5.Analog Transmission

In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant

• PSK
• ASK
• FSK
• QAM

How many carrier frequencies are used in BPSK?

• 0
• 1
• 2
• none of the above

The constellation diagram of 16-QAM has ______ dots.

• 4
• 8
• 16
• none of the above

AM and FM are examples of ________ conversion.

• analog-to-analog
• digital-to-digital
• analog-to-digital
• digital-to-analog

The Federal Communications Commission (FCC) allows ______ kHz for each FM station.

• 20
• 100
• 200
• none of the above

Analog-to-analog conversion is needed if the available bandwidth is _______.

• band-pass
• low-pass
• either (a) or (b)
• neither (a) nor (b)

In _____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal. The peak amplitude and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly.

• AM
• FM
• PM
• none of the above

How many carrier frequencies are used in QPSK?

• 0
• 2
• 1
• none of the above

Which of the following is not a digital-to-analog conversion?

• FSK
• ASK
• AM
• PSK

_______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.

• Analog-to-analog
• Digital-to-digital
• Digital-to-analog
• Analog-to-digital