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Dictionary of Technical Terms - H
Unit of measurement for the number of cycles of a waveform in one second. Cycles per second.
High contrast, meaning high contrast video used as a key source. The frequency bands from 3 to 30 MHz. Loss of signal amplitude at higher frequencies, caused for example, by passing a signal through a coaxial cable. See high Z looping input. Any symbolic computer language that controls a computer via commands that are similar to human language as opposed to the numbers used in machine language. Control panel button is lit to full brightness (as opposed to dim), usually to indicate that the signal is on air. A high impedance input circuit which also includes an output to enable routing the signal to another piece of equipment. Area of a key where matte occurs behind the key. See key. See H drive.horizontal (blanking) interval
The time period between lines of active video. A Grass Valley Group line of routing switchers capable of handling a large number of inputs and outputs. A single horizontal scan of a camera or CRT beam. A number of these video scans together form a frame of video. There are 525 interlaced lines per frame in NTSC, 625 in PAL. The length of time for a complete horizontal line of video information. See H phase. Chrominance and luminance resolution (detail) expressed horizontally across a picture tube. This is usually expressed as a number of black to white transitions or lines that can be differentiated. Limited by the bandwidth of the video signal or equipment. At the end of each horizontal line of video, a brief period when the scanning beam returns to the other side of the screen to start a new line. The synchronizing pulse at the end of each video line that determines the start of horizontal retrace. See house sync. Television sync generated within the studio and used as a reference for generating and/or timing other video signals.hue (tint, phase, chroma phase)
One of the characteristics that distinguishes one color from another. Hue defines color on the basis of its position in the spectrum-i.e., whether red, blue, green, or yellow, etc. Hue is one of the three characteristics of television color: See also saturation and luminance. In NTSC and PAL video signals, the hue information at any particular point in the picture is conveyed by the corresponding instantaneous phase of the active video subcarrier. Horizontal black and white bars that extend over the entire TV picture and usually drift slowly through it. They are caused by a power line interfering frequency or one of its harmonics. 1. A circuit (often a coil) that introduces a small amount of voltage at power line frequency into the video path to cancel unwanted AC hum. In circuits, the ability to cancel interference in a video or audio signal, often at the 50 or 60 Hz power line frequency. The cancellation of power line hum. See hum-bucker. A circuit that looks very much like a subminiature printed circuit board and is composed of a mix of thick film and surface mounted components. Hybrids make possible improved performance, extended reliability, and economy of space. Use of hybrids permits design of equipment such as entire processing amplifiers (GVG 7510 Series) on single PC modules. Hertz.We've recently redesigned our website so your bookmarked links may no longer work. Please use either the search bar at the top right of this page or select an area from one of the tabs above to find what you are looking for.
