Zmarł "ojciec płyt kompaktowych"

[Imacman]

W Japonii w wieku 81 lat zmarł Norio Ohga - jeden z najważniejszych ludzi w historii firmy Sony, twórca płyty CD oraz popularnej konsoli do gier komputerowych PlayStation.

 

Norio Ohga był szefem Sony w latach 1982-1995. Stał się "ojcem płyt kompaktowych", zasłynął z walki o porzucenie kaset magnetofonowych i dyskietek na rzecz płyt CD.

 

Dzięki niemu pod koniec lat 80. na świecie pojawiła się muzyka nowej jakości, zarejestrowana na błyszczących krążkach.

 

Info za Onet.pl

[tadeo]

No to mamy już pozamiatane ,zostaliśmy sierotami ,płyta CD odchodzi do lamusa ...

[cir]

twórca silnika diesla tez chyba zmarł

[Imacman]

twórca silnika diesla tez chyba zmarł

 

Cir chyba bliżej płycie kompaktowej do Forum audiostereo niż silnikowi diesla?

[Gość]

Onet troszkę "niedouczony" jest... ;)

Oficjalnie pierwsza płyta CD ukazała się 17 sierpnia (w tym dniu mam urodziny, hehe) 1982 roku - ABBA "Visitors" ; w Polsce 1989 KULT "Spokojnie".

[tadeo]

I diesel teraz kosztuje tyle,że nie opłaca się jeżdzić

[Imacman]

Przytoczyłem informację w celach edukacyjnym, aby co niektórzy nie twierdzili, że CD wymyślił radziecki uczony Kompaktov :)

[freedi]

Ludzie odchodzą...

A z tego co mi wiadomo to twórcą PSX-a jest raczej Ken Kutaragi i dziadzio ma się dobrze.

[tadeo]

A Firma Philips nie "maczała" w tym przypadkiem palców ?

[Wojtek76]

Szkoda wybitnych ludzi. Natomiast ojciec playstation to Ken Kutaragi.

[spitfire28]

Czy oby na pewno wynalazcą cd był ten pan ?

 

Nie przypadkiem niejaki James Russell ?

[stary audiofil]

A kto jest ojcem przełącznika do testow ABX?

[spitfire28]

XBA.

 

Starczy ?

[tadeo]

Nie ma co robić sobie jaj ,tylko oddać każdemu co mu się należy.

Wyrażamy tu swoje wątpliwości bo żródła podają różnie ,jak nam nie daj boże Jarek K. zejdzie to napiszą,że

zmarł wynalazca grilla.

[xniwax]

Dobrze jest, CD jest zasługą Norio Ohga,a pierwszy publiczny pokaz ODAD (ówczesna nazwa) Sony odbył się w 1976 roku.

[spitfire28]

James Russell

From Wikipedia, the free encyclopedia

For other uses, see: James Russell (disambiguation).

James T. Russell (born 1931 in Bremerton, Washington) is an American inventor. He earned a BA in physics from Reed College in Portland in 1953. He joined General Electric's nearby labs in Richland, Washington, where he initiated many types of experimental instrumentation. He designed and built the first electron beam welder.[1]

In 1965, Russell joined the Pacific Northwest National Laboratory of Battelle Memorial Institute in Richland. There, in 1965, Russell invented the overall concept of optical digital recording and playback.[1] The earliest patents by Russell, US 3,501,586, and 3,795,902 were filed in 1966, and 1969. respectively.[2][3] He built prototypes, and the first was operating in 1973. In 1973, 1974, 1975 his prototype was viewed by about 100 companies, including Philips and Sony engineers, and more than 1500 descriptive brochures were sent out to various interested parties[citation needed]. The concept was picked up by many technical and media magazines beginning in 1972[citation needed].

Russell's optical digital inventions were available publicly from 1970. Early optical recording technology, which forms the physical basis of videodisc, CD and DVD technology, was first published/filed by Gregg in 1958 and Philips researchers, Kramer and Compaan, in 1969. It is debatable to say whether Russell's concepts, patents, prototypes, and literature[citation needed] instigated and in some measure guided the optical digital revolution.[4]

Russell also invented an optical, massively parallel, memory system that uses no moving parts. This concept is taught in 6 patents[citation needed].

He has developed concepts for a novel transportation system and urban structure[citation needed].

Russell currently (July 2007) holds 54 US patents.

[edit]Physical details of the early Russell patents

 

Major features of the early Russell patents:

The preferred embodiment of the scanning mechanism is awkward since the disc is not rotating but fixed. A scanning mirror with which the light is deflected is attached to a rotating shaft.

The entire disc or oblong sheet to be read is illuminated by a large playback light source at the back of the transparent plate instead by focused laser light in reflective mode. There is no objective lens for reading the data.

Dynamic track or focus servos are absent.

The patent specification mentions the use of a protective layer(s) or coating to prevent scratching during handling, but the layer does not offer significant benefits, as its task is merely to protect. Fingerprints and scratches will obscure the data read. In a CD, on the other hand, where a focused laser beam is used in conjunction with a protective layer at the reading side of the disc, scratches and fingerprints are out of focus, and thus not detected by the reading spot. As a result, the CD/DVD method offers a great resilience against disc anomalies, offering great playability.

Low information density. According to the patent specifications the spot diameter is around 10 micrometres. Thus, the areal information density is, according to the patent specifications, around a factor hundred less than that of a regular CD. This amounts to a capacity of 5 Mbytes for a disc of 12 cm diameter. The inevitable downside to this is that Russell’s disc offers playing time less than one minute of digital CD sound. In case we have digital video at 30 Mbit/s, as claimed above, Russell’s disc would be read in less than two seconds. How such extremely fast scanning could be implemented was not disclosed.

Photographically copying of data.

The patents do not address any details of the digital coding techniques used and/or details of methods how to solve the problems associated with extremely high bit rates of digital video signals. Due to limitations of electronics circuitry, there was no (MPEG) source coding at the time to lower the overall bit rates. The uncompressed bit rate of a color video signal is around 200 Mbit/s, and it is far from clear how the mechanical (scanning speed) and electronic challenges imposed by these enormous bit rates were solved. The patents do not mention error correction or other digital coding technology.

[edit]

 

Wszystko jasne.

[xniwax]

Zapomniałeś dodać, że to jeden w dwóch osobach ;)a to jest najpilniej strzeżona tajemnica świata audio i video.

Od tego zaczęło się robienie melomanów w ciula.

[spitfire28]

Dokładnie.

 

Znajomy dłubacz udowodnił mi że nawet 14 bit player TDA1540 gra doskonale.

Bo nie o sam DAC dokładnie chodzi.