Nowadays people have more and more sudden accidents in their daily lives, and people’s awareness of “acceptable evidence” has become stronger. Video surveillance has become one of the most important sources of people’s evidence collection. As a result, people are increasingly monitoring audio. The more you pay attention. In the field of security video surveillance, the addition of audio monitoring makes monitoring no longer just a "silent movie." In recent years, the introduction of some related national policies requires that some monitoring sites must synchronize video and audio, which also brings a certain market for audio monitoring. The goal has also begun to rise from “visible” to “clear” and “listening”. See you."
Audio monitoring applause and how to install the core component pickup?
Nowadays people have more and more sudden accidents in their daily lives, and people’s awareness of “acceptable evidence” has become stronger. Video surveillance has become one of the most important sources of people’s evidence collection. As a result, people are increasingly monitoring audio. The more you pay attention. In the field of security video surveillance, the addition of audio monitoring makes monitoring no longer just a "silent movie." In recent years, the introduction of some related national policies requires that some monitoring sites must synchronize video and audio, which also brings a certain market for audio monitoring. The goal has also begun to rise from “visible” to “clear” and “listening”. See you."
At present, audio monitoring has been widely used in public facilities. A complete set of audio monitoring system includes a sound collection part, a speech noise reduction part, a network recording part, a voice intercom part, and a sound intelligence analysis part. Through the scene analysis of audio monitoring to determine abnormal behavior in public scenes, this technique is based on the characteristics of various types of abnormal sounds in the time and frequency domains. In combination with pattern classification methods, abnormal events can be alarmed.
The pickup is the core of the audio monitoring system. 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. How to install the pickup?
First, the choice of pickup location
The pickups can be mounted on the ceiling or wall, and the installation location should be as close as possible to the main talking area. For example, the interrogation room may be installed near the person being tried; the classroom may be installed near the podium; and the small meeting room may be installed at the center of the ceiling. Principle: As close as possible to the main talking area, this sounding effect is better.
Second, picker connection cable selection and wiring
Pickup installation Considering the complex construction environment, a 0.5mm2 cross section 3-core signal cable is recommended, which is the commonly used 3x0.5RVVP cable. The power supply of the pickups generally adopts a remote centralized power supply mode (ie, centralized power supply at the audio recording device/amplifier device side), and the power cables, audio signal lines, and public ground lines are used in the 3-core cable. Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, the shielding net connected to one end of the pickup is suspended, and the shielding net connected to one end of the audio device is connected to the equipment ground (chassis). Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
Third, the pickup power supply
The power supply mode of the pickup requires remote centralized power supply (ie centralized power supply at the end of the audio recording device/amplifier device), whose main purpose is to have stronger anti-interference and noise capabilities. Because the pickup is a very sensitive small-signal amplification device, it is sensitive to the clutter of the power supply, and it is necessary to use a clean, high quality DC stabilized power supply with a small amount of clutter. A single pickup consumes about 10-30 milliamps of current, which means a nominally 1 amp DC regulated power supply can operate at least 10 pickups at the same time.
The power supply efficiency and line loss should be taken into consideration in the application. Try to use a power supply with a higher nominal value. The DC stabilized power supply referred to here is often referred to as a "transformer" and is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator. You cannot use a switching power supply. It may introduce a lot of circuit noise to the pickup.
Fourth, the common ground connection of the power supply cathode and audio ground of the pickup
The audio ground of the pickup and the cathode of the power supply are combined into one and must be connected to the negative pole of the DC stabilized power supply and the ground line of the audio input (LineIn) of the audio equipment. If the power ground and audio ground are not well connected, the sound quality will be degraded or there will be no sound. If the ground of the LineIn terminal of the audio equipment is not connected to the ground of the pickup, the sound will generally be very small.
V. Pickup audio cable connection
Acoustic audio signal cable and audio ground cable can be directly connected to the device: Acoustic headphones, active speakers, audio amplifier, audio and video distributor, DVR DVR, video server, mixer, recorder, sound card or other audio equipment LineIn linear input (microphone connection is strictly prohibited).
1, hard disk recorders. Most hard disk video recorders have corresponding audio input ports, which are generally coaxial cable BNC plugs. The pickup audio cable needs to be connected to the center pin position of the BNC plug, and the pickup must be connected to the BNC plug's enclosure (that is, the shielded copper mesh that connects the coaxial cable).
2, comes with power amplifier active speakers. A set of ordinary active speakers are generally left and right, corresponding to the left and right audio channels, respectively. This pickup only provides one sound source, so it is a "mono" sound source. The audio cable of the pickup is connected to the left/right audio cable of the speaker cable, and the pickup is connected to the ground of the speaker cable in common.
3, other audio equipment such as power amplifiers, mixing consoles and other methods of connection are the same.
4. It is forbidden to connect the pickups to the microphone (MIC) input terminals of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because the microphone inside contains a microphone, but it also includes amplification, noise reduction, echo processing and other circuits, output "LineOut" audio signal above 1Vpp.
5, notebook computers are rarely equipped with "LineIn" audio input jack, generally only equipped with MIC input jack and SPEAKER output jack. The pickup cannot be directly connected to the MIC port. Only a professional external USB interface desktop sound card can be purchased. Use the “LineIn” port to access it.
6, pickup audio cable can not be directly connected to the two audio devices, microphone adapter must be connected in order to avoid impedance mismatch may cause deterioration of sound quality.
Precautions: During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.

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