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Experience: Pickups Choose to Install and Use Common Problems (1)
The author has been engaged in the design, manufacture and sales promotion of security monitoring pickups for several years in Qingdao Spectrum Electroacoustic Technology Co., Ltd., and has contacted many companies' products, and also contacted a lot of engineering clients. They have accumulated some experience in the selection and installation of pickups. , To some common pickup application problems, do some summary for everyone, hoping to benefit the work of friends. The following list starts with the problem of excluding the pickup itself.
1. Why does the pickup I connect to have no normal sound? I hear a complete beep.
Note: There is power, there is a voice, but only a beep and no vocals.
Sorry, this is where you reversed the wiring of the audio input and audio input.
I didn't pick it up right. I didn't know how to do it. Yes, I was right. The answer was to pick it up. Check again, the cable audio cable. This is a common mistake.
2. Why is the sound of the pickups I picked up so poor that the beep sounds overshadow people's voices?
Note: There is a beep, there is also a voice, just a beep almost overshadowed the voice.
In this case, it is generally understood that the pickup is selected poorly. It is recommended to buy a better pickup, which is a matter of price and goods. In fact, this situation is mostly caused by the interface mismatch. For the majority of pickup manufacturers to say a fair word, and then poor pickup products, it picked up the sound, it will not be overshadowed by noise. With this belief, if we can't hear the poor sound of poor sound quality, we still have to check the reasons I mentioned later. In other words, the obvious sound quality problem is the installation wiring problem.
At present, the audio input interface of the camera or DVR has two situations: line in interface (linear input interface) and Mic in interface (microphone interface). The pickup is a microphone with an op amp function, which is connected to the line in interface, and the general microphone is connected to the Min in interface. If the pickup is connected to the MIN IN connector, the sound heard at the center will be very noisy and overshadowed.
The solution is to confirm that the LINE IN connector is connected. In the video settings of Dahua network cameras, Haikang network cameras and other mainstream camera manufacturers, there is an audio setting to search for audio input modes. Some defaults are line in interfaces, and some provide line in and Mic in switching. Only provide MIC in interface, a few years ago, there are some models of Hai Kang network cameras only provide MIC IN interface, access to conventional pickups on the poor sound quality, security engineering business customers cause great trouble, so the market also appeared the so-called "Passive pickups", this is afterwards, for this reason, their late products provide dual interface switching methods, and later, simply provide the line in method, because only need to access the microphone pickup)
3. Why are the pickups not bad? The sounds heard are still very loud, the vocals are insufficient, and the interface type is correct.
There is a possible reason for this. The selected audio cable is a three-wire connector, such as a 3.5-channel audio connector. The installer may easily connect the left and right audio channels of the audio cable to the audio ground cable. For example, if one of the audio lines (left or right) is used as the ground wire, and the real ground wire and another audio cable are combined together as audio input lines, this may cause sound quality. Worse.
We still need to familiarize ourselves with the common 3.5 audio header structure and its meaning. There are generally 2 sections of 3 sections and 4 sections. The general section is 3 sections. The head is the left channel, followed by the right channel, and then the ground is GND. The 4 sections are generally used for mobile phone headsets. With microphone line. The security field can be ignored.
Frequent mistakes are reversed or misconnected terminals because the three wires in the 3.5 audio cable on the market have all kinds of colors. Without multimeter testing, it is difficult to judge with naked eyes the ground wire. Left channel right channel.
In order to facilitate the convenience of the wiring for the builders of the project, the spectrum pickups provide various wirings for the pickups. One is a direct connection on the pickups, and the other is a custom-made 2-core 3.5 audio cable, which connects the left and right channels. To the white line, the ground wire is black, so that the customer's hand only has two wires, white and black, which are very easy to distinguish.
Do not underestimate this little connection, choose a good one, save time and effort, choose a bad connection, time-consuming, can not find the reasons, toss back and forth, installation and construction costs are high. Customers can purchase and visit our company (Special Power Electronics) Alibaba Shop or the company's website to purchase directly.
to be continued