RADIO FREQUENCY (RF)
REAR PROJECTION
REAR PROJECTION TV
RECLOCKING
RELAY
REMOTE CONTROL
REMOTE SOCKET
RETURN LOSS
RF AMPLIFICATION
RF CONVERSION
RF DISTRIBUTION
RF MODULATION
RFI
RGB (Red/Green/Blue)
RISE TIME
RJ-45
RS-170/170A
RS-232/RS-422
RS-485
RADIO FREQUENCY (RF)
(рус. РЧ)
A term used to describe radio signals incoming to a receiver or outgoing from a radio transmitter (above 150 kHz). Even though they are not really radio signals, TV signals are also included in this category.
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REAR PROJECTION
A process for projecting video and data from the rear side of the screen in order to keep a clear line of view for the audience. The projected image is inverted, and is projected on a special translucent screen.
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REAR PROJECTION TV
A large TV set with a big screen, with sizes varying between 32\''-60\'' allowing a big TV or video image to be displayed for a large audience. A powerful internal projector projects an inverted image on the rear side of the screen via a set of mirrors. When projection TVs were first introduced, the image was dim and was viewable at a narrow viewing angle only. As technology progresses, images are becoming clearer and brighter and can be viewed at almost any angle.
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RECLOCKING
A process used in Serial Digital communication to reduce signal jitter (usually a result of long cable runs) on the signal. By Reclocking at adequate intervals, and rebuilding the stable, original signal clock, jitter can be completely overcome. In the analog world, Time Base Correction using a TBC performs a similar task.
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RELAY
(рус. Реле)
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REMOTE CONTROL
A process or instrument for controlling an electronic device from a remote location. The remote control unit can be wired to the controlled device by cable, or it can control the device by transmission – either infrared or RF based.
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REMOTE SOCKET
A small socket on a VCR or video camera which permits remote control from any unit which is connected to it. Through the remote socket on a VCR, commands such as Play, Pause and Record can be initiated.
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RETURN LOSS
When energy is reflected in a cable, between a signal source and an acceptor (see Cable reflection), the amount of energy reflected is called the return loss and is measured in decibels. Return loss depends on frequency, load and cable length.
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RF AMPLIFICATION
Amplification of a signal by a receiver before processing or transmission. An RF signal is frequently attenuated during processing due to hostile environments (high capacitance, improper loading, etc.). To avoid such losses, RF amplification is performed before the signal is transmitted. RF amplification is also needed when an RF signal, coming from an RF modulator, is distributed to several acceptors simultaneously.
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RF CONVERSION
A process which takes low frequency signals such as audio and video and, via an RF modulator, converts them to higher (broadcast) frequencies suitable for radio or TV reception.
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RF DISTRIBUTION
The process of supplying an RF signal to several acceptors simultaneously. During RF distribution, RF amplification and proper input and output matching should be performed in order to avoid signal losses.
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RF MODULATION
See RF Conversion.
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RFI
Radio Frequency Interference. An electrical interference generated by some electronic or electric devices appearing in the radio frequency range. The RFI should be controlled and suppressed in order be approved by the authorities.
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RGB (Red/Green/Blue)
The basic constituents of a color video signal. By using a color encoder, in conjunction with sync information, a complete composite video signal comprising luminance, chrominance and sync can be generated. Professional processing equipment always employs RGB signals for editing and processing. The use of component video, of which RGB is one form, results in superior quality output.
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RISE TIME
A parameter indicating the speed and frequency response of an amplifier or of a processing stage in an electronic circuit. Rise Time is the time it takes a signal to change its level from 10% to 90% of the maximum amplitude. The shorter this time, the faster the amplifier. Shorter Rise Time indicates better high frequency response.
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RJ-45
Registered Jack 45. A connector type which can handle up to 8 wires (or 4 twisted pair wires), mainly used for Ethernet / PC network applications.
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RS-170/170A
RS-170 is the American standard used for black and white TV that defines video signal parameters - Sync, Blanking and signal levels. RS-170A is a revision of RS-170, allowing color transmissions and video use.
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RS-232/RS-422
Communication methods between computers and video equipment that are hardware based and software controlled. In the computers, RS-232 is carried through the serial port to another serial port, where the data streams serially between the computer and its peripherals - mouse, plotter, printer, etc. In the computer field there is usually a handshake protocol between the ports that operate bi-directionally. Video equipment can be controlled by either RS-232 or by RS-422 system, and as the RS-422 method connects several devices on the same line in parallel in a simple way, it is more popular in the video market. Computer controlled VCRs, editing controllers, switchers and other studio equipment are found in most video studios. In order to successfully link two pieces of hardware, they must use the same communication protocol.
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RS-485
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