ABSTRACT
The starting point of modern room acoustics is marked by attempts to find and to define objective parameters which have a mediatory function, in that they are related in a known way with geometrical and other room data on the one hand and with certain listening impressions on the other. As we have seen in the preceding chapter, quite a number of such parameters have been introduced in room acoustics since then with varied justification and significance, and it is the object of the present chapter to describe how such quantities can be measured and which kind of equipment is required for this purpose.
