4.1.5
Representing Sound
Representing Sound
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 sample size.
1Computational Thinking & Algorithms
1.1Computational Thinking
1.2Algorithms
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
2Programming
2.1Programming Fundamentals
2.1.1Variables & Constants
2.1.2Comments
2.1.3Input & Output
2.1.4Arithmetic Operators
2.1.5Relational Operators
2.1.6Boolean Operators
2.1.7Sequence
2.1.8Selection
2.1.9Iteration
2.1.10Subroutines
2.1.11Scope
2.1.12Data Types
2.1.13Casting
2.1.14Arrays
2.1.152D Arrays
2.1.16Lists
2.1.172D Lists
2.1.18Strings
2.1.19Syntax Errors
2.1.20Logic Errors
2.1.21Runtime Errors
2.1.22End of Topic Test - Programming
2.2Designing Code
3Hardware & Software
3.1Hardware
3.2Software
4Data
5The Internet
6Online Safety & Security
6.1Protecting Yourself Online
Jump to other topics
1Computational Thinking & Algorithms
1.1Computational Thinking
1.2Algorithms
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
2Programming
2.1Programming Fundamentals
2.1.1Variables & Constants
2.1.2Comments
2.1.3Input & Output
2.1.4Arithmetic Operators
2.1.5Relational Operators
2.1.6Boolean Operators
2.1.7Sequence
2.1.8Selection
2.1.9Iteration
2.1.10Subroutines
2.1.11Scope
2.1.12Data Types
2.1.13Casting
2.1.14Arrays
2.1.152D Arrays
2.1.16Lists
2.1.172D Lists
2.1.18Strings
2.1.19Syntax Errors
2.1.20Logic Errors
2.1.21Runtime Errors
2.1.22End of Topic Test - Programming
2.2Designing Code
3Hardware & Software
3.1Hardware
3.2Software
4Data
5The Internet
6Online Safety & Security
6.1Protecting Yourself Online
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