ME365chap10_modul

ME365chap10_modul - KARTIK B ARIYUR PURDUE UNIVERSITY...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: KARTIK B. ARIYUR PURDUE UNIVERSITY Modulation • Modulation - Carrier Systems • Amplitude Modulation • Demodulation 1 Modulation KARTIK B. ARIYUR PURDUE UNIVERSITY Modulation - Carrier Systems • Modulation – Using a low frequency or base-band signal (voice, distance measurement, …) to modify a high frequency carrier signal . – Advantages: • 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 2 Modulation KARTIK B. ARIYUR PURDUE UNIVERSITY Modulation - 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 ). Carrier signal: V ( t ) = V C sin( w C t + f ) where: V C = Carrier amplitude w C = Carrier frequency (rad/sec) f = Carrier phase at t = 0 sec. – Three properties can be changed: • AM (A mplitude M odulation): changes the amplitude ( V C )....
View Full Document

This note was uploaded on 04/23/2011 for the course ME 365 taught by Professor Merkle during the Spring '07 term at Purdue.

Page1 / 14

ME365chap10_modul - KARTIK B ARIYUR PURDUE UNIVERSITY...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online