Abstract
In this paper, technology for the control of the sound field in an auditorium by electro-acoustic means, A-SF (Assistance of Sound Field), is described. The A-SF is one of the AFC (Active Field Control) technologies which have made rapid progress due to the latest advances in digital signal processing, and is characterized by an acoustic feedback loop in the system. Methods for handling loop gain, G c (ω), to increase loudness, reverberance, spatial impression, etc., as well as technological problems, are presented on the basis of actual examples and reference to the various existing systems. In particular, the AAS (Assisted Acoustics System), developed by the Yamaha group, is used in a detailed discussion on the validity of A-SF system with an FIR filter in the feedback loop. Finally, the possibility of using an adaptive filter in A-SF is touched on.
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