EE 314 Notes 3 Amplitude Modulation
In Amplitude Modulation, the amplitude of a carrier is varied linearly
with the amplitude of the message (baseband) signal.
Baseband signals are low-pass signals occupying a range of frequencies
from zero to the signal
EE 314 Notes 5: SSB and VSB
1. The carrier is not transmitted.
2. Transmits only one sideband (half the bandwidth of DSB-SC or AM).
3. SSB synchronous detection is less sensitive to phase and frequency errors
4. By adding a carrier at
EE 314 NOTES - 7
INTRODUCTION TO ANGLE MODULATION
In angle modulation, the frequency or phase of a carrier, or a combination of
both, is varied in correspondence with a message signal.
An important advantage of angle modulation over amplitude
EE 341 Notes 4 DSB-SC & QAM
Double Sideband Suppressed Carrier (DSB-SC) AM
Double sideband system like AM it is wasteful of bandwidth.
Does not transmit the carrier unlike AM it has 100% power
Requires costly synchronous demodulation.
EE 314 NOTES # 1
Human voice, music, picture, data, etc.
Microphone, video camera, keyboard, scanner. Produces
baseband signal (or message signal).
Performs one or more of modulation, multiplexi
EE 314 Notes 2 (a)
Classification of Signals
Continuous or discrete time signals
Analog or digital signals
Periodic or aperiodic signals
Energy or power signals
Energy of a Signal:
| x(t ) |2 dt
| x(t ) |
Power of a Signal:
THE SUPERHETERODYNE AM RECEIVER
cfw_A + mm cos any!
f [A + "0 cos 9):!
RF amplier Frequency
with bandpass converter
tters tunabie (mixer)
yaw-e 4.23 Supeihetemdyne receiver.
The superheterodyne AM receiver is capabl