This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Elementary trigonometric relation: t t t t ) cos( 2 1 ) cos( 2 1 cos cos 2 1 2 1 2 1 + + = Using complex notations: 4. Double Side Band Amplitude Modulation: Notations for DSBSC AM (i.e. no carrier impulse/tone at carrier frequency): Equation Time domain Frequency domainMessage signal:Carrier:Modulation (message modulating carrier):Derivation of frequency spectrum: Bandwidth of 2W is required the signal. Two sidebands (upper and lower). Example: Consider modulation by the signal on a 1000 hertz carrier: ) 40 cos( 2 ) 20 sin( ) ( t t t m + = and ) 2000 cos( ) ( ) ( t t m t u = Time domain representations: Fourier transform of the message: Fourier transform of the modulated signal showing upper and lower sidebands:...
View
Full
Document
This note was uploaded on 11/01/2009 for the course EEE 455 taught by Professor Hui during the Spring '09 term at ASU.
 Spring '09
 Hui

Click to edit the document details