Patent ID: 8570184

Claim:
A method for guiding, controlling or warning people along a desired travel route leading to a specific point on the route, the method comprising: arranging first audio sources successively at a distance from each other along one or more linear travel directions in the desired travel route leading to the specific point, and activating each of the first audio sources to produce a directional audio signal which is communicated directly against each of the one or more of the linear travel directions of the desired travel route leading to the specific point on the route, the method further comprising: locating a second audio source adjacently to specific ones of the first audio sources located at each of the specific points on the desired travel route which requires a special action, the specific points of the route requiring the special action including an exit, a door, or a staircase, and causing each of the second audio sources at the specific points requiring the special action to produce a second sound signal which is directed straight downwardly from above, thereby distinguishing the second sound signal, which is directed downwardly from above, from the directional audio signal of the adjacent first audio source, which is communicated directly against each of the one or more of the linear travel directions.