# Translations:Band-limiting root approximation/7/en

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where *n* (representing the number of high-pass factors) and *m* (representing the number of low-pass factors) are constant integers. The amplitude spectrum corresponding to expression 7 is smooth and unimodal, and it shifts its peak to higher frequencies as *n*, is increased and to lower frequencies as *m* is increased. For specific values of *n* and *m*, the resulting waveform is antisymmetric whenever *n* is odd. For even values of *n*, the waveform is symmetric. Neidell introduced expression 7 as the band-limiting root approximation (BLRA) to explain many properties of postprocessing seismic wavelets.