Processing of Signal and Spectrum.

The article presents information on the processing of signal and spectrum. The process of finding estimates for the values of a function at new points between known data by computational methods is called interpolation. A fast and simple interpolation method is obtained by the use of Fourier transforms. A measured spectrum generally contains undesired components, noise, in addition to the actual spectrum. An alternative solution for the elimination of high-frequency noise is low-pass filtering. Low-pass filtering is a special case of band-pass filtering, which filters away all other frequencies of the spectrum than the desired bands containing information.