An FDM is used to multiplex two groups of signals using AM-SSB, the first group contains25 speech signals, each has maximum frequency of 4 kHz, the second group contains 15 musicsignals, each has maximum frequency of 10 kHz. A guard bandwidth of 500 Hz is used betweeneach two signals and before the first one.1. Find the BWmultiplexing2. Find the BWtransmission if the multiplexing signal is modulated using AM-DSB-LC.

Answered: An FDM is used to multiplex two groups…

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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Decoder circuit as shown in the following Figure. if A is LSB and C is MSB, the output expression F= YO Y Y, Y, D. Y. Decoder O a. B' O b. C O'c.B O d. C
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3- Suppose that on an AM signal, the Vmax Value read from the graticule on the oscilloscope screen is 5.9 divisions and Vmin is 1.2 divisions. What is the modulation index. Calculate Ec and Em.
3. Some GPS receivers use 1 bit ADCS (Analog-to-digital Converters) to sample and quantize the signal i.e. the output of the ADC is simply 2 quantization levels: -1 or +1. This is typically done to save on power. (a) What is the quantization SNR? How does it compare to typical thermal noise SNR of a GPS signal before correlating with the CDMA code? (b) Justify, how come it is possible to sample the signal using a single bit and still get good performance.
We want to design a digital circuit that converts Gray code (ABC) to Binary code (xyz). Set up a 8-to- 1 line multiplexer so that the output gives y as a function of ABC. "A" is given to the most significant bit of the control inputs of the multiplexer. "C" is given to the least significant bit of the control inputs of the multiplexer.
Pulse-code modulation (PCM) is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. Figure 3 shows the 3bit PCM system that transmit the 250 kHz analog signal with the voltage range from -6 mV to 6 mV. i) Identify the quantized value, voltage range and binary code for each level by building your own quantization table. ii) Calculate the minimum sampling rate and sampling time. ii) Identify the corresponding sampled voltage, the quantized voltage and binary code if the input signal is sampled at time t1 = 2us, t2 = 4us, t3 = 6us, t4 = 8µs. iv) Sketch the output in (iii) if it is fed to Manchester coding line encoder with bit rate of 20000 bit/sec and amplitude of +4 V. 5 4 3 2 10 Timel(usec) Figure 3 Amplitude (mV)
D. Modi 39 In linear madulation. the intelligent signal in conveyed in A. The amplitude of the transmitled signal BA The sideband compenents 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 a an added advantage? A. Asynchnous shift key modulation B Vestigial sidehand modulation C Spread spectrum DA Widehand Frequency modulation Narowbund FM and AM share a lot ef similarities encept that AThe lower side frequencies ae 80 out of phase B. The upper side frequencies are 180 out of phase C. The sidehand fequencies are IH0 out of phase. D None of the sbove 41
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