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Dictionary of Technical Terms - L
linear pulse distribution amplifier
Linear pulse DAs amplify and fan-out the signal and will handle up to 4V p-p signals (pulses). AC power input cable. Safety hardware that keeps the power cord from being pulled out of its connections. See driver. See program monitor. See program output. Occurring during a horizontal line of the video picture. An unwarranted change in video signal amplitude that occurs in a time frame between 1 and 20 microseonds. The result is a gradual left-to-right shading of the TV picture. The voltage level of the main power source to a device. 1. A communication path between sites, such as a satellite link or a microwave link. 2. An E-MEM(R) mode of operation where registers are recalled in numerical order every time a transition is performed. Those Master 21 preset and program sources through which inputs from an expansion router are mapped. The process of revising an edit decision list to correct duplicate or over-lapping edits so that over-recordings are eliminated. Editor functions that give you the ability to change the edit decision list. Local measured service. An auxiliary switching bus contained within the control panel of a video switcher, as opposed to a remote auxiliary bus panel. In telecommunications, a communications channel between a subscriber and a local company. In digital picture manipulators, a transform that allows movement of the picture along the X and Y axes. To synchronize two or more signals. See gen-lock. In digital picture manipulators, there may be several physical manipulation channels, each of which can be independently assigned to any one of several control panels. If physical channel 2 is the first channel assigned to a control panel, it becomes logical channel 1 for that panel. Thus, logical channels are a method of numbering manipulation channels based on the order in which channels are assigned to a control panel rather than on the physical number of that channel in the electronics frame. That time at which a new source is placed on the program bus, usually recorded in the station log for FCC accounting and customer billing purposes. Long distance communications. The output of a switcher that allows you to observe an effect before it is placed on-air. A test of transmission capability in which a signal is transmitted through a loop that returns the signal to the source. The test verifies the ability of the source to transmit and receive.loop-through (loop-thru, looping)
A type of video input circuit that provides two or more input connectors. One connector accepts the video input signal for use within the device in question, and the other connector provides a tap off of the input for routing the input signal to another piece of equipment. 1. The amount of anticipated signal loss over a given fiber optic path, including attenuation, connector loss, splice loss, and other losses. 2. The amount of signal loss fiber optic transmission equipment can sustain before exceeding the operating specifications.low frequency chrominance response
A TV picture anomaly in which a change in time (1 microsecond to 60 microseconds) causes a change in chrominance amplitude. The picture shows unwarranted saturation variations from left to right. A filter network that passes all frequencies below a specified frequency with little or no loss but that discriminates strongly against higher frequencies. Dim lighting of a control panel button. Usually indicates that a source or function is selected but not currently on air. Least significant bit. The bit that has the lowest value in a binary number or data byte. Large scale integration. Luminance. The measurable, luminous intensity of a video signal. Differentiated from brightness in that the latter is non-measurable and sensory. The color video picture information contains two components: luminance (brightness and contrast) and chrominance (hue and saturation). The photometric quantity of light radiation. A non-color, luminance-only fill video for key borders and drop shadows. A key effect in which the portions of a key source that are greater in luminance than the clip level cut a hole in the background video. A TV picture anomaly in which a change in luminance amplitude causes a change in luminance gain. The picture shows poor resolution between brightness levels in the nonlinear range.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.
