unmodulated - ορισμός. Τι είναι το unmodulated
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Τι (ποιος) είναι unmodulated - ορισμός

RANGE OF FREQUENCIES OCCUPIED BY AN UNMODULATED SIGNAL
Baseband technology; Baseband signal; Low-pass equivalent; Equivalent baseband signal; Equivalent lowpass signal; Baseband equivalent signal; Baseband Signal; Base band; Baseband signaling; Baseband channel; Equivalent baseband model; Baseband transmission
  • Comparison of the equivalent baseband version of a signal and its AM-modulated (double-[[sideband]]) RF version, showing the typical doubling of the occupied bandwidth.
  • IQ modulation and demodulation

unmodulated      
¦ adjective not modulated.
baseband         
A transmission medium through which digital signals are sent without frequency shifting. In general, only one communication channel is available at any given time. Ethernet is an example of a baseband network. See also broadband. (1995-02-22)
Baseband         
In telecommunications and signal processing, baseband is the range of frequencies occupied by a signal that has not been modulated to higher frequencies.Jeff Rutenbeck, Tech Terms: What Every Telecommunications and Digital Media Professional Should Know, p.

Βικιπαίδεια

Baseband

In telecommunications and signal processing, baseband is the range of frequencies occupied by a signal that has not been modulated to higher frequencies. Baseband signals typically originate from transducers, converting some other variable into an electrical signal. For example, the electronic output of a microphone is a baseband signal that is analogous to the applied voice audio. In conventional analog radio broadcasting, the baseband audio signal is used to modulate an RF carrier signal of a much higher frequency.

A baseband signal may have frequency components going all the way down to DC, or at least it will have a high ratio bandwidth. A modulated baseband signal is called a passband signal. This occupies a higher range of frequencies and has a lower ratio and fractional bandwidth.