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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.
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.
Windowed envelopes save the expense of printing or labor of addressing, and in addition save time in preparing the message for dispatch when the customary addresses are already on the letter paper itself. Calling it the "outlook envelope", Americus F. Callahan of Chicago was the first to patent the windowed envelope. [83] U.S. patent #701,839 ...
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.
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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: [ a] For digital signal processing, the function is sampled symmetrically (with spacing and amplitude ): which is a sequence of samples, and can be even or ...
cwct .co .uk. The Centre for Window and Cladding Technology (CWCT) is a publisher of standards and guidance only (not regulations), on corrosion, intrusion, fenestration, weather and fire resistance, acoustic and impact performance, of building envelopes, facades, cladding and glazing. Founded in 1989 and based in Bath, Somerset, [1] the CWCT ...
A spectral envelope is the envelope curve of the spectrum density. It describes one point in time (one window, to be precise). For example, in remote sensing using a spectrometer, the spectral envelope of a feature is the boundary of its spectral properties, as defined by the range of brightness levels in each of the spectral bands of interest.
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