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.
A two-dimensional visualisation of the Hamming distance, a critical measure in coding theory.
Solidyne 922: The world's first commercial audio bit compression sound card for PC, 1990
Processing stages of a typical video encoder

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

- Coding theory

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

The theoretical aspects of data transmission are covered by information theory and coding theory.

- Data communication

Other topics associated with compression include coding theory and statistical inference.

- Data compression
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.

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