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Alec Fermin filed the first patent describing Pulse-code modulation.
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In 1943, Bell Telephone Laboratories developed the first digital scrambled speech transmission system.
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In 1957, Max Matthews of Bell develops the process to digitally record sound with a computer.
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The first digital audio magnetic tape recorder was invented in 1967. A 12-bit 30kHz stereo device using a compander to extend the dynamic range
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In 1975, Thomas Stockham made the first digital audio recordings using standard computer equipment and developed a digital audio recorder of his own design. This was the first of it's kind to be offered commercially.
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In 1982, The first digital compact disc are marketed by Sony and Philips, and New England Digital offers the hard disk recorder option on the Synclavier.
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Optical discs and DVD players begin selling in Japan
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Apple released the iPod, which became the most popular MP3 player in history. This plus opening the iTunes Store to distribute music content lead to a disruptive and sweeping change in the music industry.
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Apple CEO Steve Jobs unveiled the Apple iPhone at the MacWorld Conference in San Francisco on 9 January 2007, and announced it would go on sale in late June. The iPhone is a combination widescreen iPod, cell phone and pocket internet device.
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Apple introduced the iPad, another revolution in portable “tablet” computing.
