The core component of audio monitoring is the pickup. For the integrated monitoring of audio and video, the camera is the eye and the pickup is the ear. The images seen by the eyes and the sounds heard by the ears are transmitted through the nervous system such as cables, optical fibers, networks, etc., to the hard disk recorders as brains to form a basic video recording system. Most of the traditional monitoring systems have no sound. Just like the silent movies of the early years, people can only see silent images. Many monitoring systems now require integrated audio.
First, the microphone in the audio security monitoring of the three major technical problems 1, the long-term development of audio monitoring technology is slow, noise processing is difficult to vocal and noise after amplification is very easy to confuse together, even if it is installed on the pickup is heard noise, Audio monitoring did not achieve its purpose and significance. Pickup noise reduction needs to solve two problems, one is to reduce the noise from the circuit itself, and the other is to reduce the interference from environmental noise. The noise of the circuit itself is relatively easy to solve, and the environmental noise problem is more complicated and difficult to solve. Low-level environmental noise can be automatically monitored by noise and feedback suppression. This technology can suppress some of the ambient noise. However, in strong noise environments such as highways, DSP noise suppression must be used to achieve higher requirements. At present, advanced speech noise reduction algorithms can only reduce noise by about 20dB in the case of ensuring less distortion.
2. Long-distance audio monitoring is difficult. The physical principle of sound propagation in the air. We know that most people's speaking voice strength is mostly 50 decibels, and the spread distance is about 30 meters. Noise on busy roads is basically at 60 decibels, and the sound of speech can easily be “overwhelmedâ€. This is why everyone is getting louder and louder in a noisy environment so that the other party can hear it. However, the sound energy of a person's voice spread to 100 meters away has already tended to be zero. No matter how magnified, it is useless. With the mixing of environmental noises, the processing of speech becomes more difficult. The laser pickup can solve the problem of hearing long-distance sound, but the cost is very high, the sound quality is poor, and the directionality is strong. It cannot be widely promoted in the audio monitoring field and can only be used in the criminal investigation field.
3, good pickup price high microphone microphone head as a key component of the pickup, its performance directly affects the quality of the sound. Poor mics cost a few cents, and good mics cost tens of thousands. In order to obtain better sound quality, you must use a high-grade microphone head, and its cost accounts for more than half of the total cost of the pickup. Coupled with the high cost of DSP chips for back-end noise processing, the price of high-end pickups has remained high. This is why karaoke microphones are a few hundred dollars, and why CCTV announcers use tens of thousands of microphones.
Second, the development trend of pickup technology With the rapid development of pickup technology, the above technical problems will be able to solve, and government agencies and enterprises to improve security monitoring requirements, pickups will attract people's attention, the pickup will lead the security monitoring From the visible change of position can be seen clearly.
Third, Sizheng pickups Guangzhou Sizheng Electronic Technology Co., Ltd. is a professional service in the security monitoring of audio and video companies, the main R & D and production of audio equipment, pickups and provide system integration solutions, currently operating products include: monitoring pickups, omnidirectional Microphones, voice intercom systems, network video conferences, etc.; products and solutions provided by Sizheng Technology have been widely applied to all walks of life: airports, financial systems, prisons, transportation, highways, electricity, education, national defense, government public prosecution, Harbor, school digital examination room, customs, intelligent community, factories and mines, hospital network expert consultation and teaching system and other hundreds of thousands of places, successfully completed numerous exemplary projects throughout the country, and established a good image among customers. !
First, the microphone in the audio security monitoring of the three major technical problems 1, the long-term development of audio monitoring technology is slow, noise processing is difficult to vocal and noise after amplification is very easy to confuse together, even if it is installed on the pickup is heard noise, Audio monitoring did not achieve its purpose and significance. Pickup noise reduction needs to solve two problems, one is to reduce the noise from the circuit itself, and the other is to reduce the interference from environmental noise. The noise of the circuit itself is relatively easy to solve, and the environmental noise problem is more complicated and difficult to solve. Low-level environmental noise can be automatically monitored by noise and feedback suppression. This technology can suppress some of the ambient noise. However, in strong noise environments such as highways, DSP noise suppression must be used to achieve higher requirements. At present, advanced speech noise reduction algorithms can only reduce noise by about 20dB in the case of ensuring less distortion.
2. Long-distance audio monitoring is difficult. The physical principle of sound propagation in the air. We know that most people's speaking voice strength is mostly 50 decibels, and the spread distance is about 30 meters. Noise on busy roads is basically at 60 decibels, and the sound of speech can easily be “overwhelmedâ€. This is why everyone is getting louder and louder in a noisy environment so that the other party can hear it. However, the sound energy of a person's voice spread to 100 meters away has already tended to be zero. No matter how magnified, it is useless. With the mixing of environmental noises, the processing of speech becomes more difficult. The laser pickup can solve the problem of hearing long-distance sound, but the cost is very high, the sound quality is poor, and the directionality is strong. It cannot be widely promoted in the audio monitoring field and can only be used in the criminal investigation field.
3, good pickup price high microphone microphone head as a key component of the pickup, its performance directly affects the quality of the sound. Poor mics cost a few cents, and good mics cost tens of thousands. In order to obtain better sound quality, you must use a high-grade microphone head, and its cost accounts for more than half of the total cost of the pickup. Coupled with the high cost of DSP chips for back-end noise processing, the price of high-end pickups has remained high. This is why karaoke microphones are a few hundred dollars, and why CCTV announcers use tens of thousands of microphones.
Second, the development trend of pickup technology With the rapid development of pickup technology, the above technical problems will be able to solve, and government agencies and enterprises to improve security monitoring requirements, pickups will attract people's attention, the pickup will lead the security monitoring From the visible change of position can be seen clearly.
Third, Sizheng pickups Guangzhou Sizheng Electronic Technology Co., Ltd. is a professional service in the security monitoring of audio and video companies, the main R & D and production of audio equipment, pickups and provide system integration solutions, currently operating products include: monitoring pickups, omnidirectional Microphones, voice intercom systems, network video conferences, etc.; products and solutions provided by Sizheng Technology have been widely applied to all walks of life: airports, financial systems, prisons, transportation, highways, electricity, education, national defense, government public prosecution, Harbor, school digital examination room, customs, intelligent community, factories and mines, hospital network expert consultation and teaching system and other hundreds of thousands of places, successfully completed numerous exemplary projects throughout the country, and established a good image among customers. !
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