ABSTRACT
Based on the theory dealt with in the last chapter we shall now deal with practi-cal systems and operations. In this I have consciously limited myself to electric and electronic systems, analog and digital. For the treatment of subjects from electro-acoustics I refer to the vast supply of literature in this field. The subdivision of this chapter is based upon the classification of systems dealt with in chapter 5. I shall thus first pay attention to linear systems (distortion-less systems and filters) and then to non-linear systems. Before I begin to deal with the treatment of concrete electrical systems I would like first to summarize some elementary facts and formulae for such systems.
