The Creation Of The Compact Disc

Creation of compact discs well-known as CD dates back to the late 1960's. A Dutch scientist, Philips Research Company 's Klass Compaan, came up with the idea of ​​a CD. He collaborated with Piet Kramer, another scientist who jointly developed the first color video prototype in 1972. Sony and Philips collaborated on this disc and they jointly developed a standard universal disc for storing audio information.

After recording the disc, it can be played by a conventional disc player. The CD player reads the disc, converts the digital information into sound waves, and listens through the player's stereo system. The intensity of the audible sound depends on the quality of the laser reading area. Flat dot or binary 0 on the disc is muted or not recorded. Disk pits (binary 1) are read as sounds. The bigger the binary 1 in a particular place, the stronger the sound.

In 1982, consumers introduced digital audio for the first time in the form of optical discs. The disc uses a laser beam inside the player to read the pits on the silver disc surface. This means that the analog track is not divided into records, but a binary signal (a series of 1's and 0's behave in the same way as arithmetic techniques). Therefore, the analog music captured by the microphone is converted to a digital signal using an analog-to-digital (A to D) converter before being stored in the CD or audio player. When playing a track, the digital signal is converted to an analog signal by the D / A converter (D to A) and then played through the speaker.

The laser of the disc player reads the digital code of the disc. The optical disc player includes semiconductor laser layers having different conductivities. They are limited by two mirrors to a specific area of ​​the CD player. The current pumps the laser to the junction. These lasers can read the digital information on the optical disc with an efficiency level higher than 50%. This efficiency level increases as the number of lasers in the region increases. The most efficient disc player contains over one million lasers per square centimeter