{"id":2710,"date":"2017-06-09T20:13:13","date_gmt":"2017-06-09T20:13:13","guid":{"rendered":"http:\/\/revistahometheater.uol.com.br\/portal\/?p=2710"},"modified":"2018-07-31T17:45:33","modified_gmt":"2018-07-31T17:45:33","slug":"audio-de-alta-definicao","status":"publish","type":"post","link":"https:\/\/www.hometheater.com.br\/portal\/2017\/06\/09\/audio-de-alta-definicao\/","title":{"rendered":"\u00c1udio de Alta Resolu\u00e7\u00e3o"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2711\" src=\"http:\/\/revistahometheater.uol.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac.png\" alt=\"\" width=\"800\" height=\"434\" srcset=\"https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac.png 800w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac-400x217.png 400w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac-500x271.png 500w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac-300x163.png 300w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac-768x417.png 768w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/mp3xflac-50x27.png 50w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<a href=\"#\" target=\"_self\" class=\"buttons btn_blue left\"><span class=\"left\">Por Alexandre Algranti*<\/span><\/a>\n<p>Na d\u00e9cada de 1980, o \u00e1udio digital para consumo estava na sua inf\u00e2ncia e era nitidamente inferior aos sistemas anal\u00f3gicos ditos \u201chigh-end\u201d. Alguns CDs lan\u00e7ados na \u00e9poca eram simples transfer\u00eancias de LPs virgens, que reproduziam o rumble do toca-discos utilizado na transfer\u00eancia, al\u00e9m de eventuais estalos de est\u00e1tica e os pr\u00e9-ecos resultantes do armazenamento das fitas master anal\u00f3gicas nos est\u00fadios de grava\u00e7\u00e3o.<\/p>\n<p>J\u00e1 os DACs (\u201cdigital to analog converter\u201d \u2013 conversor digital para anal\u00f3gico) soavam muito industriais e pouco musicais, com um som extremamente limpo e livre de chiados, por\u00e9m carecendo dos micro detalhes necess\u00e1rios para uma reprodu\u00e7\u00e3o sonora plena.<\/p><div class=\"homet-conteudo\" style=\"text-align: center;\" id=\"homet-412911477\"><div data-cfpa=\"36066\" data-cfpw=\"36066\" id=\"homet-2312789559\"><a data-no-instant=\"1\" href=\"https:\/\/loja.sommaior.com.br\/\" rel=\"noopener\" class=\"a2t-link\" aria-label=\"ABBEY-ROAD_360x300px\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2025\/10\/ABBEY-ROAD_360x300px.jpg\" alt=\"\"  class=\"no-lazyload\" width=\"300\" height=\"250\"   \/><\/a><\/div><script type=\"text\/javascript\">;new advadsCfpAd( 36066 );<\/script><\/div>\n<p>Por \u00faltimo, a masteriza\u00e7\u00e3o para esta nova m\u00eddia dava os seus primeiros passos e muitos engenheiros, t\u00e9cnicas e tecnologias ainda estavam por vir.<\/p>\n<p>Os arquivos de \u00e1udio de alta resolu\u00e7\u00e3o j\u00e1 s\u00e3o uma realidade e se igualam ou mesmo superam a qualidade da reprodu\u00e7\u00e3o dos sistemas high-end em vinil. Repetindo. Se igualam ou mesmo superam a qualidade da reprodu\u00e7\u00e3o dos sistemas high-end em vinil.<\/p>\n<p>Se no CD convencional temos 44.100 amostras por segundo com 16 bits, atualmente os formatos \u201clossless\u201d de alta resolu\u00e7\u00e3o como o FLAC (\u201cFree Lossless Audio Codec\u201d) e o ALAC (\u201cApple Lossless Audio Codec) utilizam 88.200, 96.000, 176.400, 192.000 e at\u00e9 384.000 amostras por segundo, com 24 bits, e trazem a sala de masteriza\u00e7\u00e3o literalmente para a sala de estar.<\/p>\n<p>Outro formato denominado DSD (Direct Stream Digital) comporta entre 2,8 milh\u00f5es e 11,7 milh\u00f5es de amostras por segundo, com 1 bit para mais ou para menos!