Comparison of spectrograms of audio in an uncompressed format and several lossy formats. The lossy spectrograms show bandlimiting of higher frequencies, a common technique associated with lossy audio compression.
Some of the different types of data.
Solidyne 922: The world's first commercial audio bit compression sound card for PC, 1990
Processing stages of a typical video encoder

In the context of data transmission, it is called source coding; encoding done at the source of the data before it is stored or transmitted.

- Data compression

It may also be an analog signal such as a phone call or a video signal, digitized into a bit-stream, for example, using pulse-code modulation or more advanced source coding schemes.

- Data communication
Comparison of spectrograms of audio in an uncompressed format and several lossy formats. The lossy spectrograms show bandlimiting of higher frequencies, a common technique associated with lossy audio compression.

2 related topics

Alpha

A two-dimensional visualisation of the Hamming distance, a critical measure in coding theory.

Coding theory

Study of the properties of codes and their respective fitness for specific applications.

Study of the properties of codes and their respective fitness for specific applications.

A two-dimensional visualisation of the Hamming distance, a critical measure in coding theory.

Codes are used for data compression, cryptography, error detection and correction, data transmission and data storage.

Partial map of the Internet, with nodes representing IP addresses

Information

Processed, organized and structured data.

Processed, organized and structured data.

Partial map of the Internet, with nodes representing IP addresses
Galactic (including dark) matter distribution in a cubic section of the Universe
Information embedded in an abstract mathematical object with symmetry breaking nucleus
Visual representation of a strange attractor, with converted data of its fractal structure

Data can represent redundant symbols, but approaches information through optimal data compression.

These fields deal with those processes and techniques pertaining to information capture (through sensors) and generation (through computation, formulation or composition), processing (including encoding, encryption, compression, packaging), transmission (including all telecommunication methods), presentation (including visualization / display methods), storage (such as magnetic or optical, including holographic methods), etc.