{"id":20625,"date":"2011-10-23T08:25:08","date_gmt":"2011-10-23T05:25:08","guid":{"rendered":"http:\/\/www.lovendal.net\/wp52\/?p=20625"},"modified":"2011-10-23T08:25:08","modified_gmt":"2011-10-23T05:25:08","slug":"cum-a-fost-inventata-televiziunea-una-dintre-cele-mai-mari-descoperiri-ale-omenirii","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/cum-a-fost-inventata-televiziunea-una-dintre-cele-mai-mari-descoperiri-ale-omenirii\/","title":{"rendered":"Cum a fost inventat\u0103 televiziunea, una dintre cele mai mari descoperiri ale omenirii"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/10\/TV-veche.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-20626\" title=\"TV veche\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/10\/TV-veche.jpg\" alt=\"\" width=\"300\" height=\"264\" \/><\/a>Televiziunea a fost o inven\u0163ie fezabil\u0103 cu aproape o jum\u0103tate de secol \u00eenainte de a deveni realitate, principiile sale fundamentale evolu\u00eend diferen\u0163iat \u00een Germania, Anglia, Sco\u0163ia, Fran\u0163a, Rusia \u015fi Statele Unite. Unul dintre motivele pentru care acest sistem revolu\u0163ionar de comunicare nu a fost creat mai devreme l-a constituit slaba comunicare dintre numero\u015fii s\u0103i pionieri; un alt motiv l-a reprezentat faptul c\u0103 ideile dep\u0103\u015feau stadiul tehnologic existent la acea dat\u0103.<\/p>\n<p>Principiul fundamental pe baza c\u0103ruia func\u0163ioneaz\u0103 toate formele modeme de televiziune &#8211; baleierea rapid\u0103 a ecranului, linie cu linie, pentru a se ob\u0163ine o imagine &#8211; a fost formulat \u00eenc\u0103 din anii 1880 de c\u0103tre W. E. Sawyer \u00een Statele Unite \u015fi de Maurice Leblanc \u00een Fran\u0163a. Dispozitivul care putea realiza acest aspect &#8211; o roat\u0103 mecanic\u0103 ce fragmenta \u015fi reconstituia o imagine &#8211; a fost construit \u00een anul 1884 \u00een Germania de un inventator \u00een v\u00e2rst\u0103 de 24 de ani, Paul Nipkow.<\/p>\n<p>\u00cens\u0103, probabil cea mai important\u0103 contribu\u0163ie adus\u0103 tehnicii televiziunii dateaz\u0103 din 1908 \u015fi-i apar\u0163ine inginerului electrician sco\u0163ian A. Campbell Swinton, a c\u0103rui metod\u0103 st\u0103, \u00een linii mari, la baza televiziunii moderne. El a propus folosirea a dou\u0103 tuburi catodice de baleiaj, deflectate \u00een c\u00e2mp magnetic at\u00e2t pentru camer\u0103, c\u00e2t \u015fi la ecranul receptor. Ideile geniale ale lui Swinton, precum \u015fi cele ale lui Sawyer, Leblanc \u015fi Nipkow au fost aplicate de c\u0103tre al\u0163ii aproape dou\u0103zeci de ani mai t\u00e2rziu.<\/p>\n<p>\u00centre timp, cercet\u0103torii din Anglia \u015fi din Statele Unite \u00ee\u015fi propuneau un obiectiv ceva mai pu\u0163in ambi\u0163ios. Lampa cu vapori de neon, creat\u0103 \u00een Statele Unite \u00een anul 1917, a f\u0103cut posibil\u0103 proiectarea unor tonuri diferite de gri pe un tub receptor prin simpla alternare a curentului de alimentare a tubului. Aceasta se numea lumin\u0103 modulat\u0103 \u015fi constituia exact descoperirea pe care o a\u015fteptau John Logie Baird din Anglia \u015fi Charles Francis Jenkins din Statele Unite. Ace\u015ftia, lucr\u00e2nd independent, au reu\u015fit fiecare \u00een anul 1923 s\u0103 combine lumina modulat\u0103 \u015fi roata de baleiere a lui Nipkow pentru reconstruirea unei imagini prin baleiaj orizontal.<\/p>\n<p>Britanicii i-au \u00eentrecut pe americani cu doi ani. Pe data de 2 octombrie 1925, \u00een mansarda casei sale, Baird a reu\u015fit s\u0103 transmit\u0103 o imagine identificabil\u0103 a capului unei p\u0103pu\u015fi uzate de ventriloc, pe nume Bill. El s-a precipitat afar\u0103 din cas\u0103 \u015fi a intrat \u00een biroul de la parter, conving\u00eendu-l pe un b\u0103iat ce lucra \u00een acel birou s\u0103-l \u00eenso\u0163easc\u0103 \u00een laboratorul de la mansard\u0103. B\u0103iatul speriat, a\u015fezat sub reflectoare puternice, avea s\u0103 fie prima imagine vie transmis\u0103 prin intermediul televiziunii. Baird a devenit faimos peste noapte. \u00cen anul 1927, a efectuat o transmisiune \u00eentre Londra \u015fi Glasgow, iar \u00een 1928 de la Londra la New York.