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Audio monitoring is an important part of security system, it is a strong ability to prevent the comprehensive system, intuitive, accurate, timely and informative content to highlight its characteristics.
For the integration of audio and video monitoring camera, eyes, ears. Eye to see the image and ears to hear the sound through the cable, optical fiber, network and other neural systems to be transmitted to the brain as a hard disk recorder to save the composition of a basic audio and video recording system. However, in the early monitoring system, it is difficult to see the shadow of the audio monitoring, the traditional monitoring system is not sound, just like the silent film in the early years, people can only see the silent image. Audio monitoring has not been promoted.
First, due to the privacy issues that may relate to the individual, the early application of audio monitoring is very small. Some of the sensitive things people are afraid to talk about in private, if the "careless" was recorded, the monitoring data failed to be properly kept and caused a privacy leak.
Secondly, it is difficult to deal with the noise of audio monitoring. From the physical principles of sound transmission in the air we learned that: the average person talking sound intensity in the majority of 50 dB, the spread of the distance in the 30 meters. The noise of a busy highway is basically at 60 dB, the voice is very easy to be drowned. Mixed with a variety of complex environment noise, voice processing is very difficult. As the public security supervision system (police, immigration, security, letters, Che Kwun Hall), these local features are very large, empty and noisy, requiring monitor microphone of high sensitivity, wide range, strong anti noise performance; the outdoor environment is mainly wind noise road noise interference, monitor microphone the sound of the dust proof ability strong; indoor environment is relatively smaller, the echo is large, we must take the anti echo technology; and quiet environment, is required to hear the slightest sound, such as the public security supervision of the interrogation and gun room, the slight sound can be collected in the first time, monitor microphone sensitivity must be very high requirements, and to achieve the original sound effect.