Sistema de som Movietone

Esquerda: trilha Movietone com densidade variável. Direita: Pista de área variável.

O sistema de som Movietone é um método óptico de gravação de som em filmes que garante a sincronização perfeita entre a imagem e o áudio. As patentes foram adquiridas em 23 de Julho de 1926 pela Fox Film. Para alcançar essa sincronização, o sistema grava o som como uma faixa óptica de densidade variável na mesma tira de filme que captura as imagens. A versão inicial era capaz de uma resposta de frequência de 8500 Hz. Embora os filmes sonoros de hoje usem trilhas de área variável, qualquer cinema moderno (excluindo aqueles que fizeram a transição para o cinema digital) pode reproduzir um filme Movietone sem modificações no projetor (embora se a unidade de som do projetor tiver sido equipada com LED vermelho ou fontes de luz laser, a qualidade de reprodução de uma faixa de densidade variável será significativamente prejudicada). Movietone foi um dos quatro sistemas de som de filmes em desenvolvimento nos Estados Unidos durante a década de 1920, sendo os outros DeForest Phonofilm, Warner Brothers' Vitaphone e RCA Photophone, embora Phonofilm fosse principalmente uma versão inicial do Movietone.[1][2][3]

Referências

  1. MOTION PICTURE SOUND - PART 1 - web.archive.org
  2. «Home». Cayuga Museum of History and Art (em inglês). Consultado em 31 de dezembro de 2022 
  3. Earl I. Sponable, "Historical Development of Sound Films", The Journal of the Society of Motion Picture Engineers (April 1947)

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