limited frequency response of audio/video magnetic tape and imperfections in electronic circuitry are the main causes of generation loss. Higher performance formats (such as 1") exhibit much less generation loss than more basic formats. Digital formats make generation loss negligible because each copy is essentially an exact duplicate of the original. Video enhancing equipment can minimise generation loss. Some video processors pre-enhance the video signal to overcome generation loss.
Industry:Software
Describes a picture condition in which the scanning lines start at relatively different points during the horizontal scan.
See Serrations and Jitter.
Industry:Software
A) The process of locking both the sync and burst of one signal to the burst and sync of another signal making the two signals synchronous.
This allows the receiver’s decoder to reconstruct the picture including luminance, chrominance, and timing synchronisation pulses from the transmitted signal.
b) The ability to internally lock to a non-synchronous video. AVC switchers allow genlocked fades on the DSK.
Industry:Software
A pulse at the horizontal sweep rate used in TV cameras.
Its leading edge is coincident with the leading edge of the horizontal sync pulse and the trailing edge is coincident with the leading edge of the burst flag pulse.
Industry:Software
A timed colour black output synchronous with the input reference video. The AVC series also provides the DSK genlocked colour black. On 4100 series switchers, this also includes composite sync, subcarrier, vertical and horizontal drive pulses, burst flag pulse, and composite blanking.
Industry:Software
The time period between lines of active video. Also called Horizontal Blanking Interval.
Industry:Software
Any aberration which causes the reproduced picture to be geometrically dissimilar to the perspective plane projection of the original scene.
Industry:Software
A subsystem in a video receiver/decoder which detects horizontal synchronising pulses, compares them with the on-board video clock in the video system, and uses the resultant data to stabilise the incoming video by re-synching to the system clock. In the case of severe horizontal instability, a large FIFO memory may be required to buffer the rapid line changes before they are compared and re-synchronized.
Industry:Software
The shape of objects in a picture, as opposed to the picture itself (aspect ratio). With good geometry, a picture of a square is square.
With poor geometry, a square might be rectangular, trapezoidal, pillowshaped, or otherwise distorted. Some ATV schemes propose minor adjustments in geometry for aspect ratio accommodation.
Industry:Software
A) Rating of the fine detail (definition) of a TV picture, measured in scan lines. The more lines, the higher the resolution and the better the picture. A standard VHS format VCR produces 240 lines of horizontal resolution, while over 400 lines are possible with S-VHS, S-VHS-C, and Hi-8 camcorders. b) Detail across the screen, usually specified as the maximum number of alternating white and black vertical lines (line of resolution) that can be individually perceived across the width of a picture, divided by the aspect ratio. This number is usually expressed as TV lines per picture height. The reason for dividing by the aspect ratio and expressing the result per picture height is to be able to easily compare horizontal and vertical resolution. Horizontal chroma resolution is measured between complementary colours (rather than black and white) but can vary in some systems (such as NTSC), depending on the colours chosen.
Horizontal resolution in luminance and/or chrominance can vary in some systems between stationary (static resolution) and moving (dynamic resolution) pictures). It is usually directly related to bandwidth.
Industry:Software
