Set14 - Modulation Modulation Modulation Modulation...

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Unformatted text preview: Modulation Modulation Modulation Modulation Modulation - Carrier Systems Amplitude Modulation Demodulation ME365 Modulation Slide 1 Galen King Purdue University Modulation Modulation Modulation Modulation - Carrier Systems Carrier Systems Carrier Systems Carrier Systems Modulation Using a low frequency or base-band signal (voice, distance measurement, ) to modify a high frequency carrier signal . Advantages: elemetry signal transmission ME365 Modulation Slide 2 Galen Kingl Purdue University Telemetry signal transmission Multiplexing - multiple signals may be transmitted on the same channel. Capacitive or inductive devices require high frequency AC input (carrier) to operate. Stability and noise rejection Modulation Modulation Modulation Modulation - Carrier Systems Carrier Systems Carrier Systems Carrier Systems Types of Modulation In the modulation process, some characteristic of a high- frequency sinusoidal carrier signal, V ( t ), is changed in direct proportion to the instantaneous amplitude of the information (baseband) signal, x ( t ). ME365 Modulation Slide 3 Galen King Purdue University Carrier signal: V ( t ) = V C sin( C t + ) where: V C = Carrier amplitude C = Carrier frequency (rad/sec) = Carrier phase at t = 0 sec. Three properties can be changed: AM (A mplitude M odulation): changes the amplitude ( V C )....
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This note was uploaded on 12/26/2011 for the course ME 365 taught by Professor Merkle during the Fall '07 term at Purdue University-West Lafayette.

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Set14 - Modulation Modulation Modulation Modulation...

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