Abstract

The pseudofilter is a new instrumental concept which fills a gap between real and digital filters. The idea was originally motivated by the desire to develop frequency filters in the direction of ω1(f1) in 2D NMR. The filter mechanism relies strictly on the accumulation of repeated coherent signals; therefore only the sensitivity gain results without reduction of noise. Applications are (1) a 2D filter to cut unnecessary time-domain signals, (2) a J filter in 13C-1H shift correlation, and (3) an ideal filter in 1 D and 2D NMR.

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