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  2. Windowed envelope - Wikipedia

    en.wikipedia.org/wiki/Windowed_envelope

    Windowed envelope. US Patent 701,839 for a windowed envelope. Modern envelope with a single window for the recipient address. A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene [1] plastic film) window to allow the recipient's address to be printed on the paper contained within.

  3. Overton window - Wikipedia

    en.wikipedia.org/wiki/Overton_window

    The Overton window is an approach to identifying the ideas that define the spectrum of acceptability of governmental policies. It says politicians can act only within the acceptable range. Shifting the Overton window involves proponents of policies outside the window persuading the public to expand the window. Proponents of current policies, or ...

  4. Window function - Wikipedia

    en.wikipedia.org/wiki/Window_function

    In signal processing and statistics, a window function (also known as an apodization function or tapering function[ 1]) is a mathematical function that is zero-valued outside of some chosen interval. Typically, window functions are symmetric around the middle of the interval, approach a maximum in the middle, and taper away from the middle.

  5. Envelope - Wikipedia

    en.wikipedia.org/wiki/Envelope

    An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

  6. Hann function - Wikipedia

    en.wikipedia.org/wiki/Hann_function

    The Hann function is named after the Austrian meteorologist Julius von Hann. It is a window function used to perform Hann smoothing. [ 1] The function, with length and amplitude is given by: For digital signal processing, the function is sampled symmetrically (with spacing and amplitude ): which is a sequence of samples, and can be even or odd ...

  7. First it was brat summer.Now social media users are forecasting we're headed into demure fall. Being “very demure” is TikTok's latest trend, and it's all about being mindful, not doing too ...

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