FM
Follow Spot
Full Duplex
Frequency
Frequency Response
Directing separate takes or scenes that are to be later edited in postproduction. These takes or scenes are not necessarily in the same sequence as they will appear in the film or tape. Frequency Modulation. A method of adding audio to a radio frequency carrier. FM signals are usually more noise free than amplitude modulation (AM) signals. Wireless intercom units usually use FM.
Used to accent or light action on stage, the follow spot is a focused high power light that focuses a beam from a large circle to a small spot. The operator of the follow spot is usually on the lighting intercom line, and sometimes in small productions on the primary intercom line. The follow spot operators have been known to tape their beltpack to the spotlight or a nearby metal structure. This practice can cause hum and noise in the intercom line because of the large currents involved in lighting. Some of the currents are induced into the metallic structure of the facility causing large “ground” currents. If a belt pack is to be taped to something, a layer of tape should be put around the belt pack first to insulate it from any metal. The newer BP325 has a nonmetallic case, so adding tape to the case is unnecessary, but it is necessary to prevent contact of connector shells and other metal objects with ground or metallic structures.
A communications system where the path is different for talk and listen. In electrical pathways there are, in fact, four wires (two paths).
A
Duplex communication allows simultaneous
The number of times per second a periodic action occurs. Frequency is measured in Hertz (formerly cycles per second).
The range of useful frequencies for a particular device, circuit, or system. For example: a microphone frequency response of 20 Hertz to 20,000 Hertz ±3 dB would be considered excellent. The design goal of the TW system is 75 Hertz to 20,000 Hertz (system), 75 Hertz to 10,000 Hertz (microphone preamplifier), and 75 Hertz to 8,000 Hertz (headphone/speaker amplifiers). The response on an actual system will vary according to the amount of cable in the system, various
G
Gain
GND
GPIO
1.Level of amplification for audio/video signals. Operators may need to periodically adjust these levels during production (especially those gain controls on the audio mixer board). 2. An important parameter of a functional block or a circuit device. The gain is the output voltage divided by the input voltage, the output current divided by the input current, or the output power divided by the input power. For example: a microphone preamplifier in a TW user station may have a maximum gain of 54 dB (a voltage ratio of 500). Note that, in the case of the bilateral current source, it is a voltage controlled current source, and is characterized not by gain, but by transconductance. Transconductance is given by the output amperes divided by the input volts. The units of transconductance are siemens (formerly the units were mhos). The bilateral current source used in RTS™ Systems user stations usually has a transconductance of 5 milliamperes divided by 1.5 volts or 3.3 millisiemens.
An abbreviation for ground.
General Purpose Input / Output. (You may also see this referred to simply as “GPI”.) GPIO is a means of controlling devices using switch contact closures, DC voltages, or similar methods. For example: you can control a lighting system from keypanel keys, or key a transmitter from a talk key during transmit. Or, simply operate a light or buzzer for cueing. In ADAM™, ADAM™ CS,
