We applied the MEM (Maximum Entropy Method) and the LOMEP (Line Shape Optimized Maximum Entropy Linear Prediction) method to interferogram data that had a large number of sampled points. The LOMEP method has recently developed by J.K. Kauppinen et al. [Appl. Spectrosc. 45, 411 (1991).]. In order to carry out the procedures, the number of sampled points was reduced by means of a numerical heterodyne technique. We are able to obtain a highly resolved spectrum for a small fraction of a full spectrum. The principal advantages of heterodynning are the reduction of the computation time as well as the enhancement of the reliability of the spectrum estimation. The usefulness was verified by applying to the actual spectrum data of carbon tetrachloride in FT-Raman spectroscopy and chlorobenzene in FT-IR spectroscopy. A comparative study between the MEM and LOMEP method is also presented.
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