Recorded Compact Discs

Recorded Compact Discs

Recorded compact discs, commonly known as CDs, are a type of optical disc used for storing digital audio data. They were first introduced in the early 1980s as a replacement for vinyl records and audio cassettes. CDs quickly gained popularity due to their superior sound quality, durability, and ease of use. A CD is made up of a polycarbonate plastic substrate, which is coated with a thin layer of aluminum or gold. The digital audio data is encoded onto the disc using a process called pit and land modulation. This involves using a laser to burn microscopic pits onto the disc's surface, which represent the 1s and 0s of the digital audio data. The spaces between the pits are called lands. CDs have a storage capacity of up to 700 megabytes, which is enough to store up to 80 minutes of uncompressed audio. The audio data on a CD is read by a laser beam, which is reflected off the disc's surface and detected by a photodetector. The data is then converted back into an analog audio signal, which can be played back through speakers or headphones. Recorded compact discs have revolutionized the music industry, allowing for high-quality audio recordings to be produced and distributed on a large scale. They have also been used for other applications, such as storing software, video games, and other types of digital data. Despite the rise of digital music streaming services, CDs remain a popular format for music enthusiasts and collectors.

optical disc, digital audio, laser, storage capacity, music industry

— James Parker

CITATION : "James Parker. 'Recorded Compact Discs.' Design+Encyclopedia. https://design-encyclopedia.com/define/recorded-compact-discs?E=392628 (Accessed on October 13, 2026)"