{"id":2657,"date":"2017-06-07T12:52:49","date_gmt":"2017-06-07T12:52:49","guid":{"rendered":"http:\/\/revistahometheater.uol.com.br\/portal\/?p=2657"},"modified":"2018-07-31T20:34:27","modified_gmt":"2018-07-31T20:34:27","slug":"audio-no-computador-musica-com-e-sem-compressao","status":"publish","type":"post","link":"https:\/\/www.hometheater.com.br\/portal\/2017\/06\/07\/audio-no-computador-musica-com-e-sem-compressao\/","title":{"rendered":"\u00c1udio no computador: m\u00fasica com e sem compress\u00e3o"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2661 aligncenter\" src=\"http:\/\/revistahometheater.uol.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless.jpg\" alt=\"\" width=\"800\" height=\"450\" srcset=\"https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless.jpg 800w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless-400x225.jpg 400w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless-500x281.jpg 500w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless-300x169.jpg 300w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless-768x432.jpg 768w, https:\/\/www.hometheater.com.br\/portal\/wp-content\/uploads\/2017\/06\/lossless-50x28.jpg 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><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=1533149937818000&amp;usg=AFQjCNHopNVmYZpZ4AqVmsnNf6CPS0k-gA\">fonesdeouvido.com.br<\/a>. Leitores deste blog tem 10% de desconto em qualquer compra no site com o c\u00f3digo HT2018.<\/b><\/p>\n<p>Se Nicola Tesla (1856-1943) \u00e9 o Santo Padroeiro da Eletricidade, Claude Shannon (1916-2001) \u00e9 certamente o Santo Padroeiro do \u00e1udio digital. Seu trabalho nos Laborat\u00f3rios Bell nos EUA na d\u00e9cada de 1940 tornou poss\u00edvel o sistema global de telefonia e o Compact Disc 40 anos depois, al\u00e9m de abrir o caminho para a compress\u00e3o dos arquivos de \u00e1udio digital previstos em sua \u201cTeoria da Informa\u00e7\u00e3o\u201d.<\/p><div class=\"homet-conteudo\" style=\"text-align: center;\" id=\"homet-964046642\"><div data-cfpa=\"36066\" data-cfpw=\"36066\" id=\"homet-2215214244\"><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>A tecnologia chave est\u00e1 no LPCM (<em>Linear<\/em><em>\u00a0<\/em><em>Pulse Code Modulation<\/em>), onde um sinal de \u00e1udio \u00e9 representado por uma sucess\u00e3o de amostras de maneira similar \u00e0 sucess\u00e3o de fotogramas que d\u00e3o a ilus\u00e3o de movimento cont\u00ednuo no cinema.<\/p>\n<p>O LPCM implementado no CD captura e reproduz 44.100 amostras por segundo, com 16 bits cada (o contraste das cores da imagem na nossa analogia com o cinema), onde um minuto de \u00e1udio est\u00e9reo gera cerca de 10MB de dados.<\/p>\n<p>A ado\u00e7\u00e3o de computadores como equipamentos de \u00e1udio, na d\u00e9cada de 1990, trouxe os algoritmos de compress\u00e3o de arquivos e quase quebrou a ind\u00fastria fonogr\u00e1fica mundial no processo. A compress\u00e3o reduz o tamanho dos arquivos de \u00e1udio e pode ser do tipo <em>lossy<\/em>, que introduz perdas na informa\u00e7\u00e3o original; ou <em>lossless<\/em>, que reproduzem a informa\u00e7\u00e3o original bit a bit.<\/p>\n<p><strong>Comprimir ou n<\/strong><strong>\u00e3<\/strong><strong>o comprimir ?<\/strong><\/p>\n<p>A compress\u00e3o de arquivos de \u00e1udio do tipo <em>lossy<\/em> (\u201ccom perdas\u201d) introduz artefatos sonoros que contaminam e empobrecem a reprodu\u00e7\u00e3o sonora e corroem o conte\u00fado espectral, com mudan\u00e7as espaciais e temporais aud\u00edveis. Al\u00e9m de jogar fora mais de 70 anos de pesquisa e desenvolvimento em \u00e1udio digital!