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  2. Pulse-width modulation - Wikipedia

    en.wikipedia.org/wiki/Pulse-width_modulation

    It was intended to reduce noise when playing back a film soundtrack. The proposed system had a threshold between "white" and "black" parts of soundtrack. [3] One early application of PWM was in the Sinclair X10, a 10 W audio amplifier available in kit form in the 1960s. At around the same time, PWM started to be used in AC motor control. [4]

  3. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS.It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA).

  4. List of spreadsheet software - Wikipedia

    en.wikipedia.org/wiki/List_of_spreadsheet_software

    Apple iWork Numbers, included with Apple's iWork '08 suite exclusively for Mac OS X v10.4 or higher. AppleWorks – for MS Windows and Macintosh. This is a further development of the historical Claris Works Office suite. WordPerfect Office Quattro Pro – for MS Windows. Was one of the big three spreadsheets (the others being Lotus 123 and Excel).

  5. Comparison of office suites - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_office_suites

    Yes indicates that the office suite has been officially released in a fully functional, stable version. Dropped indicates that while the office suite works, new versions are no longer being released for the indicated OS; the number in parentheses is the last known stable version which was officially released for that OS.

  6. List of Microsoft Office filename extensions - Wikipedia

    en.wikipedia.org/wiki/List_of_Microsoft_Office...

    .xlt – Legacy Excel templates; officially designated "Microsoft Excel 97–2003 Template".xlm – Legacy Excel macro; OOXML Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Excel ever since. Excel-related file extensions of this format include:.xlsx – Excel workbook

  7. Space vector modulation - Wikipedia

    en.wikipedia.org/wiki/Space_vector_modulation

    Space vector modulation (SVM) is an algorithm for the control of pulse-width modulation (PWM), invented by Gerhard Pfaff, Alois Weschta, and Albert Wick in 1982. [1] [2] It is used for the creation of alternating current (AC) waveforms; most commonly to drive 3 phase AC powered motors at varying speeds from DC using multiple class-D amplifiers.

  8. History of Microsoft Office - Wikipedia

    en.wikipedia.org/wiki/History_of_Microsoft_Office

    Office 4.2 Word 6, Excel 5, PowerPoint 4, Mail 3.2. 1994 Office 4.2.1 Word 6, Excel 5, PowerPoint 4, etc. First release designed for the PowerPC, final release for m68k. March 25, 1998 Office 98 (8.0) Word, Excel, PowerPoint 98 October 11, 2000 Office 2001 (9.0 Word, Excel, Entourage and PowerPoint 2001 Final release for Mac OS 9, latest update ...

  9. Comparison of spreadsheet software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_spreadsheet...

    The operating systems the software can run on natively (without emulation).Android and iOS apps can be optimized for Chromebooks and iPads which run the operating systems ChromeOS and iPadOS respectively, the operating optimizations include things like multitasking capabilities, large and multi-display support, better keyboard and mouse support.