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TECHNICAL DATA ORBAN MODEL 8685
dBu decibel voltage measurement. 0 dBu = 0.775V RMS. For this application, the dBm-into-
600Ω scale on voltmeters can be read as if it were calibrated in dBu.
DI digital input
DJ disk jockey, an announcer who plays records in a club or on the air
DO digital output
DOS Microsoft disk operating system for IBM-compatible PC
DSP digital signal processor (or processing). May also refer to a special type of microprocessor
optimized for efficiently executing arithmetic.
EBU European Broadcasting Union
EBS Emergency Broadcasting System (U.S.A.)
EMI electromagnetic interference
ESC escape
FCC Federal Communications Commission (USA regulatory agency)
FDNR
frequency-dependent negative resistor⎯an element used in RC-active filters
FPGA Field-programmable gate array
FET field effect transistor
FFT fast Fourier transform
FIFO first-in, first-out
G/R gain reduction
HF high-frequency
HP high-pass
IC integrated circuit
IM intermodulation (or “intermodulation distortion”)
I/O input/output
ITU International Telecommunications Union (formerly CCIR). ITU-R is the arm of the ITU dedi-
cated to radio.
JFET junction field effect transistor
LC inductor/capacitor
LCD liquid crystal display
LED light-emitting diode
LF low-frequency
LP low-pass
LVL level
MHF midrange/high-frequency
MLF midrange/low-frequency
MOD modulation
N&D noise and distortion
N/C no connection
OSHOOT overshoot
PC IBM-compatible personal computer running a Microsoft Windows® operating system
PCM pulse code modulation
PIC A family of small microprocessors often used for embedded systems
PPM peak program meter
RAM random-access memory
RC resistor/capacitor
REF reference
RF radio frequency
RFI radio-frequency interference
RMS root-mean-square
ROM read-only memory
SDI / HD-SDI serial data interface and high-definition serial data interface — a family of SMPTE stan-
dards allowing audio, video, and ancillary data to be multiplexed together and conveyed via
75 ohm coaxial cable or optical fiber at speeds up to 3 Gb/sec.
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