<\/p>\n<p>Tente ler este par\u00e1grafo:<\/p>\n<p><em>Se n pr<\/em><em>\u00e1<\/em><em> tic o c reb <\/em><em>\u00a0<\/em><em>co s gue comp ns r a p rda de inf rma<\/em><em>\u00e7<\/em><em> o ao <\/em><em>\u00a0<\/em><em>er e<\/em><em>\u00a0<\/em><em>ta fra e, o proc s am<\/em><em>\u00a0<\/em><em>nto menta <\/em><em>\u00a0<\/em><em>extra afet<\/em><em>\u00a0\u00a0<\/em><em>a ex<\/em><em>\u00a0<\/em><em>er<\/em><em>\u00a0\u00ea<\/em> <em>\u00a0<\/em><em>ia de ler de for<\/em><em>\u00a0\u00a0<\/em><em>si<\/em><em>\u00a0<\/em><em>la<\/em><em>\u00a0\u00a0<\/em><em>a<\/em><em>\u00a0<\/em><em> que oc<\/em><em>\u00a0<\/em><em>r<\/em><em>\u00a0<\/em><em>e qu<\/em><em>\u00a0<\/em><em>n<\/em><em>\u00a0<\/em><em>o<\/em><em>\u00a0<\/em><em>o<\/em><em>\u00a0<\/em><em>vim <\/em><em>\u00a0\u00a0<\/em><em>um a<\/em><em>\u00a0<\/em><em>qu vo com rimido. S c o ?1)<\/em><\/p>\n<p>A vers\u00e3o correta est\u00e1 no final do artigo. Para quem quiser se aprofundar no assunto, a revista inglesa <strong>Sound on Sound<\/strong>, a b\u00edblia das tecnologias de produ\u00e7\u00e3o musical, esgotou o tema em um fabuloso e sensacional artigo\/workshop, dispon\u00edvel em <a href=\"http:\/\/www.soundonsound.com\/techniques\/what-data-compression-does-your-music\">http:\/\/www.soundonsound.com\/techniques\/what-data-compression-does-your-music<\/a>.<\/p>\n<p>Opte pelos formatos <em>lossless <\/em>(\u201csem perdas\u201d), tais como WAV, AIFF, FLAC e ALAC, sempre que poss\u00edvel na hora de ripar um\u00a0CD ou digitalizar um vinil. Mais sobre eles no pr\u00f3ximo post.<\/p>\n<p>E use HDs maiores e divida o seu playlist\u00a0entre diversos players. O investimento vale a pena.<\/p>\n<p>E,\u00a0mais importante de tudo, mantenha arquivos de \u00e1udio com compress\u00e3o <em>lossy<\/em> fora do alcance das crian\u00e7as e adolescentes.<\/p>\n<p><strong><em>(1)<\/em><\/strong><em>Se na pr<\/em><em>\u00e1<\/em><em>tica o c<\/em><em>\u00e9<\/em><em>rebro<\/em><em>\u00a0<\/em><em>consegue compensar a perda de informa<\/em><em>\u00e7\u00e3<\/em><em>o ao ler esta frase, o processamento mental<\/em><em>\u00a0<\/em><em>extra afeta<\/em><em>\u00a0<\/em><em>a experi<\/em><em>\u00ea<\/em><em>ncia de ler de forma similar ao que ocorre quando ouvimos um arquivo comprimido com perdas. Sacou?<\/em><\/p>\n<p><strong>*<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><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Alexandre Algranti \u00e9 o Chief Headphone Officer do site\u00a0fonesdeouvido.com.br. Leitores deste blog tem 10% de desconto em qualquer compra no site com o c\u00f3digo HT2018.<\/p>\n","protected":false},"author":1,"featured_media":2661,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,3],"tags":[],"class_list":["post-2657","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 no computador: m\u00fasica com e sem compress\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\/07\/audio-no-computador-musica-com-e-sem-compressao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c1udio no computador: m\u00fasica com e sem compress\u00e3o - HT &amp; Casa Digital\" \/>\n<meta property=\"og:description\" content=\"Alexandre Algranti \u00e9 o Chief Headphone Officer do site\u00a0fonesdeouvido.com.br. 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