Tripod head camera for automatically tracking sound source

Abstract

The present invention relates to a horizontal stage video camera for automatically tracking voice source, whose voice detection circuit is composed of a voice acquisition unit, a dual-channel preamp circuit, a voice signal conversion circuit, a dual-channel integral circuit, an A / D converting circuit, a triggering circuit and a PTZ controller. The virtual distance between voice signals after expansion of the strength difference is several times or furthermore larger than the physics distance when they are acquired by the voice acquisition unit, the invention takes a simple method to eliminatethe disturbance of reflection voice to the main voice source, greatly facilitates the processing of subsequent data and improves the sensitivity of the complete appliance; the invention has low cost,smaller volume, suitability fro the industrial production and specific adaptation to abnormal voice source or places automatically responding to the specific voice.

Description

technical field [0001] The invention relates to a video monitoring system, in particular to a pan-tilt camera that automatically tracks sound sources. Background technique [0002] People can distinguish the position of sound because people have two symmetrically distributed hearing organs-two ears. When a sound appears, there are some differences in the intensity, time and phase of the sound waves reaching the two ears, and these differential information can help people identify the direction of the sound. However, since the physical distance between the two ears of a person is too small, the above-mentioned intensity difference, time difference and phase difference are not obvious. [0003] The PTZ camera is an important image acquisition device in the security and fire video monitoring system. It can be rotated under the control of the monitoring center or under the control of the program, so as to achieve the purpose of monitoring the target within a certain range. The...

AI Technical Summary

Problems solved by technology

However, in many cases, it cannot meet the special monitoring needs of some users. For example, in a hall or square where no one is on duty at night, the PTZ camera can only monitor one or several targets statically or semi-statically. Respond to random abnormalities, such as unusual noises

[0004] Therefore, simply installing two sound sensors similar to the human ear structure on the PTZ camera and processing the sound signal through a simple processing program is difficult to realize the automatic tracking function of the PTZ camera following abnormal sounds

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