Any of the evergreen, coniferous trees of the genus Abies Represented in the North Country by the Balsam Fir (Abies balsamea) From the Old English fyre
Flight Information Region - A three-dimensional area in which aircraft are under control of usually a single authority Internally a FIR is divided into several geographical areas called sectors Sometimes one or more FIRs have a combined upper area control This is for example the case in the Dutch FIR where UAC (Upper Area Control) is done by ACC (below flight level 245) and Eurocontrol (above flight level 245) See for example the Dutch FIR
- Indicates a noun that represents a type of person or thing that is anthropomorphized in some way For example, zhadfir is "Earther," larifir is "wind-bringer "
A fir or a fir tree is a tall evergreen tree that has thin needle-like leaves. a tree with leaves shaped like needles that do not fall off in winter. Properly, any of about 40 species of trees that make up the genus Abies, in the pine family. Many other evergreen conifers (e.g., Douglas fir, hemlock fir) are also commonly called firs. True firs are native to North and Central America, Europe, Asia, and northern Africa. They are distinguished from other genera in the pine family by their needlelike leaves, which grow directly from the branch and have bases, shaped like suction cups, that leave conspicuous circular scars when the leaves fall. North America boasts 10 native species of fir, found chiefly from the Rocky Mountains westward. The wood of most western North American firs is inferior to that of pine or spruce but is used for lumber and pulpwood. Of the two fir species that occur in the eastern U.S. and Canada, the better known is the balsam fir (A. balsamea), a popular ornamental and Christmas tree
Finite Impulse Response -- a class of filters commonly used in signal processing Given a sequence of inputs X0, X1, X2 , we calculate an output sequence Y0, Y1, Y2 , using an equation of the form: Yi=W0*Xi+ W1*Xi-1+ W2*Xi-2+ Wk-1*Xi-k+1 Note that if we provide an impulse as input to the FIR (say something that is 1 at Xj and 0 everywhere else), we will get a finite output After output Yj+k, the output will no longer be affected by the impulse input on cycle j --- hence the name, Finite Impulse Response