<\/p>\n<p>Tais formatos podem ser implementados em arquivos para download em computadores ou em m\u00eddias \u00f3pticas como o DVD-Audio, o Super Audio CD (SACD) e o Blu-Ray Audio, com cada faixa musical com centenas de Gigabytes de alt\u00edssima fidelidade.<\/p>\n<p><strong><u>DACs, pr\u00e9s e players<\/u><\/strong><u><\/u><u><\/u><\/p>\n<p><u><\/u>\u00a0<u><\/u>Um fone de ouvido pode ser melhor apreciado com o uso de um DAC ou pr\u00e9-amplificador, que entregam um sinal com a intensidade e a imped\u00e2ncia necess\u00e1rias para o funcionamento \u00f3timo do primeiro.<u><\/u><u><\/u><\/p>\n<p>Enquanto as placas de \u00e1udio dos desktops, notebooks e celulares podem reproduzir arquivos como o FLAC com at\u00e9 um certo n\u00famero de amostras por segundo, o fato de estarem integradas \u00e0s placas m\u00e3es e expostas \u00e0s verdadeiras tempestades eletromagn\u00e9ticas no interior dos dispositivos torna mandat\u00f3rio o uso de DACs externos, geralmente conectados \u00e0s portas USB ou Thunderbolt.<u><\/u><u><\/u><\/p>\n<p>Softwares \u00a0denominados \u201cplayers\u201d otimizam a reprodu\u00e7\u00e3o dos arquivos de alta resolu\u00e7\u00e3o no computador ao organizar o conte\u00fado e gerenciar quest\u00f5es cruciais como sincronismo, gerenciamento de mem\u00f3ria, convers\u00e3o de taxas de amostragem e formatos e demais tecnicalidades ligadas ao \u00e1udio digital. O meu favorito \u00e9 o JRiver Media Center\u00a0que se encontra na vers\u00e3o 22 e pode ser adquirido em:\u00a0<a id=\"m_4909698643524769411LPlnk123161\" class=\"m_4909698643524769411OWAAutoLink\" href=\"https:\/\/www.jriver.com\/download.html\" target=\"_blank\" rel=\"noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?hl=pt-BR&amp;q=https:\/\/www.jriver.com\/download.html&amp;source=gmail&amp;ust=1498075272628000&amp;usg=AFQjCNHTn48ZfA2zXYHLPkQYBTSWlAXtHQ\">https:\/\/www.jriver.com\/download.html<\/a><\/p>\n<p>J\u00e1 os pr\u00e9-amplificadores s\u00e3o geralmente utilizados com fones de imped\u00e2ncias superiores a 200 Ohms e sensibilidades da ordem de 95\u00a0dB e soam infinitamente superiores \u00e0s sa\u00eddas de fone encontradas em CD players,\u00a0receivers e dispositivos multim\u00eddia port\u00e1teis.<u><\/u><u><\/u><\/p>\n<p>Um pr\u00e9-amplificador pode ter m\u00faltiplas entradas, permitindo seu uso com dispositivos port\u00e1teis, e uma sa\u00edda tipo \u201cloop-through\u201d (cascata), que entrega o sinal proveniente de uma\u00a0entrada para outros dispositivos de amplifica\u00e7\u00e3o, como amplificadores integrados e receivers.<u><\/u><u><\/u><\/p>\n<p>Com diversos formatos f\u00edsicos, desde um pen-drive convencional at\u00e9 unidades monol\u00edticas de mesa, e configura\u00e7\u00f5es eletr\u00f4nicas que incluem o uso de transistores com especifica\u00e7\u00f5es militares e de v\u00e1lvulas termi\u00f4nicas, os DACs e pr\u00e9-amplificadores s\u00e3o indispens\u00e1veis e est\u00e3o cada vez mais em evid\u00eancia.<\/p>\n<p><strong><u>DIA ETERNO COM SOMBRAS FLUTUANTES<\/u><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-2713\" src=\"http:\/\/revistahometheater.uol.com.br\/portal\/wp-content\/uploads\/2017\/06\/violeta_de_outono.jpg\" alt=\"\" width=\"350\" height=\"350\" srcset=\"https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/violeta_de_outono.jpg 350w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/violeta_de_outono-100x100.jpg 100w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/violeta_de_outono-300x300.jpg 300w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/violeta_de_outono-150x150.jpg 150w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/violeta_de_outono-50x50.jpg 50w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/>O F\u00e1bio Golfetti \u00e9 uma cara genial. Guitarrista ex\u00edmio, fundou a banda Violeta de Outono e excursiona o mundo com o GONG, duas das minhas bandas progressivas psicod\u00e9licas favoritas. Produtor musical de n\u00edvel internacional, ele domina as tecnologias de cria\u00e7\u00e3o como poucos.