How to suppress the occurrence of echo howling?
In the past, when we used the sound reinforcement system, especially the indoor use of the pickup (commonly known as the microphone), the sound reinforcement often produced howling. The reason was that the room inherently had an echo phenomenon. When the echo generated by the speaker returned, the microphone was passed, and it was picked up by the microphone again. to sound, the echo re-enter the public address system was enlarged, and if the initial echo sound is the same as phase two will produce sound superimposed strengthen, strengthen the voice echo again to the microphone amplification strengthen again, again and again, we had a strong The harsh whistling, which destroyed the stability of the sound reinforcement system, the effective sound could not be expanded and could not be heard, and the whole equipment could not work normally. Therefore, the root cause of howling is echo (caused by echo feedback acceleration).
Way to suppress the echo howling way in the audio industry, the first to solve the echo howling sound system is to reduce the gain (amplification amount) to make the system stable work, the disadvantage is not fully meet the requirements of sound volume. Next, engineers and technicians worked hard on indoor architectural acoustics, structural acoustics, and interior decoration to solve the problem of sound reinforcement.
The question and echo feedback whistling, the most typical of this aspect is the Chinese Concert Hall in Beijing, which basically can not use the current sound reinforcement equipment, but its cost and construction is very difficult, and does not have universal promotion significance. Therefore, engineers and technicians and by carefully study the formation mechanism of the whistle and think of ways to solve this circuit in the sound problems, he has developed a balanced, frequency shift, phase shift, parametric equalization and other programs, can basically meet the modern PA Requirements have a general promotion significance. At present, there are mainly the following howling suppression techniques (there is no technical analysis here):
1. Balance mode suppresses howling 2, frequency shift mode suppresses howling 3, phase shift mode suppresses howling 4, parameter equalization mode suppresses howling 5, DSP technology is applied
Http://
The main circuit of the equipment is the full bridge controlled circuit and the trigger circuit is the programmable integrated circuit. The phase-shifting, fixed width and modulation of the pulse are all digitized, and it does not need any adjustment for the section of the trigger. It has the features of high reliability, high pulse symmetry, strong anti-interference ability, quick reaction, as well as the advantages of no heat-generating, constant current, energy-saving which is compared with the discharge with the electrical resistance.
Battery Maintenance Charger,Battery Maintenance Equipment,Charging And Discharging Equipment,Battery Charge Discharge Machine
Xinxiang Taihang Jiaxin Electric Tech Co., Ltd , https://www.chargers.be