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Passive Acoustic Source Localization at a Low Sampling Rate Based on a Five-Element Cross Microphone Array.

Kan Y, Wang P, Zha F, Li M, Gao W, Song B - Sensors (Basel) (2015)

Bottom Line: On the one hand, simulation results show that absolute errors of the source locations based on the US-GCC method with an interpolation factor of 15 are approximately from 1/15- to 1/12-times those based on the GCC method, when the initial same sampling rates of both methods are 8 kHz.On the other hand, a simple and small portable passive acoustic source localization platform composed of a five-element cross microphone array has been designed and set up in this paper.The experiments on the established platform, which accurately locates a three-dimensional (3D) near-field target at a low sampling rate demonstrate that the proposed method is workable.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China. kyh_7372@163.com.

ABSTRACT
Accurate acoustic source localization at a low sampling rate (less than 10 kHz) is still a challenging problem for small portable systems, especially for a multitasking micro-embedded system. A modification of the generalized cross-correlation (GCC) method with the up-sampling (US) theory is proposed and defined as the US-GCC method, which can improve the accuracy of the time delay of arrival (TDOA) and source location at a low sampling rate. In this work, through the US operation, an input signal with a certain sampling rate can be converted into another signal with a higher frequency. Furthermore, the optimal interpolation factor for the US operation is derived according to localization computation time and the standard deviation (SD) of target location estimations. On the one hand, simulation results show that absolute errors of the source locations based on the US-GCC method with an interpolation factor of 15 are approximately from 1/15- to 1/12-times those based on the GCC method, when the initial same sampling rates of both methods are 8 kHz. On the other hand, a simple and small portable passive acoustic source localization platform composed of a five-element cross microphone array has been designed and set up in this paper. The experiments on the established platform, which accurately locates a three-dimensional (3D) near-field target at a low sampling rate demonstrate that the proposed method is workable.

No MeSH data available.


The signal preprocessing circuit includes two amplifying circuits and a two-level filtering circuit.
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f9-sensors-15-13326: The signal preprocessing circuit includes two amplifying circuits and a two-level filtering circuit.

Mentions: The signal preprocessing circuit (as shown in Figure 9) is designed to amplify and filter weak output signals from five microphones. For a speech signal with a general frequency range from 300 to 3400 Hz and a wider pass-band width, a low pass filter and a high pass filter are exploited to remove noises, and also, their cutoff frequencies are 3400 Hz and 300 Hz, respectively. Moreover, the second amplifying of the two amplifying circuits (total amplification factor: 20) is employed following the two-level filtering circuit later.


Passive Acoustic Source Localization at a Low Sampling Rate Based on a Five-Element Cross Microphone Array.

Kan Y, Wang P, Zha F, Li M, Gao W, Song B - Sensors (Basel) (2015)

The signal preprocessing circuit includes two amplifying circuits and a two-level filtering circuit.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507621&req=5

f9-sensors-15-13326: The signal preprocessing circuit includes two amplifying circuits and a two-level filtering circuit.
Mentions: The signal preprocessing circuit (as shown in Figure 9) is designed to amplify and filter weak output signals from five microphones. For a speech signal with a general frequency range from 300 to 3400 Hz and a wider pass-band width, a low pass filter and a high pass filter are exploited to remove noises, and also, their cutoff frequencies are 3400 Hz and 300 Hz, respectively. Moreover, the second amplifying of the two amplifying circuits (total amplification factor: 20) is employed following the two-level filtering circuit later.

Bottom Line: On the one hand, simulation results show that absolute errors of the source locations based on the US-GCC method with an interpolation factor of 15 are approximately from 1/15- to 1/12-times those based on the GCC method, when the initial same sampling rates of both methods are 8 kHz.On the other hand, a simple and small portable passive acoustic source localization platform composed of a five-element cross microphone array has been designed and set up in this paper.The experiments on the established platform, which accurately locates a three-dimensional (3D) near-field target at a low sampling rate demonstrate that the proposed method is workable.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China. kyh_7372@163.com.

ABSTRACT
Accurate acoustic source localization at a low sampling rate (less than 10 kHz) is still a challenging problem for small portable systems, especially for a multitasking micro-embedded system. A modification of the generalized cross-correlation (GCC) method with the up-sampling (US) theory is proposed and defined as the US-GCC method, which can improve the accuracy of the time delay of arrival (TDOA) and source location at a low sampling rate. In this work, through the US operation, an input signal with a certain sampling rate can be converted into another signal with a higher frequency. Furthermore, the optimal interpolation factor for the US operation is derived according to localization computation time and the standard deviation (SD) of target location estimations. On the one hand, simulation results show that absolute errors of the source locations based on the US-GCC method with an interpolation factor of 15 are approximately from 1/15- to 1/12-times those based on the GCC method, when the initial same sampling rates of both methods are 8 kHz. On the other hand, a simple and small portable passive acoustic source localization platform composed of a five-element cross microphone array has been designed and set up in this paper. The experiments on the established platform, which accurately locates a three-dimensional (3D) near-field target at a low sampling rate demonstrate that the proposed method is workable.

No MeSH data available.