OPTIMOD-FM DIGITAL
TECHNICAL DATA
6-15
FCC
Federal Communications Commission (USA regulatory agency)
FDNR
frequency-dependent negative resistor
⎯
an element used in RC-active filters
FET
field effect transistor
FFT
fast Fourier transform
FIFO first-in,
first-out
G/R gain
reduction
HD Radio
See IBOC
HF high-frequency
HP high-pass
IBOC
“In-Band On-Channel” — a form of digital radio commercialized by iBiquity Corporation
where the digital carriers use a form of COFDM modulation and share the frequency alloca-
tion of the analog carriers. Also known by its trademarked name of “HD Radio.”
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
PCM
pulse code modulation
PPM
peak program meter
RAM random-access
memory
RC resistor/capacitor
RDS/RBDS
Radio (Broadcasting) Data Service — a narrowband digital subcarrier centered at 57 kHz in
the FM baseband that usually provides program or network-related data to the consumer in
the form of text that is displayed on the radio. Occupied bandwidth is ±2500 Hz.
REF reference
RF radio
frequency
RFI radio-frequency
interference
RMS root-mean-square
ROM read-only
memory
SC subcarrier
SCA
subsidiary communications authorization
⎯
a non program-related subcarrier in the FM
baseband above 23 kHz (monophonic) or 57 kHz (stereophonic)
SMT surface-mount
S/PDIF
Sony/Philips digital interface (standardized as IEC958)
TRS
tip-ring-sleeve (2-circuit phone jack)
THD
total harmonic distortion
TX transmitter
μ
s
Microseconds. For FM pre-emphasis, the +3 dB frequency is 1 / (2
π
τ
), where
τ
is the pre-
emphasis time constant, measured in seconds.
Содержание OPTIMOD-FM 8600Si
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