CD player

A CD player is an electronic device that reads digital audio from a compact disc and converts it into sound for speakers or headphones.

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Compact disc: An optical disc format that stores digital data as a spiral track read by a laser. Its spiral track carries the audio data the player retrieves.
Pulse-code modulation: A method of representing an analog signal as regularly sampled, quantized digital values. Compact-disc audio stores sound as pulse-code-modulated samples.
Sony: A Japanese electronics and entertainment company founded in 1946. Sony co-developed the compact disc format and commercial players.
Portable CD player: A battery-powered CD player designed for personal listening away from a fixed audio system. It adapts the same disc-reading system for mobile use.
Vinyl record player: A device that reads the grooves of a vinyl record and converts their motion into an audio signal. It plays analog records rather than digitally encoded optical discs.
Optical disc drive: A device that reads or writes data on optical discs using laser light. A CD player is a playback-focused kind of optical disc drive.
Sampling (signal processing): The process of measuring a continuous signal at discrete time intervals. A CD’s audio samples represent sound at a fixed rate.
Philips: A Dutch technology company founded in 1891, known for electronics and healthcare products. Philips co-developed the compact disc and introduced early CD players.
Discman: Sony’s brand name for its portable compact disc players. The Discman popularized portable CD listening.
Cassette player: A device that retrieves recorded sound from magnetic tape in a cassette. It uses magnetic tape instead of laser-read digital data.