D4
User Manual
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composite video signal. This serves as a colour synchronizing signal to establish a frequency and phase
reference for the Chroma signal. Colour burst is 3.58 MHz for NTSC and 4.43 MHz for PAL.
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Colour Bars
：
A standard test pattern of several basic colours (white, yellow, cyan, green, magenta, red,
blue, and black) as a reference for system alignment and testing. In NTSC video, the most commonly used
colour bars are the SMPTE standard colour bars. In PAL video, the most commonly used colour bars are
eight full field bars. On computer monitors the most commonly used colour bars are two rows of
reversed colour bars
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Seamless Switching:
A feature found on many video switchers. This feature causes the switcher to wait
until the vertical interval to switch. This avoids a glitch (temporary scrambling) which often is seen when
switching between sources.
●Scaling:
A conversion of a video or computer graphic signal from a starting resolution to a new
resolution. Scaling from one resolution to another is typically done to optimize the signal for input to an
image processor, transmission path or to improve its quality when presented on a particular display.
●PIP:
Picture-In-Picture. A small image within a larger image created by scaling down one of image to
make it smaller. Other forms of PIP displays include Picture-By-Picture (PBP) and Picture- With-Picture
(PWP), which are commonly used with 16:9 aspect display devices. PBP and PWP image formats require
a separate scaler for each video window .
●HDR:
is a high dynamic range (HDR) technique used in imaging and photography to reproduce a
greater dynamic range of luminosity than what is possible with standard digital imaging or photographic
techniques. The aim is to present a similar range of luminance to that experienced through the
human visual system.
●UHD:
Standing for Ultra High Definition and comprising 4Kand8Ktelevision standards with a16:9 ratio,
UHD follows the 2K HDTV standard. A UHD 4K displayhasaphysicalresolution of3840x2160 which is
four times the area and twice both the widthandheightofaHDTV/FullHD(1920x1080) video signal.
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EDID:
Extended Display Identification Data. EDID is a data structure used to communicate video display
information, including native resolution and vertical interval refresh rate requirements, to a source device.
The source device will then output the provided EDID data, ensuring proper video image quality.
