C. Phase reversalD. Modulator's sensitivity factor39. In linear modulation, the intelligent signal isconveyed inA. The amplitude of the transmitted signalBA The sideband components of thetransmitted waveC. The phase deviation modulated signalD. None of the above| 40. What communication technique ormodulation scheme make use of channelnoise as an added advantage?A. Asynchronous shift key modulationB. Vestigial sideband modulationC. Spread-spectrumD.4 Wideband Frequency modulation|41. Narrowband FM and AM share a lot ofsimilarities except that ,A+ The lower side frequencies are 180° outof phase.B. The upper side frequencies are 180° outof phase.C. The sideband frequencies are 180° out ofphase.D. None of the above| 42. Modulation is done in ,A. TransmitterB. Radio receiverC. Between transmitter and radio receiverD. None of the above|43. At 100 % modulation, the power in eachsidebands is,A 50 %В. 40 %С. 60 %D 25 %| 44. In a TV transmission, picture is32. Let x(1), y(1) be signals with maximumfrequency f,. f;respectively. Find theminimum sampling required to perfectlyreconstruct z(t) = x(t)+ y(t)A. 2(f,+f;)B. 2 max ( f,. fa)C. 2 min (f,. fa)D. None of the above33. In digital communication, the blockresponsible for converting the informationsource into a binary form is _A. Channel encoder :B. Digital modulatorC. Source encoderD. Channel decoder34. Distortion caused by over-modulationproducesA. Inter-symbol interferenceB. Channel interferenceC+ AttenuationD. None of the above35. To effectively detect the envelope of anDSB-FC wave one of the conditions belowshould be satisfied.A. A, «A.B. f. =f, and =0C. f„>f.DA W«f,36. Digital signals .A. Do not provide a continuous set ofvalues_of that of carrier.B? Present values as discrete stepsC. Can utilized decimal or binary systemsD. All of the above37. The frequency spectrum of an DSB-PCcontains the following exceptA. A'component at fcB. Sidebands at f,+f, and f,- f.Ca Sidebands at f, ±inf_in = 1, 2, ...modulated.A. FrequencyB. PhaseC* AmplitudeD. None of the aboveD. A and C38. The percentage of the total power of themodulated signal that conveys information iscalledAA Power efficiencyB. Percentage modulation45. Given a sine wave modulating signal, PMmodulated wave appears to be frequencymodulated by cosine modulating wave.A. TrueB. False

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32. Let x(1), y(1) be signals with maximum frequency f,. f, respectively. Find the minimum sampling required to perfectly reconstruct z(t) = x(1)+ y(t) A. 2(5,+f,) B. 2max (f,. 1,) C. 2 min (f,. fa) D. None of the above

32. Let x(1), y(1) be signals with maximum frequency f,. f, respectively. Find the minimum sampling required to perfectly reconstruct z(t) = x(1)+ y(t) A. 2(5,+f,) B. 2max (f,. 1,) C. 2 min (f,. fa) D. None of the above

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A carrier signal is amplitude modulated by a sinewave. The resulting AM waveform is shown below. 3.5V- 1V- a) What is the amplitude of the carrier signal? b) c) To achieve 75 percent modulation, what amplitude of the modulating signal is needed? d) Calculate the effective voltage of the AM signal What is the modulation index?
what happens when the modulation order is increased for a modulated signal?
Question 4 (a) A carrier and a modulating signals are shown in Figure 2. Sketch and label the modulated output signal in time domain for: i. the Frequency Modulation (FM) i. the Phase Modulation (PM). Carrier signal Modulating signal Figure 2 (b) The FM and PM modulators parameters are shown in Table 1. Table 1 FM modulator Deviation sensitivity 6 kHz/v Carrier frequency = 400 kHz Modulating signal = sin (2n 4 kr) PM modulator Deviation sensitivity 1.6 rad/v Carrier frequency = 300 kHz Modulating signal = 1.25 sin (2n 5 kr) i. Calculate the modulation indexes for both modulators. i. Sketch and label the frequency spectrum for both modulators.
Q: Explain in details with all figures and equations the modulation index of Amplitude Modulation (AM) and then show the AM wave when the modulation index > 1 , modulation index < 1 and modulation index =1.choose the best case and why.
According to the figure below determine the following 1. What is the name of this type of modulation - 2. Determine the modulation index 3. Determine the amplitude of carrier and the amplitude of information signals 4. Write down the mathematical form of the signal assume the carrier frequency 10 MHz and information frequency 1 KHz. 5. If we want change the modulation index to be 1, how would your answer to parts three & four change? Amplitude 1.5 0.5 -0.5
In an Amplitude Modulator where the carrier and modulating signals are both sine waves, the frequency spectrum of the resulting AM signal is shown below. 12V 2V 2V kHz 803 808.6 a) Determine the equation of the modulating signal b) Calculate the bandwidth of the AM signal c) Calculate the effective current of the AM signal thru a 75-ohm load. d) Sketch the AM wave and label the maximum and minimum voltage of the signal.
With the aid of diagrams, show and explain how phase locking is used to demodulate a frequency-modulated (FM) signal.
3. The role of mixer in the Armstrong modulator is to. a) raise the carrier frequency b) lower the carrier frequency c) to change the carrier frequency to any required value For AMDSB-SC, The carrier is suppressed using a) A mixer b) A frequency multiplier c) A balance modulator 5. In FM modulation, frequency deviation is equal to .........., if the amplitude of the modulating signal is 4 V, and the frequency sensitivity of the modulator is 30 Hz/V. a) 120 Hz b) 34 Hz c) 100 Hz 6. A voltage controlled oscillator (VCO) is an oscillator that its frequency output is varied according to any change in the ............... at its input. 4. a) Frequency b) Current c) Voltage Q1: (B) Draw A block diagram to generate the SSB using Hilbert Transform method, Write an equation for an input, and output signals?
Q: Explain in details with all figures and equations the modulation index of Amplitude Modulation (AM) and then show the AM wave when the modulation index > 1 , modulation index < 1 and modulation index =1.choose the best case and why.1-draw the three cases.2-write an example.
The modulation index of the PM signal is 2. If a modulating signal that has amplitude of 50 mV at a frequency of 3 kHz phase modulates a 90 kHz carrier signal, what would be the new modulation index of the signal? Assume that the amplitude of the modulating signal is increased by 50%.
then second questrion po eh eto 2. Determine the over-all transmittance of the signal flow graph shown below.
b) Draw the block diagram of the phase - locked loop (PLL) that can be used to demodulate FM signals. Explain briefly . the operation of this demodulator