Digital (information representation and systems)
Information and systems that use discrete digits—such as binary bits or decimal numerals—to encode, process, store and transmit data; contrasts with analogue representation.
Overview
The term "digital" describes methods and systems that represent information using discrete symbols or digits. Each digit is chosen from a limited set of values—for example, the ten decimal digits 0–9 or the two binary values 0 and 1. In everyday devices a decimal digit appears on a digital clock, while in most modern computing and communications infrastructure the basic unit is a binary digit, or bit. Digital representation reduces complex information to sequences of symbols that can be reliably stored, copied and manipulated.
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Key characteristics
Digital systems share several defining features:
- Discrete states: Information is encoded as distinct symbols or voltage levels rather than a continuous waveform.
- Quantization and sampling: Continuous phenomena (sound, light, motion) are converted into digitized samples and numeric values.
- Logic and processing: Operations on digits are carried out by digital logic, enabling arithmetic, control and decision-making. This underpins devices such as digital computers.
- Error detection and correction: Redundancy and coding techniques help detect or correct transmission and storage errors.
History and development
Digital ideas trace to positional number systems and mechanical calculating devices. The 20th century saw the rise of electronic binary logic, switching circuits and stored-program computers. The miniaturization of transistors and the emergence of integrated circuits made large-scale digital systems practical, accelerating development of consumer electronics, telecommunications and the global internet.
Uses and examples
Digital techniques appear across science, industry and everyday life. Typical uses include:
- Computation and software running on processors and computing platforms.
- Digital audio, images and video stored as files, streamed over networks, or manipulated in editing software.
- Telecommunications, where digital encoding and packetization carry voice and data across the internet and cellular networks.
- Embedded control systems in appliances, vehicles and industrial equipment implemented with digital electronics (electronics).
Distinctions and notable facts
Digital contrasts with analogue systems that represent information with continuous variables. Converting between the two requires sampling and digital-to-analogue or analogue-to-digital conversion; these steps introduce trade-offs such as quantization error and the need for sufficient sampling rate. Digital systems excel at reproducibility, programmability and integration with software, but analogue methods can still be advantageous for simplicity or when truly continuous precision matters.
Because of error-control methods, modular storage (bits, bytes, files) and scalable manufacturing, digital technology underlies most modern information systems, enabling everything from simple timers to global computing and communication networks.
Properties
- Production costs are usually high
- Reproduction costs are very low. Digital data can theoretically be made available as often as desired without additional costs.
- There is no loss of quality due to copying.
- Digital data can be provided centrally and are then immediately available everywhere at the same time.
- Digital data in electronic form is characterised by non-rivalry, i.e. a book in physical form, for example, can only ever be borrowed by one person in a library. If, on the other hand, the book is available electronically, it can be borrowed by any number of people at the same time.
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AlegsaOnline.com Digital (information representation and systems) Leandro Alegsa
URL: https://en.alegsaonline.com/art/27399