HARD DISK
HDCP
HDMI
HDTV
HEADPHONES
HELICAL SCAN
HI-8
HI-COLOR
HISS
HORIZONTAL AND VERTICAL SYNC PULSES
HORIZONTAL TILT
HOT SWAPPING
HSI
HSL
HSV
HUE
HUM
HARD DISK
A mass storage media for digital information used in computers, video and audio and recently also used for digital image/video storage in digital cameras and camcorders. In contrast to a floppy disk, the hard disk is usually non-removable (though there are already some removable and transportable hard disks). The access time of a Hard disk is much shorter than that of a floppy disk, and the amount of data (images or full video-scenes, for example) that can be stored on a large disk can reach several gigabytes (thousands of megabytes). The name hard disk comes from its internal construction of metal (mainly aluminum) platters, which are very stiff, and not floppy.
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HDCP
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HDMI
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HDTV
High Definition TV. Several standards were introduced for HDTV broadcast, with much higher resolution on a special TV screen. HDTV or the like - IDTV or EDTV – is becoming the predominant system in broadcast and home. There are two basic standards of HDTV - analog and digital. The analog system was used mainly in Japan but is being phased out, while the digital system was adopted by the US, Australia and Europe, and later also adapted in Japan. Several broadcast stations already transmit HDTV signals, but the price of the receivers is still quite high, thus limiting the penetration of HDTV to the home market. The chosen display format for HDTV is 16:9 vs. the classic 4:3 aspect ratio.
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HEADPHONES
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HELICAL SCAN
A method of recording video information on VCR tapes. The tape is scanned in a helical (slanted) way rather than horizontally or vertically. The helical scan method packs much more information on a given length of magnetic tape than all other methods. For this reason this method is used in the digital world as well - in DAT and in digital video recording systems.
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HI-8
A Y/C video format similar to Super-VHS, introduced by SONY™, using 8mm wide videotapes. Picture quality is very high and camcorders using this format are very small and handy, making them a very good choice for amateur and semi-pro video photographers.
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HI-COLOR
A computer graphics format, beyond VGA and Super-VGA, which displays 32,000 or 64,000 simultaneous colors on the screen at 640x480 pixels resolution and above. This number of shades of color, simultaneously displayed on the screen, exceeds the color resolution of the human eye, which can resolve about 4,000 different shades of color. True color displays 16.7 million shades of color (24-bit color information).
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HISS
(рус. Шипение)
The primary background noise in audio recording, stemming from circuit noise in the amplifiers of the playback recorder or from residual magnetism on the tape. Several noise reduction methods are available, such as Dolby™, DNR (Dynamic Noise Reduction), DNL (Dynamic Noise Limiter), etc., to reduce the hiss while still retaining full signal bandwidth. In video transmission, \''hiss\'' or high frequency noise, may show as snow on the screen.
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HORIZONTAL AND VERTICAL SYNC PULSES
The horizontal sync signal is a short pulse at the beginning of each video line which keeps the horizontal scanning of the monitor exactly in step with the transmission of each new line. The vertical sync signal is a pulse transmitted at the beginning of each field and frame. Its purpose is to maintain the monitor in field-by-field synchronization with transmission of the next frame pulse. Sync signals reside in a part of the video signal in which no visual picture information is transmitted. During that particular part of the transmission (the blanking retrace period or vertical interval), the electronic beam is blanked and retraces back to the other side of the screen to start a new line or a new frame. Both horizontal and vertical sync are needed to create a fully stable picture.
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HORIZONTAL TILT
A line-time distortion, tilting the edge of a white bar. The phenomenon shows on the screen as white or black streaks, bleeding away from the original position, creating a muddy, fuzzy image on the screen. It is a result of the poor low frequency response of an amplifier, (see Vertical tilt.) Horizontal Tilt should not be greater than 0.5% in professional applications.
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HOT SWAPPING
A feature built into an electronic device, allowing connecting or disconnecting cards, power supply elements or external devices while the original device is powered.
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HSI
Hue, Saturation and Intensity. This is a color space (a way to represent color) that describes an image. This measure uses polar coordinates. RGB color space is based on a Cartesian coordinate system.
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HSL
Hue, Saturation and Lightness. A measure similar to HSI.
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HSV
Hue, Saturation and Value. A measure similar to HSI.
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HUE
Often used synonymously with the term tint. It is the dominant wavelength, which distinguishes a color or tint as red or yellow, etc. Video hue is influenced by several factors: Adjustment of the white balance of the camera, quality of the electronic equipment which is being used and lighting of the scene. In the NTSC standard, hue errors are more common than in the PAL standard due to a different color encoding system. The PAL system compensates for color problems and it corrects wrong hues during operation. Video color processors are the main tools used to adjust and correct hue problems. For example, when videotape is shot in a green park there is a tendency for a greenish tint to dominate the whole scene, which should be removed in order to restore natural skin tones.
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HUM
(рус. Фон)
An interfering visual or aural signal resulting from poor coupling or connection between machines, ground loops, transformer or other electric noise or a bad electronic design.
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