si-correction filters for D/A-converter

The spectrum of a D/A converter output signal is rated with an si-function. Therefore it is necessary to use an si-correction filter in addition to a low-pass filter for the errorless signal reconstruction. Six easy to realize si-correction filters that suffice most practical requirements are presented. Besides that, for each of the six filters an all-pass filter was designed. This all-pass can be inserted behind the si-correction filter if the group delay equalisation for a low-pass and the si-correction filter cannot be performed with a single network.