Transients in reconfigurable DSP systems

Nowadays in solving measurement and control problems the processing of input data is performed typically by model-based digital signal processing (DSP) systems which contain a representation of our knowledge about the nature and the actual circumstances of the problem in hand. If the nature and/or the actual circumstances change the corresponding model should also be changed. Similarly, if due to measurements the amount of knowledge about the problem increases, an improved model can be suggested which provides better performance. As a consequence the real-time adaptation or reconfiguration of the DSP system to be applied can hardly be avoided. In this paper the transients caused by these adaptations/reconfigurations is investigated. It is shown that in the case of feedback systems, i.e. for infinite impulse response (IIR) filters these transients are strongly structure-dependent and that the so-called orthogonal filter structures provide good performance also in this respect