Camera guiding device and method based on microphone array

Abstract

The invention relates to a camera guiding device and method based on a microphone array. The guiding device comprises a camera, the microphone array and a multichannel sound signal synchronous collection processing system, wherein the camera is provided with a control pan-tilt. The multichannel sound signal synchronous collection processing system comprises a conditioning circuit, a Codec chip, a DSP chip and a 485 interface. The conditioning circuit is used for conditioning analog signals collected by microphones. The Codec chip is used for converting the analog signals into digital signals and sending the digital signals into a DSP chip. The DSP chip is used for conducting sudden sound signal detection and sudden sound signal direction sensing and transmitting a direction sensing result to the control pan-tilt of the camera through the 485 interface according to the received digital signals, and therefore the angle of the camera is adjusted so that the camera can aim at a target to conduct shooting. The guiding device has self-adaption performance, and is wide in application range and capable of preventing the camera from rotating in an aimless mode, and meanwhile the estimation precision of the direction and the robustness of a system are high.

Description

technical field [0001] The invention belongs to the technical field of monitoring, and relates to a device and method for detecting and direction-finding a sudden sound source by using a microphone array, and guiding a camera to capture the sudden sound source. Background technique [0002] At present, video surveillance is an important means in the field of surveillance and has been widely used. However, the camera has a blind spot. Generally, the viewing angle of the camera is 52°, and the monitoring range is limited. The rotatable camera is usually rotated regularly or manually controlled. It is difficult to capture emergencies in time, such as riots in public places, residential areas, etc. Vehicle theft alarm, traffic accident, etc. If these events are not in the monitoring area of ​​the camera, traditional video surveillance systems are powerless. [0003] As we all know, people can locate the sound of emergencies through their ears, and then adjust the viewing angle...

AI Technical Summary

Problems solved by technology

[0005] However, the common disadvantages of the above patents are: 1. There is no sound detection module. If the sound detection module is not added, the camera cannot be targeted at emergencies, and the whole system is easily disturbed by external noise; 2. In the above patents, TDOA-type sound source localization methods are used. This type of method requires a large distance between the microphones, so the whole device is bulky and difficult to be practical in practice; and this type of direction-finding algorithm belongs to the time-domain processing method, and different scenarios. The frequency range of the sound signal is different, and this method does not select the sound frequency

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