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Digital-to-analog conversion is discussed in 14 of [Pea92], 5 of [CouOl], and Section 52 of [Sta04] Analog-to-analog conversion is discussed in s 8 to 13 of [Pea92], 5 of [CouOl], and Section 54 of [Sta04] [Hsu03]
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gives a good mathematical approach to all materials discussed in this chapter More advanced materials can be found in [Ber96]
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frequency modulation (PM) frequency shift keying (FSK) phase modulation (PM) phase shift keying (PSK) quadrature amplitude modulation
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amplitude modulation (AM) amplitude shift keying (ASK) analog-to-analog conversion carrier signal constellation diagram digi tal-to-analog conversion
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Digital-to-analog conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data Digital-to-analog conversion can be accomplished in several ways: amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK) Quadrature amplitude modulation (QAM) combines ASK and PSK In amplitude shift keying, the amplitude of the carrier signal is varied to create signal elements Both frequency and phase remain constant while the amplitude changes In frequency shift keying, the frequency of the carrier signal is varied to represent data The frequency of the modulated signal is constant for the duration of one signal element, but changes for the next signal element if the data element changes Both peak amplitude and phase remain constant for all signal elements In phase shift keying, the phase of the carrier is varied to represent two or more different signal elements Both peak amplitude and frequency remain constant as the phase changes A constellation diagram shows us the amplitude and phase of a signal element, particularly when we are using two carriers (one in-phase and one quadrature) Quadrature amplitude modulation (QAM) is a combination of ASK and PSK QAM uses two carriers, one in-phase and the other quadrature, with different amplitude levels for each carrier Analog-to-analog conversion is the representation of analog information by an analog signal Conversion is needed if the medium is bandpass in nature or if only a bandpass bandwidth is available to us Analog-to-analog conversion can be accomplished in three ways: amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM) In AM transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal The frequency and phase of the carrier remain the same; only the amplitude changes to follow variations in the information In PM transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal The peak amplitude
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ANALOG TRANSMISSION
and phase of the carrier signal remain constant, but as the amplitude of the information signal changes, the frequency of the carrier changes correspondingly In PM transmission, the phase of the carrier signal is modulated to follow the changing voltage level (amplitude) of the modulating signal The peak amplitude and frequency of the carrier signal remain constant, but as the amplitude of the information signal changes, the phase of the carrier changes correspondingly
PRACTICE SET
Review Questions
1 Define analog transmission 2 Define carrier signal and its role in analog transmission 3 Define digital-to-analog conversion 4 Which characteristics of an analog signal are changed to represent the digital signal in each of the following digital-to-analog conversion
a ASK
b FSK
c PSK
d QAM
5 Which of the four digital-to-analog conversion techniques (ASK, FSK, PSK or QAM) is the most susceptible to noise Defend your answer 6 Define constellation diagram and its role in analog transmission 7 What are the two components of a signal when the signal is represented on a con- stellation diagram Which component is shown on the horizontal axis Which is shown on the vertical axis
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