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Dictionary of Technical Terms - D
DCC-45 DS3 Digital Cross-Connect Switch
A Grass Valley DS3 digital switching system for video, audio, voice, or T1 or other data. A type of connector that has a trapezoidal shell resembling a D. A method of coupling one circuit to another so as to transmit the static (DC) characteristics of the signal as well as the varying (AC) characteristics. Any DC offset present on the input signal is maintained and will be present in the output. Some GVG distribution amplifiers may be set for true DC coupling. This method of coupling is the preferred mode for component analog video signals, particularly Y, R-Y, B-Y, which has negative-going energy in the R-Y and B-Y channels. The amount that the DC component of the signal has shifted from its correct level. The absolute DC value of the blanking signal's voltage. The re-establishment of the DC and low-frequency components of a video signal which have been lost by AC transmission. Overshoot of the proper DC voltage level due to multiple AC couplings in a signal path. Discrete cosine transform. A mathematical transformation used in many compression technologies. Digital disk recorder. See disk recorder. Digital Data Service. See trail. A device used to recover the component signals from a composite (encoded) source. Decoders are commonly used in monitors and receivers for recovery of RGB signals to drive a color picture tube.
digital parallel distribution amplifier
A distribution amplifier designed to amplify and fan-out parallel digital signals.digital picture manipulator (DPM)
A GVG term for digital video effects systems which can manipulate a video picture to change its size, shape, angle, etc. A device that converts digital signals to analog signals.digitizing pad (digitizing tablet)
A device that translates drawings from a tablet and stylus to a digital video format. The number of bits treated as a single entity by the system. 1. A temporary, usually major, reduction in the level of audio output to monitor speakers. 2. In digital picture manipulators, an effect where the manipulated image tapers off to black or into the background picture. Dual in-line package switch. A pc module mounted switch package of dual in-line style, typically mounting from two to eight switches and used in such functions as mode assignment and address selection.director
The person who coordinates all aspects of a live television broadcast from within the control room.
Having an individual identity. An individual circuit component. A discrete circuit is one that uses individual transistors and other components rather than integrated circuits. A video recording device that uses a hard disk drive or optical disk drive mechanism. Disk recorders offer nearly instantaneous access to recorded material. The characteristic of a light-conducting medium that causes the medium to transmit light of different frequencies at different velocities. Dispersion causes the refractive index of a given medium to vary as a function of wavelength. As it relates to optical fiber, this property influences both the effective numerical aperture and the bandwidth of an optical fiber. In optical telecommunications, the pulse spreading of an optical signal that takes place when it is transmitted over optical fiber. This effect is caused by the fiber's differing material index of refraction at the various wavelengths present in the optical signal. A transition where one source of video or audio is faded down as the other is faded up. See also effects dissolve. Undesired changes in the waveform of a signal. A device used to replicate an input signal, typically providing 6 outputs, each of which is identical to the input. May also include delay and/or cable equalization capabilities. Typically, a random, low-level signal (oscillation) which may be added to an analog signal prior to sampling. Usually consists of white noise of one quantizing level peak-to-peak amplitude. A slight expansion of the analog signal levels so that the signal comes in contact with more quantizing levels. The results are smoother transitions. This is done by adding white noise (which is at the amplitude of one quantizing level) to the analog signal prior to sampling. The communications path from a satellite to its ground station or from a transmitter to a studio. Occurring after other devices in a signal path. A keyer that inserts the key after the effects system video output. This enables the key to remain on-air while the backgrounds and effects keys are changed behind it. Digital Picture Manipulator. The GVG term for video equipment that performs digital effects such as compression and transformation. Gradual shift or change in the output over a period of time due to change or aging of circuit components. Change is often caused by thermal instability of components.drive pulse(s) (pulse drives, drives)
A term commonly used to describe a set of signals needed by source equipment, such as a camera. This signal set may be composed of any of the following: sync, blanking, subcarrier, horizontal drive, vertical drive, PAL pulse, and burst flag. An electronic circuit which supplies input to another electric circuit. SMPTE time code format that continuously counts 30 frames per second but drops 2 frames from the count every minute except for every tenth minute (drops 108 frames every hour) to maintain synchronization of time code with clock time. This is necessary because the actual frame rate of NTSC video is 29.94 frames per second rather than an even 30 frames. See non-drop frame time code. A momentary loss or deterioration of video or audio during playback on a tape machine. Caused by momentary loss of tape contact with the playback head or by flaws in the tape. A circuit within a videotape recorder that detects dropouts and replaces them with information from the previous scan line. A Borderline(R) mode which places a border below and on one side of a title key insert, giving a shadow effect. Digital signal level zero, 64 kbps. A telephone company format for transmitting information digitally. DS1 has a capacity of 24 voice circuits at a transmission speed of 1.544 megabits per second. A telephone company format for transmitting information digitally. DS3 has a capacity of 672 voice circuits at a transmission speed of 44.736 megabits per second. Downstream keyer. Dual-tone multifrequency signaling. Digital termination system. To copy a video signal to tape. To copy one tape to another. A copy of a videotape (noun). A manufacturer of sophisticated video graphic workstations, character generators, and still stores. Now merged with Grass Valley Group. A computer display terminal that serves as a conversational slave to a host computer. Has a keyboard for data entry but no computing power of its own. 1. The ratio of operating time to total elapsed time of a device which operates intermittently, expressed in percent. 2. The ratio of the active time of a repetitive waveform to the full-cycle time, expressed in percent. Digital video effects. A registered trademark of Nippon Electric Company. Refers to video equipment that performs digital effects such as compression and transformation. Digital videotape recorder. A 1/2" composite digital video tape format.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.
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