CD Players
1982 onwardsEvery earlier format worked by contact — a needle in a groove, a head against tape — and every play took a little of the recording away. The CD read the disc with light, and the hundredth play was identical to the first.
Origin
Philips demonstrated optical digital audio playback to the international press in March 1979, showing that a disc read by laser could reproduce stereo audio.
Rather than fight a format war, Philips and Sony formed an alliance in 1979 and agreed a single standard — a decision that spared the CD the fate of competing formats that split the market and died.
The Compact Disc launched in Japan in November 1982 and reached Europe in March 1983.
How it worked
Sound is measured many thousands of times a second and each measurement stored as a number. Play it back in order at the same rate and the waveform is reconstructed.
Those numbers live on the disc as microscopic pits pressed into a reflective layer. A laser shines on the track; light reflects differently from a pit than from the flat land beside it, and the player reads that difference as ones and zeros.
Because it is reading numbers rather than tracing a shape, small imperfections can be corrected mathematically. That is why a lightly scratched CD often plays perfectly while an equivalently damaged record does not.
Discs are read from the centre outwards — the opposite of a record — and the disc slows as the laser moves out, so the track passes the laser at a constant speed.
Why it took over so fast
No surface noise, no hiss, no wear. Instant track access instead of lifting an arm or winding tape. Small enough for the car and eventually for a pocket.
It also gave the industry something no new format had offered before: a reason for people to buy music they already owned, again. Back catalogue reissues were a large part of the economics of the era.
Then and now
The MP3 and then streaming took the convenience argument further than a disc could follow, and CD sales fell sharply through the 2000s.
What remains is a format that is genuinely good and now inexpensive. A CD is a perfect copy of a master that does not degrade, does not depend on a subscription, and cannot be removed from your shelf by a licensing dispute.
Names that mattered
Listed because of what they did, not as recommendations. Velorex Music did not make any of these.
Did you know?
- Philips and Sony agreed a common standard rather than competing — unusual, and the main reason the CD had no format war.
- The disc spins more slowly as the laser tracks outward, keeping the data passing at a constant rate.
- Error correction is built into the format itself, which is why a scratch that would ruin a record is often inaudible.
- The CD reads from the inside out; a record plays from the outside in.
Remember this?
The CD had its own set of small rituals: the hinge of the jewel case, the tiny booklet with lyrics printed too small, the drawer sliding shut on its own, and the pause while the player read the disc and told you how many tracks were coming.
Sources & further reading
- Philips — Compact Disc, 1982–1983
- Philips Research — The history of the CD: the beginning
- IEEE ETHW — Compact Discs (CDs)
- Smithsonian Music — Laser for Sony Discman
Written from these sources, not copied from them. External links open in a new tab.