Assignment 4

(i)Electrical pulses can be varied to represent characteristics of an analog voice signal.Propose ONE (1) pulse modulation scheme to represent the voice digitalization signal.Defend why your proposal is the best and support your answer by illustrating theelectrical pulses waveform to represent an analog voice signal. (ii)Phase Shift Keying (PSK) demonstrates better performance than Frequency ShiftKeying (FSK). State your argument and draw a comparison waveform to illustrate theexamples of both shift keying method.

3. What role does the RC time constant play in a filter circuit ?. In designing of a filter following a rectifier the RC time constant is desired to be long. Why this is so ?

3. What is a Butterworth filter and where is this type of filter is used in an electronic circuit?

What is modulation? Why is it done? Describe one of the types of amplitude modulation

Frequency Response Discuss the importance of Nyquist plot technique in control systems.

For the signal flow graph of the given figure, consider the following statements 1. It has three forward paths 2. It has three individual loops 3. It * has two non touching loops Out of above the correct statements are Xg 1,3 O 1, 2, 3 O 1,2 O 2, 3 O

1) a) A 1V 5 kHz signal is put into a low pass filter with a cut-off frequency of 2 kHz. What will the  frequency of the output signal be?  b) A 1V 15 kHz sinewave signal is put into a low pass filter with a 2 kHz cut-off frequency. The output signal will have how much amplitude approximately?

Signals

A design objective in many control system applications is to achieve small time constants. An exception is the time constant requirements for a piezoelectric sensor. Explain why a large time constant, in the order of 1.0 s, is desirable for a piezoelectric sensor in combination with its signal conditioning system.