So far, Sizheng has seen many users' reactions to product like cctv microphone testing. In the process of user product selection, they always use different manufacturers' pickups to test and compare. In these processes, how to test is very important.
Conference room mic supplier-Sizheng has encountered such users. When they test the pickups compared to the pickups of different manufacturers, some are indoors and some are outdoors. Some are closer to air conditioners or noise sources, some are farther... so the test results are positive. Not the same, and users use such results to judge the quality of the product, in fact, it is unfair to every manufacturer.
In the same environment, we must also consider that each pickup must be the same distance from the person, although not exactly the same distance, but at least the same. In addition, during the test, the sound effects of different distances should be tested. For example, the sound effect at a distance of 1 meter, 2 meters, 3 meters, 4 meters, etc., sound conditions at different distances. Of course, this process tester must be the same person, ensuring that the frequency of the sound is consistent...
We must also consider accessing the device while ensuring that the environment and distance are the same. Whether using IPC as a transmission or using a DVR as a storage, we try to use the same machine or the same model. like me. We have encountered some users using different IPCs as access devices. As a result, the effect of playback from storage does have some difference.
Although the same type of IPC may be used for different purposes, the network camera has multiple audio input modes. Different decoding modes will produce different sound effects. Some IPCs have built-in noise reduction capability, which can be reduced to some extent. The noise of the pickup (which also causes a part of the distortion), turning on different functions will also produce different sound effects. Therefore, during the test, the audio decoding mode or the audio function of the camera will also lead to different effects.
This part is the most easily overlooked part. Many users think that there is no problem in the power supply for the pickup. It is not known that the pickup has certain requirements for power supply. Because of the working mode of different power sources (switching power supply and linear power supply).Differently, the ripples (current interference) generated by them are different. Therefore, it is recommended that users use linear power supplies during testing. Although some pickups incorporate filters, the fact that the current is generated by the switching power supply is unavoidable. In addition, the amplification of the pickup will make these currents more obvious.so we recommend using a linear power supply. If conditions permit, it is recommended to use the same power supply (centralized power supply) for testing...
This is extremely important in comparing the noise reduction performance of different pickups. In order to make the pickup sound cleaner (quiet), some manufacturers will reduce the magnification of the pickup, which in some cases will make the pickup sound very quiet. But at the same time, it also brings another problem, that is, the reduction of the pickup distance or the distance from the pickup is relatively difficult. Because it is recommended to compare the noise reduction effects of different manufacturers' products. Different pickups. The magnification (the Zhengzheng pickup part of the product has an adjustment button) is adjusted consistently. Let the sound picked up by each pickup sound as big as it is, and then judge the noise reduction performance of different products.
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