<\/p>\n<p>Pedi a ele que gerasse um single \u00e0 moda antiga com duas m\u00fasicas do Violeta de Outono no formato FLAC, em 24 bits e 96 KHz, com \u201cDia Eterno\u201d no lado A e a instrumental \u201cSombras Flutuantes\u201d no lado B.<\/p>\n<p>\u201cDia Eterno\u201d foi um hit das FM\u00b4s no final dos anos 80 e tem uma pegada bem rock and roll, enquanto \u201cSombras Flutuantes\u201d \u00e9 mais \u201cviajandona\u201d com t\u00e9cnicas e efeitos de guitarra bem anos 60.<\/p>\n<p>Duas faixas muito bem gravadas e remasterizadas e que no formato FLAC podem ser utilizadas para avaliar fones de ouvido e demais transdutores. Muito provavelmente, \u00e9 o primeiro lan\u00e7amento do g\u00eanero no Brasil e pode ser saboreado ao clicar nos links abaixo:<\/p>\n<p><strong><a href=\"http:\/\/hometheater.com.br\/violetadeoutono\/diaeterno.flac\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2716 size-thumbnail\" src=\"http:\/\/revistahometheater.uol.com.br\/portal\/wp-content\/uploads\/2017\/06\/hi_res_audio-1-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/hi_res_audio-1-150x150.jpg 150w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/hi_res_audio-1-100x100.jpg 100w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><strong><a href=\"http:\/\/hometheater.com.br\/violetadeoutono\/diaeterno.flac\">Dia Eterno<\/a><\/strong><\/p>\n<p><strong><a href=\"http:\/\/hometheater.com.br\/violetadeoutono\/sombrasflutuantes.flac\">Sombras Flutuantes<\/a><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>[soundcloud url=&#8221;https:\/\/api.soundcloud.com\/tracks\/328887332&#8243; params=&#8221;color=ff5500&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&#8221; width=&#8221;100%&#8221; height=&#8221;166&#8243; iframe=&#8221;true&#8221; \/]<\/p>\n<p>[soundcloud url=&#8221;https:\/\/api.soundcloud.com\/tracks\/328887331&#8243; params=&#8221;color=ff5500&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&#8221; width=&#8221;100%&#8221; height=&#8221;166&#8243; iframe=&#8221;true&#8221; \/]<\/p>\n<p>Boa viagem!<\/p>\n<p><b>*Alexandre Algranti \u00e9 o Chief Headphone Officer do site\u00a0<a href=\"http:\/\/fonesdeouvido.com.br\/\" target=\"_blank\" rel=\"noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?hl=pt-BR&amp;q=http:\/\/fonesdeouvido.com.br&amp;source=gmail&amp;ust=1533144558243000&amp;usg=AFQjCNEV1IqeuGxS8PW1iRaaquRMKXW9YQ\">fonesdeouvido.com.br<\/a>. Leitores deste blog tem 10% de desconto em qualquer compra no site com o c\u00f3digo HT2018.<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na d\u00e9cada de 1980, o \u00e1udio digital para consumo estava na sua inf\u00e2ncia e era nitidamente inferior aos sistemas anal\u00f3gicos ditos \u201chigh-end\u201d. Alguns CDs lan\u00e7ados<\/p>\n","protected":false},"author":1,"featured_media":2711,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,3],"tags":[],"class_list":["post-2710","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fones-de-ouvido","category-artigos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00c1udio de Alta Resolu\u00e7\u00e3o - HT &amp; Casa Digital<\/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.hometheater.com.br\/portal\/2017\/06\/09\/audio-de-alta-definicao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c1udio de Alta Resolu\u00e7\u00e3o - HT &amp; Casa Digital\" \/>\n<meta property=\"og:description\" content=\"Na d\u00e9cada de 1980, o \u00e1udio digital para consumo estava na sua inf\u00e2ncia e era nitidamente inferior aos sistemas anal\u00f3gicos ditos \u201chigh-end\u201d. 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