Sound reproducing apparatus operated by banknotes

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léon scott in , used a vibrating diaphragm and stylus to graphically record sound waves as tracings on sheets of paper, purely for visual analysis and without any intent of playing them back. in the s, these tracings were first scanned by audio engineers and digitally converted into audible sound.

phonautograms of singing and speech made by scott in were played back as sound for the first time in . along with a tuning fork tone and unintelligible snippets recorded as early as , these are the earliest known recordings of sound. in , thomas edison invented the phonograph . unlike the phonautograph...

https://en.wikipedia.org/wiki/Gramophone_record

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body representing more than chartered accountants and students worldwide, icaew offers key insights and expert commentary on the financial and business world. read the latest news, research and reports from icaew here, or get in touch with our media relations team. news releases news releases issued by

icaew in . news releases news releases issued by icaew in . press release archive as a professional body representing more than chartered accountants worldwide, icaew offers key insights and expert commentary on the financial and business world. this is an archive of press releases issued by the icaew...

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