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Dictionary of Technical Terms - R
reference synchronizing generator
A sync pulse generator used as the main source of synchronizing signals. Other sync generators may be slaved (derive their signals) from the reference generator. A composite video signal to which other signals are compared or locked for timing purposes. Relating to fiber optics, the ratio of the velocity of light in a vacuum to its velocity in a material, such as an optical fiber. regenerator. In video, to restore a pulse to its correct shape and level. A memory storage location in an effects memory system. Ratio of the quantity of water vapor in the atmosphere to the quantity which would cause saturation at the existing temperature. An electromechanical device having electrical contacts that open or close when current is applied to the activating mechanism of the device. A video device that, in the event of a power failure, routes the video signal around the equipment that has lost power. GVG's 3240-206 Relay Bypass Module is an example. Control buttons that are designed to allow the user to change their designations (the name on the button). Electronic signal transmitted from a distant location. A mobile truck or van that houses a broadcast switching and control center for broadcasting news or sports. 1. A receiver/transmitter that receives a signal from another transmitter and relays (retransmits) it to another receiver or a receiver/transmitter. 2. In fiber optics, a device that converts a received optical signal to its electrical equivalent, reconstructs the source signal format, amplifies and reconverts it to an optical output signal. The purpose is to restore the light amplitude, compensating for normal loss in fiber. To restore a device to its default or original state. To restore a counter or logic device to a known state, often a zero output. A load in which the voltage is in phase with the current. A component made of a material (such as carbon) that has a specified resistance or opposition to the flow of electrical current. Detail. In digital video and audio, the number of bits (four, eight, ten, etc.) determines the resolution of the digital signal. Four bits yields a resolution of 1 in 16. Eight bits yields a resolution of 1 in 256. Ten bits yields a resolution of 1 in 102 4. Eight bits is the minimum acceptable for broadcast television. See frequency response. A measure of the sensitivity of a photosensor. The ratio of the output current or voltage to the input flux in watts or lumens. When responsivity is indicated at a particular wavelength (in amperes/watt), it denotes the spectral response of the device. See DC restoration. Adjustment of a local synchronizing generator that has been locked to a distant source. This permits the local facility to use the distant source in real-time production through a video switcher. The return of the electron beam in a CRT to the starting point after scanning. During retrace, the beam is typically turned off. All of the sync information is placed in this "invisible" portion of the video signal. May refer to retrace after each horizontal line or after each vertical scan (field).
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