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Agilent Spectrum Analysis Ampl
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大小:1249 |
2010-07-08
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Modulation is the act of translating some low-fre-
quency or baseband signal (voice, music, and data)
to a higher frequency. Why do we modulate signals?
There are at least two reasons: to allow the simulta-
neous transmission of two or more baseband signals
by translating them to different frequencies, and to
take advantage of the greater efficiency and smaller
size of higher-frequency antennae.
In the modulation process, some characteristic of
a high-frequency sinusoidal carrier is changed in
direct proportion to the instantaneous amplitude
of the baseband signal. The carrier itself can be
described by the equation:
quency or baseband signal (voice, music, and data)
to a higher frequency. Why do we modulate signals?
There are at least two reasons: to allow the simulta-
neous transmission of two or more baseband signals
by translating them to different frequencies, and to
take advantage of the greater efficiency and smaller
size of higher-frequency antennae.
In the modulation process, some characteristic of
a high-frequency sinusoidal carrier is changed in
direct proportion to the instantaneous amplitude
of the baseband signal. The carrier itself can be
described by the equation:
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