Chapter 3: Amplitude Modulation Fundamentals Flashcards
In _____________ the information signal varies the amplitude of the carrier sine wave.
Amplitude modulation
An imaginary line called the ______ connects the positive and negative peaks of carrier waveform.
Envelope
The peak value of the modulating signal be _______ than the peak value of the carrier.
Less than
________ occurs when the amplitude of the modulating signal is greater than the amplitude of the carrier.
Distortion
The ___________ is a value that describe the relationship between the amplitude of the modulating signal and the amplitude of the carrier signal.
Modulation index(m)
m= Vm/Vc
The modulation index should be a number between _______.
0 and 1
If m will be greater than 1 then?
It will cause distortion.
formula for Vm.
Vm = Vmax - Vmin / 2
formula for Vc.
Vm = Vmax + Vmin / 2
This are generated as part of the modulation process and occur in the frequency spectrum directly above and below the carrier.
Sidebands
A ______ is used to display the frequency domain as a signal.
Spectrum analyzer
When complex signals such as pulses or rectangular waves modulate a carrier, a broad spectrum of sidebands is _______.
Produced
Amplitude modulation by square waves is referred to as __________________.
Amplitude shift keying
Transmission can be achieved by turning the carrier off and on as in Morse code transmission.
Continuous wave
Continuous wave transmission is sometimes referred to as _________________________.
On Off keying
