{"id":240,"date":"2023-06-21T11:54:27","date_gmt":"2023-06-21T11:54:27","guid":{"rendered":"https:\/\/concordant-thought.com\/?p=240"},"modified":"2023-06-21T11:54:27","modified_gmt":"2023-06-21T11:54:27","slug":"when-did-the-first-compact-disc-come-out","status":"publish","type":"post","link":"https:\/\/concordant-thought.com\/when-did-the-first-compact-disc-come-out\/","title":{"rendered":"When Did The First Compact Disc Come Out?"},"content":{"rendered":"
When Did The First Compact Disc Come Out<\/strong>\u00a0\u2013\u00a0\u00a0Origin of the Compact Disc!\u00a0<\/strong>The compact disc is popularly known as CD ( Compact Disc ). It is a revolutionary invention that allows you to store data digitally (photos, music, videos or documents). Its reproduction fidelity spelled the end of the analog age. At concordant-thought.com, we explain the origin and history of the Compact Disc and also who invented it.<\/span><\/p>\n In March 1979 , the presentation to the press of the first compact disc by the Philips company represents the result of almost twenty years of research in the field of electronic optics .<\/span><\/p>\n The CD is the result of the work of many years of a large group of engineers. They got this digital recording and playback system based on the early studies of American scientist James Russel.<\/span><\/p>\n The compact disc is a direct evolution of the LaserDisc. However, studies on the laser-readable disc are not the property of the Dutch firm Philips. Starting in the late 1970s, the Japanese companies Sony and JVC developed models of audiumeric discs derived from videodisc systems perfected in 1972.<\/span><\/p>\n This is how, in August 1980, Philips and Sony signed an agreement on the common standards that they will adopt for the development of the compact disc and its reader. A group of engineers is created led by Toshinada Doi (Sony) and Kees Schouhamer Immik (Phillips).<\/span><\/p>\n One year later, Philips \/ Sony audio-numeric disc and player licenses are purchased by some 40 companies, demonstrating the success of the new process.<\/span><\/p>\n The revolution brought by the compact disc in the field of sound recording, storage and reproduction obviously causes a massive turn of manufacturers towards this new technology.<\/span><\/p>\n Indeed, since Edison\u2019s invention of the phonograph in 1376, audio equipment has evolved very little. It remains of the analog type, that is, a physical quantity is made to correspond to a similar one (in this case the sound wave) by means of transducer devices. Like the microphone, the reading diamond, and the speaker.<\/span><\/p>\n The circle is closed but, of course, for the analogy to be perfect, the equipment must not have any distortion to restore the purest sound wave, which never happens.<\/span><\/p>\n In compact disc technology, everything changes. The analog treatment of the signal is put aside in favor of a numerical treatment. For this, the sequence of pulses caused by the sound signal is used and it is divided into \u201csamples\u201d, that is, instants separated by equal time periods.<\/span><\/p>\n Each sample is compared with reference pulses and numerically coded by computer (at a rate of 44,100 operations per second) according to the value of the closest reference pulse.<\/span><\/p>\n The microcavities are arranged in a spiral with a very narrow pitch (1.6 thousandths of a millimeter), embedded in the disk, its width is 0.5 thousandths of a millimeter, its depth 0.1 thousandths of a millimeter, and its length varies according to the amount of information that contains, the same as for the intermediate spaces.<\/span><\/p>\n The information is read by a laser that travels the surface of the disk from the inside out, the reverse of the microgroove. With a speed that progressively goes from 200 to 500 revolutions per minute to ensure a constant parade speed.<\/span><\/p>\n The laser is the only light source with a fairly cohesive and steerable light beam. In order to be able to accurately explore the microscopic surface of the cavity (the diameter of the light point is, after refraction, 1.7 thousandth of a millimeter).<\/span><\/p>\n The laser beam is reflected more or less brightly as it passes over a microcavity or a smooth space. Thus signaling the presence of one or a series of \u201c0\u201d or \u201c1\u201d. This differential reflection of the beam is then reflected onto a photoelectric cell that transforms it into a series of electrical pulses.<\/span><\/p>\n These are decoded by microelectronic circuits and sent to the amplifier, which then follows the same classic analog scheme.<\/span><\/p>\n More Readings:<\/strong><\/span><\/p>\n\n
Who Invented the Compact Disc<\/strong><\/span><\/h2>\n
when was the compact disc invented?<\/strong><\/span><\/h3>\n
Origin of the compact disc<\/strong><\/span><\/h3>\n
what is the origin of the compact disc?<\/strong><\/span><\/h3>\n
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End of the analog age<\/strong><\/span><\/h3>\n
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Start of the digital age<\/strong><\/span><\/h3>\n
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\nThe numerical information obtained is laser engraved on a matrix, from which the disk itself is engraved.<\/span><\/li>\nHow to read a compact disc<\/strong><\/span><\/h3>\n