1. Amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK) are digital modulation schemes. ASK refers to a type of amplitude modulation that assigns bit values to discrete amplitude levels. The carrier signal is then modulated among the members of a set of discrete values to transmit information.
2. . Amplitude Shift Keying (ASK). Frequency Shift Keying (FSK). Phase Shift Keying (PSK) Q2. Why PSK is preferred as the modulation technique in modems? Ans: In PSK scheme it is possible to send a signal having more than one digital value. The approach is known as Quadrature PSK.

81. In QAM, both phase and ________ of a carrier frequency are varied.
a. Frequency
b. Bit rate
c. Amplitude
d. Baud rate

This post discusses Digital Modulation Techniques (ASK, FSK and PSK). The Waveforms, Definition and Basic Concepts of each digital modulation Techniques are discussed here. You will find here the basic difference between digital modulation and analog modulation. The digital modulation techniques are amplitude shift keying (ASK), frequency shift keying (FSK) and Phase shift keying (PSK).

82. Which of the following is most affected by noise?
a. PSK
b. FSK
c. QAM
d. ASK

83. ASK, PSK, FSK, and QAM are examples of ________ modulation.
a. Analog-to-analog
b. Analog-to-digital
c. Digital-to-digital
d. Digital-to-analog

84. If the baud rate is 400 for a 4-PSK signal, the bit rate is ________ bps.
a. 1600 100
b. 800
c. 400
d. 100

85. If the bit rate for an ASK signal is 1200 bps, the baud rate is ________.
a. 300
b. 400
c. 600
d. 1200

86. As the bit rate of an FSK signal increases, the bandwidth ________.
a. Remains the same
b. Decreases
c. Increases
d. Doubles

87. In 16-QAM, there are 16 ________.
a. Phases
b. Combinations of phase and amplitude
c. Amplitudes
d. bps

88. Which modulation technique involves tribits, eight different phase shifts, and one amplitude?
a. FSK
b. ASK
c. 4-PSK
d. 8-PSK

89. If the bit rate for an FSK signal is 1200 bps, the baud rate is ________.
a. 300
b. 400
c. 600
d. 1200

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90. If the bit rate for a QAM signal is 3000 bps and a signal unit is represented by a tribit, what is the baud rate?
a. 300
b. 400
c. 1000
d. 1200

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