Audio Compact Disc -

The , officially known as Compact Disc Digital Audio (CD-DA) , is a digital optical disc data storage format. Co-developed by Sony and Philips and commercially introduced in 1982 , it revolutionized the music industry by offering superior sound quality, durability, and portability compared to analog formats like vinyl and cassettes. Technical Design & Functionality

: A film of acrylic lacquer seals the reflective layer to prevent corrosion and physical damage. How It Works audio compact disc

CD players use a to scan the disc from the center outward along a spiral track. When the laser hits a pit , it scatters the light; when it hits a land , the light is reflected back to a sensor. The sensor translates these light changes into electrical signals (zeros and ones), which are then converted back into high-fidelity audio. The Compact Disc: An Introduction The , officially known as Compact Disc Digital

A standard audio CD is a 120 mm (4.7 in) circular disc composed of several layers: How It Works CD players use a to

: A 1.2 mm thick layer of clear polycarbonate plastic .