A Smartphone-Based Passive Sound Source Localization Method
A smart phone and sound source positioning technology, applied in positioning, measuring devices, instruments, etc., can solve the problems of high energy consumption, high cost, and unavoidable measurement errors, etc., and achieve the effects of broad prospects, low cost, and convenient networking
Active Publication Date: 2017-12-26
ZHEJIANG UNIV
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[0003] Research institutions at home and abroad have proposed many practical technical solutions for the location of the target sound source, which can be classified into two categories according to the characteristics of the hardware platform: the first category is to design a dedicated hardware module, and use wireless signals or other types of signals such as ultrasonic waves to realize the target sound source. Source location, high cost, high energy consumption
The second category uses a general-purpose smart phone as a node, uses the built-in microphone and speaker of the phone, but can only achieve the localization of the main target sound source
It should be pointed out that the existing technical solutions that require clock synchronization between nodes cannot avoid the measurement error caused by the time delay uncertainty between wireless synchronization between nodes and acoustic signal acquisition
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[0037] Based on the original linear frequency modulation signal set in advance and the active self-positioning of the acoustic array based on the smart phone, the present invention uses statistical decision theory and voice activity detection (VAD) to combine the observed sound source signals. Detect and obtain the TDOA between the passive target sound source and the mobile phone, with high precision, low cost and strong flexibility.
[0038] The passive sound source localization method based on smart phone of the present invention comprises the following steps:
[0039] 1. Use the smartphone as the node of the acoustic array sensor network, deploy the acoustic array sensor network systematically, and establish a wireless local area network;
[0040] The method includes a sensor network composed of a control node and several fixed-position beacon nodes, and each node is a smart phone. Due to the limited performance of the smartphone's built-in microphone and speaker, the sens...
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The invention discloses a passive acoustic source localization method based on an intelligent mobile phone. The method uses the intelligent mobile phone for replacing customized hardware as a network node. A microphone and a loudspeaker of the mobile phone are controlled in a pure software manner; linear frequency modulation (LFM) acoustical signals of 2k-6kHz are sequentially sent and are sampled at a fixed frequency (44.1kHz) at the same time; a sample waveform is detected in a generlized cross correlation manner, and synchronization of different mobile phone nodes is achieved using TPSN; and then each mobile phone node can sample an acoustical signal sent by a passive object acoustic source. The invention adopts the method of combining an improved statistical decision theory with voice activity detection (VAD), estimates an arrival time of the object acoustical signal to obtain time difference of arrival (TDOA), and finally achieves position estimation of the object acoustical signal. The method does not require a customized hardware module, prevents delay nondeterminacy of time from inter-node wireless synchronization to acoustical signal collection, and can precisely estimate the arrival time of the acoustical signal using the sampling point number. The precision is high, the cost is low, the networking is convenient, and the prospect is wide.
Description
technical field [0001] The invention relates to a sound source localization method, in particular to a smart phone-based passive sound source localization method. Background technique [0002] Passive target positioning technology can realize precise positioning according to the characteristics of non-cooperative detected targets. Different from active or cooperative target positioning, passive target positioning technology is more widely used in the fields of military, mobile communication and radio monitoring, and its significance is more significant, such as gunshot positioning, mobile robot positioning and intelligent conferences. Compared with wireless signals and ultrasonic waves, the positioning technology based on the measurement of acoustic signal propagation time has the advantages of low frequency, low speed, low energy consumption, and easy synchronization, and the acoustic features are obviously difficult to eliminate, and it is easier to meet the high-precision...
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IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 王智方文浩文祥计张磊
Owner ZHEJIANG UNIV