A-weighting

This function applies to a frequency response the standardised (DIN EN 61672-1:2003-10) A-filter. The phase is not affected by this. In contrast to A-filtering (IIR) the shape of the filter is independent from the sampling frequency and runs centred within the tolerance limits of the standard.

This function can only be applied once to a frequency response and is then blocked until A-unweighting is executed.