Quantisation and rounding problems in digital filters
Trevor J. Terrell, E.T. Powner · Institution of Engineering and Technology eBooks · 1990
It has been shown that quantisation and rounding errors sometimes have considerable effects on the performance of digital filters, and therefore it is important that these are taken into account when considering their practical implementation. In this respect, to achieve adequate precision for the signal and number representation, a good estimate of the required processor word length must be made, and, if possible, a safety factor should be used so that three or four bits are added to the estimated word length.