Q1. In AM the envelope of themodulated signal waveform isalways symmetrical around the* time axisTrue OFalseQ2. In Amplitude Modulation, theinstantaneous values of thecarrier amplitude changes inaccordance withthe amplitude variations of themodulating signalthe amplitude and frequency variationsof the modulating signalthe amplitude of the carrier signal Othe amplitude and phase of modulatingsignal

Answered: Image /qna-images/answer/c44cb6f5-b945-4bd2-8c2d-2fdc2d2ea2a1.jpg

Q1. In AM the envelope of the modulated signal waveform is always symmetrical around the * .time axis True False Q2. In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with

Q1. In AM the envelope of the modulated signal waveform is always symmetrical around the * .time axis True False Q2. In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with

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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7) Suppose we have a message signal that is a sinusoid and we quantize it using a quantizer of L levels. Assuming that the quantization error for each sample is uniformly distributed in the interval , determine the signal to quantization noise ratio (SNR) in terms of L. Determine the SNR in terms of L if the message is changed to a triangular wave, again assuming that the errors are uniformly distributed.
Problem Amplitude modulation.,
What is the maximum transmission efficiency for amplitude modulation?
If the carrier frequency 1000hz and reference voltage =10 V with modulation Index 0.4 and modulation frequency 8. find output voltage and frequency?
The frequency deviation is the amount of change in carrier frequency produced by the modulating signal. Select one: O True O False
C. Phase reversal D. Modulator's sensitivity factor 39. In linear modulation, the intelligent signal is conveyed in A. The amplitude of the transmitted signal BA The sideband components of the transmitted wave C. The phase deviation modulated signal D. None of the above | 40. What communication technique or modulation scheme make use of channel noise as an added advantage? A. Asynchronous shift key modulation B. Vestigial sideband modulation C. Spread-spectrum D.4 Wideband Frequency modulation |41. Narrowband FM and AM share a lot of similarities except that , A+ The lower side frequencies are 180° out of phase. B. The upper side frequencies are 180° out of phase. C. The sideband frequencies are 180° out of phase. D. None of the above | 42. Modulation is done in , A. Transmitter B. Radio receiver C. Between transmitter and radio receiver D. None of the above |43. At 100 % modulation, the power in each sidebands is, A 50 % В. 40 % С. 60 % D 25 % | 44. In a TV transmission, picture is…
Problem1: the figure shows multiple modulation schemes for the signal that is given by the dashed line sinusoidal function, the X-axis is the time axis is seconds and the Y-axis is the amplitude. Answer the following: 1. What is the value of the duty cycle in A? 2.What is the quantization noise in a modulator that uses a 4-bits register for the analog to digital conversion of the given sinusoidal signal?
Problem1: the figure shows multiple modulation schemes for the signal that is given by the dashed line sinusoidal function, the X-axis is the time axis is seconds and the Y-axis is the amplitude. Answer the following: 1. What is the modulation scheme in A? 2. What is the modulation scheme in B? 3. What is the sampling frequency? 4. What is the value of the duty cycle in A?
Q7. Figure Q7 shows a modulated waveform v(t) in millivolts as a function of time t in nanoseconds. 1.5 1.0 0.5 - 0.0 -0.5 -1.0 -1.5 100 200 300 400 500 t/ns Figure Q7: Modulated waveform (a) Describe the modulation scheme. (b) What are the values of the carrier frequency and the modulation frequency? (c) What is the value of the modulation index? (d) What is the transmission efficiency (ratio of modulated to total power) in this example? (e) Sketch the spectrum of this modulated waveform indicating the relative magnitudes of the various spectral components. (f) Demodulation of this type of waveform is usually performed with an envelope detector. Describe the function of an envelope detector and sketch an example circuit. (g) What requirements on the values of the components of your envelope detector circuit are there for the successful demodulation of the given waveform? (h) Keeping the same carrier wave, the modulating wave in this example is substituted with a square wave of 50%…
A sinusoidally modulated AM waveform is shown below: Determine: a) Peak amplitude of the upper and lower side frequencies. b) Peak amplitude of the unmodulated carrier. The modulation index. The carrier power and the power in the sidebands. The total transmitted power. 3 0 -3 -9 The transmission efficiency. The amplitude of the carrier which must be added or subtracted to attain a modulation index of 0.5. In AM modulation, the modulation index is kept < 100%, why?
c) An audio signal 10sin 27(2000t) amplitude modulates a carrier 20sin 2π(200000t). i) ii) iii) d) How Sketch the amplitude modulated wave. Determine the modulation index? What is the frequency content of the modulated wave? AM broadenet stations. nodated in a 100 KH
‏In case of the amplitude modulation of an information signal A)the modulated signal has a single frequency which is the carrier frequency . B)the modulated signal has three components with the frequencies fc , fc + fm and fc - fm C). the modulated signal has a single frequency which is fm . D)none of the other answers is correct