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Glossary of Terms
Audible - A sound that we can hear, generally in the 20 Hz - 20 kHz
frequency range.
BNC - Short for “British Naval Connector.” A standard RF antenna
connector used by many wireless receivers, including the Samson UR-4.
Carrier - An inaudible high-frequency radio signal that is continuously
modulated by an audible signal (it therefore is said to “carry” the audible
signal).
Channel - In wireless transmission, refers to a particular radio frequen-
cy.
Demodulation - In FM transmission, the process of removing the carrier
signal and thereby restoring the original audible signal.
Frequency - Refers to the number of wavecycles occurring per second.
Audible frequencies are in the range 20 Hz - 20 kHz; radio frequencies
are considerably higher.
Frequency Modulation (FM) - A form of radio transmission by which the
frequency of a carrier signal is continuously modulated by the audible
signal to be transmitted. A receiver then demodulates the signal by
removing the carrier signal so that the original audible signal is restored.
Group - In wireless transmission, refers to a selected set of radio fre-
quencies.
Headset - A “hands-off” microphone worn with a headband.
Hertz (Hz) - A unit of frequency measurement denoting one wavecycle
per second.
Inaudible - A sound that we cannot hear. Radio waves (which have fre-
quencies ranging from the tens of thousands to millions of waves per
second) are all inaudible.
KiloHertz (kHz) - A unit of frequency measurement denoting one thou-
sand wavecycles per second.
Ladder - Refers to a multi-segment meter, where the number of seg-
ments that light are proportional to the strength of signal.
Lavalier - A “hands-off” clip-on mini-microphone.
MegaHertz (mHz) - A unit of frequency measurement denoting one mil-
lion wavecycles per second.
Modulation - The process by which one signal is continuously affected
by another. The Samson UHF Series system utilizes frequency modula-
tion, whereby the frequency of a carrier signal is continuously modulated
by the audible signal to be transmitted.
Noise Reduction - A process by which the level of extraneous noise or
hiss in a signal is reduced considerably. The Samson UHF Series
system utilizes the dbx® system of noise reduction.
