Calculates the stage parameters. An example is given below.
Support is defined in [A. C. Gade, "Investigations on musicians room acoustic conditions in concert halls, II: Field experiments and synthesis of results," Acustica, vol. 69, pp. 249-62 (1989)] as:
where it is assumed that the response is measured with an omni-directional microphone at a distance of 1m from the source. The time limits are td, the direct time, te, the early time, and tl, the late time. ST1 is defined with direct time 10 ms, early time 20 ms and late time 100 ms.