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The use of digital processing, such as by computers or more specialized digital signal processors, to perform a wide array of signal processing operations. Applications include audio and speech signal processing, radar and sonar, and image processing.

A type of digital transmission and a method of encoding digital data on multiple carrier frequencies. Applications include digital television broadcast, 4G mobile communications, and Wi-Fi.

The process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. Applications include radio broadcasting, television, and telecommunications.

A form of modulation where the amplitude of the carrier wave is varied in accordance with the data signal being transmitted. Applications include RFID tags, modem technology, and digital telephony systems.

A frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier wave. Applications include dial-up modems, amateur radio, and RFID.

A form of modulation which conveys data by changing the phase of the carrier wave. Applications include wireless LANs, RFID, and contactless smart cards.

Techniques used in digital systems to detect and correct errors which may occur in the transmitted data. Applications include computer memory (ECC memory), data communication, and file storage.

The process of converting information from one format into another. In communication, encoding can refer to analog-to-digital conversion, digital-to-analog conversion, and line coding. Applications include data storage, computer networks, and digital video.

A modulation scheme which conveys two analog message signals, or two digital bit streams, by changing the amplitudes of two carrier waves. Applications include cable television systems and broadband internet access.