Sound And Image Acquisition Device For Safety Precaution

In recent years,with the vigorous development of the global economy,the outbreak of global terrorist attacks and accidents has increased.The focus of global attention has been tending to safeguard world peace and protect public security.In the past,it was inclined to take measures to monitor the objects after the event.Now,with the development of the situation,precautionary measures are unavoidable.Therefore,the identification and analysis of monitoring objects with the help of professional and technical means arises at the historic moment.At present,the global security field has made great efforts to advance the security sound image monitoring device.This measure has also been gradually developed into the governments around the world,enterprises and even personal family security system.At present,there are few researches on the estimation of the azimuth of sound source signal and efficient video data acquisition.Its modular application in the sound and image acquisition device is even more scarce.Therefore,research and implementation of the design of sound and image acquisition device for safety precaution has important practical significance for promoting public safety and ensuring people's travel.Based on the in-depth study of the double ear effect and auditory masking phenomenon,the design and implementation of foreign products of the same kind are fully investigated and analyzed,the design scheme of achieving sound signal acquisition and camera rotation based on acoustic source azimuth is proposed.Sound and image acquisition device for safety precaution is divided into several main modules:sound signal acquisition,sound signal processing and camera positioning sound source.Among them,each function module takes the MCU as the control core,completes the docking work and realizes the target function of the complete device,that is,to receive the information parameters of the sound source,and to control the rotation direction,rotation angle and rotation rate of the camera.According to the function analysis of the whole system,the function of the complete device is designed and realized.The sound absorption wallpaper with sound insulation is used as the material to make sound source isolation device,and the sound insulation device that absorbs the target sound source and the external reflection interference sound source is set up.In order to realize the voltage signal corresponding to the sound wave as the basis of the amplitude and change of the response sound.a sound signal acquisition circuit based on the electret condenser microphone is proposed.In order to achieve the purpose of comparing the sound amplitude,the collected sound signals are processed by the amplifying circuit,the plastic circuit and the A/D conversion circuit,and the digital parameters are received by the single chip computer and stored.In order to realize the camera to locate the sound source and collect the video data efficiently and intelligently,the single chip computer is used as the control core to realize the connection and control of the functional modules of each part.Each part of the hardware design module is set up,including stepping motor drive,sound signal transmission,digital display,keystroke input,delay and USB power supply,etc.By means of modular software design,the corresponding subroutine module is invoked and the stepper motor is driven into the corresponding working state by presupposition to judge whether the requirements of the related conditions are satisfied.Finally,the function test of sound signal acquisition and camera localization is carried out in laboratory environment.According to the basic principle of the curve fitting function of R language,the parameters of sound source signal are fitted by RGui function,and the contrast curve between the calculation angle and the real test angle obtained by the fitting function is analyzed and drawn.According to the correlation between the sound signal parameters and the test angle,the rotation direction,rotation angle,rotation rate and start stop of the camera based on single chip microcomputer control are tested.The test results show that all the functional requirements of the system meet the design needs,and verify the feasibility and completeness of the design plan.