06-30-2016, 03:34 PM
J'avais lu ça sur les sites de Sony et de Philips.
Citation :From the beginning, Philips argued for 14 bits, whereas Doi who represented Sony favored 16 bits. Achieving a higher number of quantization bits became more difficult and expensive. Doi believed that it was worth trying to produce a 16-bit system that would last well into the 21st century. When Philips researchers asked, "Will a 11.5 cm disc with sixty minutes of recording time be okay?" Sony researchers said, "No, we want a 12 cm disc with seventy-five minutes of recording time."( http://www.sony.net/SonyInfo/CorporateIn.../2-08.html )
Each argument was valid. Philips argued for a 11.5 cm disc because this was the same length as the diagonal length of an audiocassette. Also, this size satisfied the DIN standard and thus would be the right size for a car audio system in the European market. But it was Ohga, a trained musician, who decisively presented Sony's argument for a 12 cm, seventy-five minute disc. He argued that, "Just as a curtain is never lowered halfway through an opera, a disc should be large enough to hold all of Beethoven's Ninth Symphony." Ohga believed that the disc needed to be of a practical size for music aficionados and that 95% of all classical music pieces would fit onto a seventy-five minute disc. Therefore, a 12 cm disc was necessary to guarantee seventy-five minutes of playing time.
Citation :Sony first publicly demonstrated an optical digital audio disc at the 1977 Audio Fair. On 8 March 1979, Philips demonstrated for the international press a 11.5 cm Optical Disk and a Compact Disc Audio Player. The demonstration showed that it is possible by using digital optical recording and playback to reproduce audio signals with superb stereo quality. Through the co-operation with Sony the final diameter was 12 cm and the initially proposed resolution (accuracy) of 14 bits was increased to 16 bits. With this concept Philips and Sony took the first step in setting a worldwide standard.( http://www.philips.com/a-w/research/tech...nning.html )