4.1.5

Representing Sound

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Representing Sound

Sound travels as analogue waves, but computers need to convert this to a digital format.

Sampling

Sampling

When sound is recorded by a computer its amplitude is recorded at regular intervals.
The value of the amplitude at each sample is stored as a binary value.
The number of bits used to store each sample is known as the sample size.
The number of samples taken per second is known as the sampling rate.

Quality of audio

Quality of audio

Increasing the sampling rate will increase the quality of the audio.
Increasing the sample size will also increase the quality of the audio.
Unfortunately, increasing these make the file size larger.

Bit rate and file size

Bit rate and file size

The bit rate is the amount of data stored per second of audio.
The bit rate is calculated as bitrate = sample rate $\times$ sample size.

1

Computational Thinking & Algorithms

1.1

Computational Thinking

1.1.1Abstraction Thinking 1.1.2Decomposition Thinking 1.1.3Algorithmic Thinking

1.2

Algorithms

1.2.1Algorithms 1.2.2Pseudocode 1.2.3Flow Diagrams 1.2.4Logical Reasoning & Debugging 1.2.5Reading Algorithms 1.2.6Correcting Algorithms 1.2.7Complete the Algorithm 1.2.8Search Algorithms 1.2.9Linear Search 1.2.10Binary Search 1.2.11Sort Algorithms 1.2.12Bubble Sort 1.2.13Insertion Sort 1.2.14End of Topic Test - Algorithms

2

Programming

3

Hardware & Software

3.1

Hardware

3.1.1Elements of Computer Systems 3.1.2Central Processing Unit (CPU)3.1.3Registers of the Central Processing Unit (CPU)3.1.4Factors Affecting CPU Performance 3.1.5Fetch-Decode-Execute Cycle 3.1.6Binary Systems 3.1.7Logic Circuits 3.1.8Boolean Logic 3.1.9End of Topic Test - Logic

3.2

Software

3.2.1System Software

4

Data

4.1

Representing Data

4.1.1Binary 4.1.2Converting Binary & Hexadecimal 4.1.3Converting Denary & Hexadecimal 4.1.4Binary Arithmetic 4.1.5Representing Sound 4.1.6Representing Images 4.1.7Character Sets 4.1.8American Standard Code for Information Interchange 4.1.9Unicode 4.1.10End of Topic Test - Representation

5

The Internet

5.1

Networks

5.1.1Networks 5.1.2Geographical Classification of Networks 5.1.3What is the Internet?5.1.4The World Wide Web 5.1.5Uniform Resource Locators (URLs)5.1.6Web Hosting 5.1.7HTML 5.1.8Searching the World Wide Web 5.1.9Good Searching Tips 5.1.10Are You Looking at Reliable Information?

6

Online Safety & Security

6.1

Protecting Yourself Online

6.1.1Digital Footprints 6.1.2Leaving a Safe Online Footprint 6.1.3Online Safety 6.1.4Malware - Viruses 6.1.5Malware 6.1.6People Online 6.1.7Your Feelings 6.1.8Getting Help

6.2

Computing and the Law

6.2.1Data Protection Act (1998)6.2.2Computer Misuse Act (1990)6.2.3Freedom of Information Act (2000)6.2.4Plagiarism 6.2.5Copyright 6.2.6Copyright Designs and Patents Act (1988)6.2.7Creative Commons Licensing

Jump to other topics

1

Computational Thinking & Algorithms

1.1

Computational Thinking

1.1.1Abstraction Thinking 1.1.2Decomposition Thinking 1.1.3Algorithmic Thinking

1.2

Algorithms

1.2.1Algorithms 1.2.2Pseudocode 1.2.3Flow Diagrams 1.2.4Logical Reasoning & Debugging 1.2.5Reading Algorithms 1.2.6Correcting Algorithms 1.2.7Complete the Algorithm 1.2.8Search Algorithms 1.2.9Linear Search 1.2.10Binary Search 1.2.11Sort Algorithms 1.2.12Bubble Sort 1.2.13Insertion Sort 1.2.14End of Topic Test - Algorithms

2

Programming

3

Hardware & Software

3.1

Hardware

3.1.1Elements of Computer Systems 3.1.2Central Processing Unit (CPU)3.1.3Registers of the Central Processing Unit (CPU)3.1.4Factors Affecting CPU Performance 3.1.5Fetch-Decode-Execute Cycle 3.1.6Binary Systems 3.1.7Logic Circuits 3.1.8Boolean Logic 3.1.9End of Topic Test - Logic

3.2

Software

3.2.1System Software

4

Data

4.1

Representing Data

4.1.1Binary 4.1.2Converting Binary & Hexadecimal 4.1.3Converting Denary & Hexadecimal 4.1.4Binary Arithmetic 4.1.5Representing Sound 4.1.6Representing Images 4.1.7Character Sets 4.1.8American Standard Code for Information Interchange 4.1.9Unicode 4.1.10End of Topic Test - Representation

5

The Internet

5.1

Networks

5.1.1Networks 5.1.2Geographical Classification of Networks 5.1.3What is the Internet?5.1.4The World Wide Web 5.1.5Uniform Resource Locators (URLs)5.1.6Web Hosting 5.1.7HTML 5.1.8Searching the World Wide Web 5.1.9Good Searching Tips 5.1.10Are You Looking at Reliable Information?

6

Online Safety & Security

6.1

Protecting Yourself Online

6.1.1Digital Footprints 6.1.2Leaving a Safe Online Footprint 6.1.3Online Safety 6.1.4Malware - Viruses 6.1.5Malware 6.1.6People Online 6.1.7Your Feelings 6.1.8Getting Help

6.2

Computing and the Law

6.2.1Data Protection Act (1998)6.2.2Computer Misuse Act (1990)6.2.3Freedom of Information Act (2000)6.2.4Plagiarism 6.2.5Copyright 6.2.6Copyright Designs and Patents Act (1988)6.2.7Creative Commons Licensing

Practice questions on Representing Sound

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1
How is audio stored digitally?Multiple choice
2
Which factors will increase the quality of audio?Fill in the list
3
What is the drawback of increasing sample rate and sample size?Multiple choice

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Binary Arithmetic

Representing Images