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The United Kingdom patent 394325 'Improvem … The United Kingdom patent 394325 'Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems' is a fundamental work on stereophonic sound, written by Alan Blumlein in 1931 and published in 1933. The work exists only in the form of a patent and two accompanying memos addressed to Isaac Shoenberg. The text is exceptionally long for a patent of the period, having 70 numbered claims. It contains a brief summary of sound localization theory, a roadmap for introduction of surround sound in sound film and recording industry, and a description of Blumlein's inventions related to stereophony, notably the matrix processing of stereo signals, the Blumlein stereo microphone and the 45/45 mechanical recording system. In 1933–1935 Blumlein built experimental stereo recording equipment and recorded two sets of stereo recordings using mechanical and optical media. Commercial implementation of his invention became a reality in the late 1950s, when the patent had expired. Blumlein's 45/45 system became a worldwide standard for stereo LP records, and Blumlein himself was proclaimed "the inventor of stereo".f was proclaimed "the inventor of stereo".
, Патент Великобритании № 394325 «Усовершенс … Патент Великобритании № 394325 «Усовершенствования систем передачи, записи и воспроизведения звука» (англ. Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems) — фундаментальная работа Алана Блюмлейна по вопросам стереофонической записи и воспроизведения звука, написанная в 1931 году и опубликованная в 1933 году. Текст, существующий только в форме патента и поясняющих его служебных записок, включает изложение психоакустической теории стереофонии, программу практических шагов по внедрению стереофонии в звуковое кино и индустрию звукозаписи и описание изобретённых Блюмлейном технологий, из которых важнейшими являются матричная обработка суммарных и разностных составляющих стереосигнала и система двухкомпонентной стереофонической грамзаписи 45/45. Формула изобретения содержит беспрецедентные 70 пунктов. В 1933—1935 годы Блюмлейн построил опытные стереофонические тракты записи-воспроизведения и записал две серии стереофонограмм — на механические и оптические носители. Идеи изобретателя опередили своё время на четверть века: промышленное производство стереофонических пластинок стало реальностью лишь во второй половине 1950-х годов, когда срок охраны патента уже истёк. Блюмлейновская система записи 45/45 стала мировым стандартом стереофонической грамзаписи, а сам изобретатель получил посмертное признание как «изобретатель стереофонии», точнее — долгоиграющей стереофонической грампластинки, основного формата звукозаписывающей индустрии в 1960—1980-е годы.записывающей индустрии в 1960—1980-е годы.
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Addition and subtration forms new channels L"=M+S" and R"=M-S", which have exactly same phase but different levels. L" is higher than R", thus the image is localized to the left
, After shifting S by 90°, the new side signal S" is either in phase with M or has the opposite polarity
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, Left and right binaural signals. R lags behind L, thus the image is localized to the left
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, --07-21
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Blumlein's films from the Abbey Road Studios archive
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Trains in Hayes. This is a short, 44-second fragment of a 5-minute original . The small white "flags" on the poles are the wind screen of ribbon microphones.
, Walking and Talking. Blumlein, wearing spectacles and a light grey suit, appears at the end of the roll.
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Патент Великобритании № 394325 «Усовершенс … Патент Великобритании № 394325 «Усовершенствования систем передачи, записи и воспроизведения звука» (англ. Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems) — фундаментальная работа Алана Блюмлейна по вопросам стереофонической записи и воспроизведения звука, написанная в 1931 году и опубликованная в 1933 году. Текст, существующий только в форме патента и поясняющих его служебных записок, включает изложение психоакустической теории стереофонии, программу практических шагов по внедрению стереофонии в звуковое кино и индустрию звукозаписи и описание изобретённых Блюмлейном технологий, из которых важнейшими являются матричная обработка суммарных и разностных составляющих стереосигнала и система двухкомпонентной стереофонической грамзаписи 45/мпонентной стереофонической грамзаписи 45/
, The United Kingdom patent 394325 'Improvem … The United Kingdom patent 394325 'Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems' is a fundamental work on stereophonic sound, written by Alan Blumlein in 1931 and published in 1933. The work exists only in the form of a patent and two accompanying memos addressed to Isaac Shoenberg. The text is exceptionally long for a patent of the period, having 70 numbered claims. It contains a brief summary of sound localization theory, a roadmap for introduction of surround sound in sound film and recording industry, and a description of Blumlein's inventions related to stereophony, notably the matrix processing of stereo signals, the Blumlein stereo microphone and the 45/45 mechanical recording system.and the 45/45 mechanical recording system.
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Патент Великобритании № 394325
, United Kingdom patent 394325
|
