Digitization is the conversion of analogue data and information into a digital representation that computers can store, process and distribute. It changes a continuously varying signal or physical record into discrete numerical data, usually represented using binary digits.
Analogue information varies continuously. For example, the grooves on a vinyl record physically represent continuous changes in sound waves. To digitize that sound, a digital system performs three main steps:
- Sampling: The system measures the analogue signal at regular time intervals. A higher sampling rate records more measurements per second and can represent the original signal more accurately.
- Quantization: Each measurement is assigned to one of a fixed number of numerical levels. Because the original value may fall between two levels, some detail can be lost through quantization error.
- Encoding: The numerical measurements are represented as binary digits, using combinations of 0 and 1. The resulting digital data can be stored as a file, processed by software or transmitted through a network.
| Analogue information | Digitized information |
|---|---|
| Varies continuously | Uses discrete numerical values |
| Stored in a physical signal or medium | Encoded as binary data |
| Copies may lose quality | Copies can usually be reproduced without further degradation |
| Cannot be processed directly by a computer | Can be searched, edited, compressed and distributed by digital systems |
Digitization does not guarantee a perfect copy. Accuracy depends on factors such as sampling rate, bit depth and the condition of the original source. It also creates implications involving storage, access, ownership, preservation and privacy.
A common misconception is that digitization and digitalization mean the same thing. Digitization converts analogue material into digital form, while digitalization uses digital systems to change how an organization operates.
For SL and HL exams, connect this explanation to syllabus area 1.1F. An effective explain response should identify the conversion process, show how sampling, quantization and binary encoding work, and distinguish digitization from digitalization.
