Abstract:

By the control of time delay and the frequency function of each speaker in an array, the direction and coverage as a function of frequency can be controlled. Beamwidth can be held constant with frequency so that everyone in the coverage area will receive the same spectrum of sound. Examples of one-dimensional beam control will be presented using broadside and endfire line arrays. Then two-dimensional coverage control with crossed broadside and stacked endfire arrays will be demonstrated. Advantages of controlled loudspeaker arrays will be discussed.