System and a method for detecting the direction of arrival...

Details System and a method for detecting the direction of arrival... System and a method for detecting the direction of arrival...

2008-04-22

2008-04-22

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With time interval measuring means

Reexamination Certificate

active

11135454

ABSTRACT:
The disclosed invention is a highly reliable cost effective sound direction detection system. In the preferred embodiment of the invention the system comprises a device which includes two microphones set at a spread of at lease 5 cm from each other, a digital signal processing (DSP) and a command processing board. A pattern recognition algorithm allows the system to recognize the signal of an actual event and distinguish it from echoes and reflections according to several parameters such as the signal's time of arrival, energy, amplitude levels and frequency. The pattern of the recorded signals is analyzed according to prevalent signal patterns and then the real event can be identified. By identifying the signal of the sound event and distinguishing it from background noises and from its reflections, the system can calculate its direction of arrival (DOA) using classical sound direction detection methods.

REFERENCES:
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Godara; Limitations and Capabilities of Directions-of-Arrival Estimation Techniques using an Array of Antennas: A Mobile Perspective; 1996; IEEE; pp. 327-333.

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