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  2. History of PDF - Wikipedia

    en.wikipedia.org/wiki/History_of_PDF

    The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008.

  3. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    This is an accepted version of this page This is the latest accepted revision, reviewed on 13 November 2024. Portable Document Format, a digital file format For other uses, see PDF (disambiguation). Portable Document Format Adobe PDF icon Filename extension.pdf Internet media type application/pdf, application/x-pdf application/x-bzpdf application/x-gzpdf Type code PDF (including a single ...

  4. List of file formats - Wikipedia

    en.wikipedia.org/wiki/List_of_file_formats

    KERN – Kern File Format sheet music file; LY – LilyPond sheet music file; MEI – Music Encoding Initiative file format that attempts to encode all musical notations; MIDI – MIDI file format that is a music sheet for instruments; MUS, MUSX – Finale sheet music file; MXL, XML – MusicXML standard sheet music exchange format

  5. Potato chip - Wikipedia

    en.wikipedia.org/wiki/Potato_chip

    At first, potato chips were packaged in barrels or tins, which left chips at the bottom stale and crumbled. In the 1920s, Laura Scudder, [31] [32] [33] an entrepreneur in Monterey Park, California, started having her workers take home sheets of wax paper to iron into the form of bags, which were filled with chips at her factory the next day ...

  6. Timeline of music technology - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_music_technology

    This device contributed to electric technologies that would subsequently be used in music technology) 1877 : The microphone was first invented by David Edward Hughes, despite Thomas Edison being granted the patent. Hughes discovered that electrical currents varied when sound vibrations were passed through carbon packed into a confined space.

  7. Optical music recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_music_recognition

    Optical music recognition has frequently been compared to Optical character recognition. [2] [10] [11] The biggest difference is that music notation is a featural writing system. This means that while the alphabet consists of well-defined primitives (e.g., stems, noteheads, or flags), it is their configuration – how they are placed and ...

  8. Writing system - Wikipedia

    en.wikipedia.org/wiki/Writing_system

    Throughout history, each writing system invented without prior knowledge of writing gradually evolved from a system of proto-writing that included a small number of ideographs, which were not fully capable of encoding spoken language, and lacked the ability to express a broad range of ideas.

  9. Music manuscript - Wikipedia

    en.wikipedia.org/wiki/Music_manuscript

    Music manuscripts are handwritten sources of music. Generally speaking, they can be written on paper or parchment . If the manuscript contains the composer 's handwriting it is called an autograph .