Abstract
Sound signals have been widely applied in various fields. One of the popular applications is sound localization, where the location and direction of a sound source are determined by analyzing the sound signal. In this study, two microphone linear arrays were used to locate the sound source in an indoor environment. The TDOA is also designed to deal with the problem of delay in the reception of sound signals from two microphone arrays by using the generalized cross-correlation algorithm to calculate the TDOA. The proposed microphone array system with the algorithm can successfully estimate the sound source’s location. The test was performed in a standardized chamber. This experiment used two microphone arrays, each with two microphones. The experimental results prove that the proposed method can detect the sound source and obtain good performance with a position error of about 2.0~2.3 cm and angle error of about 0.74 degrees. Therefore, the experimental results demonstrate the feasibility of the system.
Highlights
The compressive theory [38] of the microphone array sound source localization method has better noise immunity compared to the traditional localization method
Most methods of sound source localization are implemented in two steps with compressive technology
For accuracy, ref. [38] proposed a microphone array source localization method based on CS theory
Summary
Localization technologies have been widely used in applications such as intelligent warehousing and logistics [1,2], service robots [3–5], shopping mall navigation [6], disaster prevention and relief [7,8], and home care [9,10]. GPS can block signal propagation in an indoor environment because of obstacles, degrading its accuracy. Many approaches have been proposed for solving the indoor positioning problem, such as Bluetooth, infrared (IR), and Wi-Fi. IR demonstrates the advantage of high positioning accuracy, but the signal is blocked by obstacles, which affects the positioning effect. Bluetooth and Wi-Fi are less affected by obstacles due to their high penetration ability. Bluetooth has the disadvantage of short propagation distance, and Wi-Fi costs more due to hardware installation and maintenance. These wireless devices rely on a person to carry a corresponding transmitting signal device for positioning. The advantages of acoustic localization are penetrating power, simple structure, and low cost
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