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Unidirectional Sound Signage for Speech Frequency Range Using Multiple Loudspeaker Reproduction System

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Figure

Figure 1. Proposed simple multiple-loudspeaker system for unidirectional reproduction system
Figure 2. Propagation characteristics of a single loudspeak- er, i.e., primary loudspeaker; red solid line denotes 100 Hz, black dash-dotted line denotes 300 Hz, brown dash-dotted line denotes 500 Hz, and blue dotted line denotes 1000 Hz
Figure 4. Unidirectional pattern of multiple-loudspeaker system in the front-back configuration, or P0-S180, at 100 Hz, 300 Hz, and 600 Hz; red dashed line denotes performance without control and black solid line denotes performance under control
Figure 6. Configuration of unidirectional propagation measurement in hemisphere.
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