Analog vs Digital: Understanding Continuous Quantities

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Questions and Answers

What happens to the reconstructed signal when the number of samples is reduced by half?

The reconstructed signal disappears completely.

The reconstructed signal remains unchanged.

The reconstructed signal becomes more accurate.

The reconstructed signal has missing peaks and dips. (correct)

What is a characteristic of most quantities in nature that can be measured?

They are always constant

They are discrete

They are continuous (correct)

They are always zero

What type of electronic systems accept and process continuous signals?

Mixed Electronic Systems

Hybrid Electronic Systems

Analogue Electronic Systems (correct)

Digital Electronic Systems

How does the intensity of light change throughout the day?

It gradually increases as the sun rises and decreases as the sun sets Signup and view all the answers

What happens when the sampling is increased to infinity?

The reconstructed signal becomes more accurate. Signup and view all the answers

What happens to the light intensity when the sun is obscured by a cloud?

It decreases gradually Signup and view all the answers

What is the result of under-sampling in signal reconstruction?

A less accurate representation of the continuous signal. Signup and view all the answers

What is the purpose of electronic processing of continuous and digital quantities?

To process continuous and digital quantities in terms of voltages. Signup and view all the answers

How does the temperature change during a 24-hour period?

It rises and falls gradually throughout the day and night Signup and view all the answers

How many samples are used to reconstruct the signal in Figure 1.3?

15 samples Signup and view all the answers

How does the velocity of a car travelling from one city to another vary?

It varies in a continuous manner Signup and view all the answers

What is the main difference between the original and reconstructed signals?

The original signal has smooth curves, while the reconstructed signal has sharp corners and edges. Signup and view all the answers

What is characteristic of digital quantities?

They are discrete and represent quantities measured at discrete intervals Signup and view all the answers

What is the purpose of sampling a continuous signal?

To reconstruct the original continuous signal. Signup and view all the answers

What happens to a continuous signal when it is represented digitally?

It becomes discrete and is sampled at fixed and equal intervals Signup and view all the answers

What is the set of values (1, 2, 4, 7, 18, 34, 25, 23, 35, 37, 29, 42, 41, 25 and 22) an example of?

A digital representation of a continuous signal Signup and view all the answers

Study Notes

Analogue vs Digital Quantities

Most natural quantities that can be measured are continuous, such as light intensity, temperature, and velocity.
Continuous quantities change gradually and smoothly over time, with no abrupt changes.

Characteristics of Analogue Quantities

Have a continuous range of values with a minimum and maximum value.
Examples: temperature values in a summer month (23°C to 45°C), car velocity (0 to 120 mph).

Digital Representation of Quantities

Digital quantities are not continuous, but represent quantities measured at discrete intervals.
A continuous signal is sampled at fixed and equal intervals to obtain digital values.
The number of samples collected determines the accuracy of the digital representation.

Limitations of Digital Representation

Fewer samples can lead to a reconstructed signal that is different from the original signal.
Under-sampling can result in missing peaks and dips in the reconstructed signal.
Increasing the number of samples and sampling intervals can improve the accuracy of the digital representation.

Electronic Processing of Quantities

Electronic processing of continuous quantities or their digital representation requires conversion to voltage representations.
There are two types of electronic processing systems: analogue and digital.
Analogue electronic systems accept and process continuous signals, while digital electronic systems process discrete digital values.

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Description

This quiz explores the concept of continuous quantities in nature, including examples of light intensity and how it changes throughout the day.