<\/p>\n<p>\u00cen anul 1927, americanii au m\u0103rit claritatea imaginii de pe ecrane. \u00cen acel an, Jenkins a realizat prima transmisiune interurban\u0103 de televiziune din Statele Unite, nu prin intermediul undelor, ci prin cablu, conect\u00e2nd biroul secretarului comer\u0163ului Herbert Hoover din Baltimore cu biroul din New York al pre\u015fedintelui companiei AT&amp;T, Walter Gifford. Imaginea \u00eence\u0163o\u015fat\u0103 a ap\u0103rut pe un ecran de \u015fase centimetri din biroul lui Gifford \u015fi, \u00eentruc\u00e2t nu exista o transmisiune sonor\u0103, cei doi au comunicat prin intermediul telefonului.<\/p>\n<p>Primele transmisiuni experimentale de televiziune au fost efectuate \u00een Statele Unite \u00een anul 1928, iar \u00een Anglia, \u00een 1929. \u00cens\u0103 aceste transmisiuni nu fuseser\u0103 pe placul publicului. Chiar \u015fi cercet\u0103torii care erau nevoi\u0163i s\u0103 le urm\u0103reasc\u0103 \u00eencepeau s\u0103 se pl\u00e2ng\u0103, dup\u0103 un timp mai \u00eendelungat, de dureri oculare \u015fi de migrene. Aceste probleme erau inerente datorit\u0103 folosirii l\u0103mpii de neon \u015fi a ro\u0163ii lui Nipkow &#8211; ambele constituind \u00eenlocuiri de proast\u0103 calitate ale ideii geniale a lui Swinton, de utilizare a unui tub catodic cu baleiaj.<\/p>\n<p>Un astfel de tub a fost patentat \u00een anul 1930 de c\u0103tre Philo T. Farnsworth, un inventator \u00een v\u00eerst\u0103 de 21 de ani. \u00cen acela\u015fi an, Vladimir Zworykin de la Corpora\u0163ia American\u0103 de Radio a conceput o camer\u0103 de televiziune superioar\u0103. Aceste dou\u0103 inven\u0163ii au avut o importan\u0163\u0103 at\u00eet de mare pentru apari\u0163ia transmisiunilor modeme de televiziune, \u00eenc\u00e2t pentru prima dat\u0103 RCA s-a v\u0103zut nevoit\u0103 s\u0103 pl\u0103teasc\u0103 drepturi de autor unui inventator din afara corpora\u0163iei, t\u00e2n\u0103rului Farnsworth. RCA \u015fi-a inaugurat postul experimental, W2RBX, la New York pe data de 30 iulie 1930. Unul dintre primele spectacole programate, transmis mar\u0163i seara, pe 21 iulie 1931, o prezenta pe Kate Smith, \u00een piesa <em>\u201eWhen the Moon Comes Over the Mountain&#8221;.<\/em><\/p>\n<p>Pe la \u00eenceputul anilor 1940, \u00een Statele Unite func\u0163ionau 23 de posturi de televiziune. Cel de-al doilea r\u0103zboi mondial a stopat dezvoltarea acestei industrii, \u00eens\u0103 dup\u0103 ridicarea restric\u0163iilor impuse \u00een timpul r\u0103zboiului, \u00een anul 1946, televiziunea a evoluat cu o vitez\u0103 uluitoare.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Televiziunea a fost o inven\u0163ie fezabil\u0103 cu aproape o jum\u0103tate de secol \u00eenainte de a deveni realitate, principiile sale fundamentale evolu\u00eend diferen\u0163iat \u00een Germania, Anglia, Sco\u0163ia, Fran\u0163a, Rusia \u015fi Statele Unite. Unul dintre motivele pentru care acest sistem revolu\u0163ionar de &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Cum a fost inventat\u0103 televiziunea, una dintre cele mai mari descoperiri ale omenirii\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/cum-a-fost-inventata-televiziunea-una-dintre-cele-mai-mari-descoperiri-ale-omenirii\/#more-20625\" aria-label=\"Cite\u0219te mai multe despre Cum a fost inventat\u0103 televiziunea, una dintre cele mai mari descoperiri ale omenirii\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":20626,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[4640,203,2290,3518,392,9803,23,396],"class_list":["post-20625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-electronica","tag-germania","tag-inventator","tag-inventie","tag-marea-britanie","tag-stiinta","tag-sua","tag-televiziune","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cum a fost inventat\u0103 televiziunea, una dintre cele mai mari descoperiri ale omenirii - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/cum-a-fost-inventata-televiziunea-una-dintre-cele-mai-mari-descoperiri-ale-omenirii\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cum a fost inventat\u0103 televiziunea, una dintre cele mai mari descoperiri ale omenirii\" \/>\n<meta property=\"og:description\" content=\"Televiziunea a fost o inven\u0163ie fezabil\u0103 cu aproape o jum\u0103tate de secol \u00eenainte de a deveni realitate, principiile sale fundamentale evolu\u00eend diferen\u0163iat \u00een Germania, Anglia, Sco\u0163ia, Fran\u0163a, Rusia \u015fi Statele Unite. 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Unul dintre motivele pentru care acest sistem revolu\u0163ionar de ... 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