Sine bell for truncation

The sine bell is a window function commonly used to enhance the appearance of truncated data, such as often recorded for multidimensional NMR spectra. The sine bell ensures the signal decays to zero and fourier transformation will not produce artifacts. Shifting the sine bell also allows some resolution enhancement to be applied.

Gaussian multiplication for resolution enhancement

When processing NMR data a window function, or apodisation, is typically applied to emphasise or deemphasise certain aspects of the spectrum. Numerous window functions are available each with their own benefits and drawbacks. A gaussian multiplication is often applied to 1D data to increase resolution at the expense of sensitivity.