Q6. Figure Q6 shows the line spectrum of a modulated signal (all components are positive and real). 1 232 234 236 238 frequency/kHz Figure Q6: Line spectrum of a modulated signal (a) Describe the modulation scheme. (b) What are the values of the carrier frequency, modulation frequency and the modulation index? (c) What is the transmission efficiency (ratio of modulated to total power) in this example? Relative units 2.

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Q6. Figure Q6 shows the line spectrum of a modulated signal (all components are positive and
real).
3
1
232
234
236
238
frequency/kHz
Figure Q6: Line spectrum of a modulated signal
(a) Describe the modulation scheme.
(b) What are the values of the carrier frequency, modulation frequency and the modulation
index?
(c) What is the transmission efficiency (ratio of modulated to total power) in this example?
(d) The reception of this signal is undertaken with a superheterodyne detector using an
intermediate frequency of 110 kHz. What is the appropriate local oscillator frequency?
(e) Demodulation of this type of signal is usually accomplished using an envelope detector.
Describe the principles of operation of an envelope detector and sketch an example
circuit.
(f) What considerations should be made about the component values in the design of an
envelope detector in order to demodulate the signal after shifting to the intermediate
frequency?
Relative unitsS
Transcribed Image Text:Q6. Figure Q6 shows the line spectrum of a modulated signal (all components are positive and real). 3 1 232 234 236 238 frequency/kHz Figure Q6: Line spectrum of a modulated signal (a) Describe the modulation scheme. (b) What are the values of the carrier frequency, modulation frequency and the modulation index? (c) What is the transmission efficiency (ratio of modulated to total power) in this example? (d) The reception of this signal is undertaken with a superheterodyne detector using an intermediate frequency of 110 kHz. What is the appropriate local oscillator frequency? (e) Demodulation of this type of signal is usually accomplished using an envelope detector. Describe the principles of operation of an envelope detector and sketch an example circuit. (f) What considerations should be made about the component values in the design of an envelope detector in order to demodulate the signal after shifting to the intermediate frequency? Relative unitsS
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