| 摘要 |
PURPOSE:To provide an excellent directivity-controlled loudspeaker system by providing plural loudspeaker units arranged in nearly a line or plane and devices which input signals to which a prescribed load function is applied to the units. CONSTITUTION:In case loudspeaker units 1 are linearly arranged at regular intervals of, for example, 15cm, amplifiers 2 are provided to each loudspeaker pair at the same distance from the center and input level (gain) setters 3 are connected to a signal source 4. In addition, the equation shown in the figure is used as the load function applied to the input level of each unit 1. When the function is set so that the function can become the cosine function of n=1, the frequency characteristic in the service area becomes flat and, in addition, the side lobe outside the service area becomes lower. The value of the (n) is not restricted to '1', but can be set to an arbitrary positive number. Therefore, when such a load function is applied that the level at its central section is higher and level at its peripheral section is lower, the contribution from the speaker unit at the peripheral section becomes lower. |
