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Communications Lab 5: Sampling and Reconstruction

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Questions and Answers

What is the process of converting analog signals to digital signals called?

Pulse Amplitude Modulation
Low Pass Filtering
Analog to Digital Conversion (correct)
Digital to Analog Conversion

What is the purpose of the low pass filter in the receiver?

To amplify the signal
To decode and reconstruct the signal (correct)
To sample the signal
To encode the signal

What is the duration of the sample pulse dependent on?

The frequency of the switch control signal
The duration of the switch being closed (correct)
The amplitude of the message signal
The resistance of the switch

What is the name of the modulation technique used in this process?

Pulse Amplitude Modulation (D) Signup and view all the answers

What is the switch control signal shown as in the figure?

A pulse train (B) Signup and view all the answers

What is the output of the switch when it is open?

Zero volts (A) Signup and view all the answers

What is the primary reason digital transmission has replaced analog in commercial communications applications?

Resistance to interference caused by electrical noise (A) Signup and view all the answers

What is the process of converting an analog signal to digital signal?

Sampling (B) Signup and view all the answers

What is the purpose of the digital sampling signal in the figure?

To tell the sampling circuit when to measure the message (B) Signup and view all the answers

What is the purpose of the micro-switch under the EX-OR GATE module?

To switch between the message signal and the sampled signal (B) Signup and view all the answers

What is the result of 'naturally' sampling the message at the rate set by the sampling signal?

A changed sample (A) Signup and view all the answers

What is the frequency of the DIGITAL output from the Master Signals module?

8.33kHz (C) Signup and view all the answers

What is the characteristic of digital signals that makes them suitable for transmission in commercial communications applications?

Resistance to interference caused by electrical noise (A) Signup and view all the answers

What is the purpose of the electronically controlled switch in the block diagram?

To connect the message signal to the output (A) Signup and view all the answers

What is the significance of the 2.08kHz SINE output from the Master Signals module?

It is the message signal being sampled (D) Signup and view all the answers

Why is sampling required in digital transmission systems?

To convert analog signals to digital (A) Signup and view all the answers

What is the purpose of the oscilloscope in the experiment?

To observe the message and sampled signals (A) Signup and view all the answers

What is the role of the MUX module in the experiment?

To sample the message signal (B) Signup and view all the answers

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