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Geórgia Vanize De Figueiredo Costa¹, Vanessa Cristina Gonçalves¹

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Geórgia Vanize De Figueiredo Costa¹, Vanessa Cristina Gonçalves¹ WMA GEÓRGIA VANIZE DE FIGUEIREDO COSTA¹, VANESSA CRISTINA GONÇALVES¹ 1UFMG – Escola de Ciência da Informação, Curso de Biblioteconomia, Disciplina de Introdução à Informática, Av. Antônio Carlos, 6627, 31270-010, Belo Horizonte, MG, Brasil [email protected] vcgonç[email protected] Resumo. Este artigo tem como tema principal apresentar o formato de arquivo de áudio: WMA, desenvolvido pela Microsoft. Neste, apresenta-se sua história, suas vantagens e uma comparação entre o MP3, arquivo de áudio mais usado atualmente. São apresentados também, os players onde podem ser baixadas as músicas. Além disso, é mostrado como converter para outros formatos como o WAV e o MP3. os arquivos passaram a poder ser gravado sem proteção e 1. Introdução sem interferência na qualidade do som. Embora pouco WMA significa Windows Media Audio , ou seja, são divulgado este padrão de arquivo já começa a aparecer em arquivos de música (áudio digital). Este formato de música vários sites na Internet. Para ouvir um arquivo desse padrão compactada foi criado pela Microsoft, que tenta disputar o você pode usar o Winamp , que é distribuído gratuitamente mercado com o famoso padrão MP3, atual arquivo mais na Internet. popular entre os internautas. O "WMA" tem muitas vantagens, com ele pode-se fazer rádios para escutar 3. Como instalar o Winamp músicas sem precisar fazer download e o mais importante, Com o Winamp você pode tocar arquivos no padrão uma música com 64 Kbps em "WMA" tem a mesma wav, mid, voc e mod, MP3 e CDs musicais. qualidade de uma "MP3" com 128 Kbps, ou seja uma "WMA" tem a mesma qualidade de uma "MP3" e metade Faça o download do Winamp 2.71(última versão) do tamanho. A cada dia a Microsoft investe mais nessa 1) Acesse www.winamp.com/ tecnologia, em breve o "WMA" será o formato mais popular. 2) Clique em Download Winamp 2.71 now! O WMA é famoso por ocupar metade do espaço de 3) Depois clique em Begin Dowanload. um MP3 mantendo excelente qualidade de som, além de ser 4) Na próxima janela deixe marcada a opção o formato mais completo que existe por disponibilizar ao usuário as mais variadas opções de encodificação, tais "Salvar arquivo em disco". como compactação especial para voz, streaming melhor 5) Escolha uma pasta para guardar o arquivo. que o do RealAudio, “Surround Sound” real de 5.1 canais e a melhor compactação “ lossless” , isto é, matematicamente 6) Aguarde a transferência do arquivo. sem nenhuma perda de qualidade em relação ao WAV Para instalar o programa basta ir para o Windows original [1]. Explorer e dar dois cliques sobre o arquivo. Nas próximas telas vá seguindo as instruções do programa, sempre 2. História clicando em Next , até finalizar a instalação. Prontinho, No começo, o que distinguia o WMA era sua proteção, pois você já pode ouvir os arquivos WMA e outros formatos com ele só era permitido que as músicas fossem ouvidas no [2]. computador que as criou, ou seja, um CD gravado no seu computador no padrão WMA só poderia ser tocado/ouvido 4. Como transformar MP3 ou WAV em WMA usando no seu computador. A única vantagem era que um arquivo o Winamp WMA ocupava a metade do espaço de um MP3, com O jeito mais fácil de se produzir um WMA é através do qualidade de som semelhante. Foram criados alguns próprio Winnamp. Abaixo vão os passos para se programas para retirar a proteção dos arquivos WMA, mas transformar um MP3 ou WAV em um WMA com metade isto resultou em perda da qualidade do som e muitas vezes do tamanho de um MP3. Lembrando que isso só funciona os arquivos não abriam. Com o programa Audiograbber 1.5 com o Winnamp versão 2.24 full install : 1-No Winnamp, digite Ctrl+P para abrir a janela de preferências do Winnamp. 2-Clique no sub-item “Output” que está ligado a "Plug-ins". 3-Na lista que aparece, clique em “NullSoft” WMA Output plug-in....[OUT_WM. DLL] e depois aperte o botão Figura 2. Tela principal do Sonique. "Configure". Windows Média Player: O Player da empresa que criou o 4-Clique o botão "Output directory" para escolher a WMA, a Microsoft. Não possui editor de playlist nem pasta de destino onde o WMA será gravado. plug-ins [1]. 5-Em "Output format" escolha o seguinte: Samplerate =44100Hz, BITRATE=64kbps, Channels=Stereo. 6-Aperte Close para sair da janela de configurações do plug-in e depois aperte Close para sair da janela de Figura 3. Tela principal do Windows Media Player. preferências. 7-IMPORTANTE: Se você usa algum plug-in de efeitos sonoros, DESLIGUE-O. DESLIGUE TAMBEM O 6. Comparação entre MP3 E WMA [5] EQUALIZADOR (EQ) do Winamp . Caso contrário o WMA será gravado com todos esses efeitos incluídos que MP3 WMA irá distorcer o som. Tempo médio de download de uma 8-Agora basta tocar o MP3 ou o WAV desejado da 34 17 música inteira pela maneira convencional. Ao invés de tocar, o Winamp minutos minutos automaticamente irá gravar o WMA no disco, em Internet (conexão velocidade acima do normal. Você também pode converter 2kbps) uma playlist inteira se quiser. Média de 170 340 músicas em um único 9- Depois que gravar os WMAs, volte para a janela de músicas músicas “Output Plug-ins ” e clique em Nullsoft waveOut plug-in CD [OUT_WAVE.DLL] para tocar as músicas ao invés de Média de gravar WMA [3]. músicas de alta 10 20 qualidade em players músicas músicas* 5. Players para WMA portáteis com 32MB de memória Aqui estão alguns players para usuários do windows, logo estarão disponível players para outros sistemas Figura 3. Tela principal do Windows Media Player. operacionais. Winnamp 2.5 full: O Melhor player para WMA, nas ultimas versões com suporte para WMA, peça fundamental 7. Referência no sucesso do WMA. [1] www.centralwma..hpg.ig.com.br site de Internet, acessado em 08/05/2005 às 14:16 [2] www.nosachamos.com/nota10/top/WMA.html site da internet, acessado em 12/05/2005 às 17:10 [3 http://orbita.starmedia.com/mmcpage/info.htm site da internet, acessado em 08/05/2005 ás 16:05 [4] http://marcomm.webhostme.com/wma/wmafaq.asp#O%20que%20é% 20WMA site da Internet, acessado em 05/06/2005 às 16:43 Figura 1. Tela principal do Winamp 2.5 full [5] http://marcomm.webhostme.com/wma/wmamp3.asp site de Internet, Sonique: O Sonique está em segundo lugar na preferência acessado em 08/05/2005 às 15:38 popular. Seus skins são fantásticos assim como seus efeitos visuais. Perde por não ter a mesma disponibilidade de plug- ins que o Winamp . .
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