What is move the acoustic feedback frequency divider?

"Howl" nemesis — parameters move prescaler-------------specifically addressing conferences, teaching and stage sound "howl" issue. This device can greatly increase the gain of the microphone, the speaker will not be affected by the distance of the microphone. Indoor sound reinforcement system for measuring the quality of sound reinforcement system is the most important parameter is the gain volume, clarity, and frequency characteristics and impact of the three most important factors is the acoustic feedback (collectively referred to as Whistler). This is the trouble reproducing one of the main challenges of teacher. First, the howl of several types: 1. howl of largely as a result of the audio signal of a positive feedback. 2. resonance frequency by the room. Room resonance frequency is also called the standing wave, resonant frequency, also known as the how. How is a room in length, width and higher inherent physical characteristics. Standing wave of improvements usually by changing the architecture of the acoustic architecture to solve. 3. inside the feedback by the system. Peripheral equipment and mixer, with parallel connection between loop voltage gain up to a certain value, it is possible to produce this kind of Whistler. By cutting off the ring road, whistling won't have. 2. solve the screech of audio technology Super Forum from the above analysis produced Whistler's reasons can be seen, to eliminate whistling can only cut the feedback link. 1. the use of notch filter (parametric equalizer and feedback suppressor. Feedback sound suppressor of fundamental principle is an automatic tuning parameter Equalizer) reduce feedback frequency level gain so as to achieve the purpose of lifting the whistling. 2. the frequency of removal will move the prescaler 3. using call ECHO CANCELLER technology, doing delay's level adjustment system of feedback acoustic isolation, avoid whistling. In these three methods, the first one is currently using the most common solution is a notch filter. The second method uses shift solution, this approach is most effective, and can greatly improve the sound reinforcement gain. The third ECHO CANCELLER technology, there is currently no universal use. It is well known: 1. the parametric equalizer and acoustic feedback suppressor of adjustment is very complex, parametric equalizer to adjust without mature debugging experience and with the sound test instrument cases are very difficult to adjust accurately. Acoustic feedback suppressor of complex settings allow most engaged in professional audio peers also discouraged, as a large number of users use it more to talk about. 2. acoustic feedback suppressor/parametric equalizer even adjust normal, the system volume is less than 3db gain. This is some need to be substantially sound reinforcement occasions, seem powerless to gain. From the usability and ease of operation, with parameters and move the prescaler resolve Whistler, can achieve maximum system gain volume. This approach is worth promoting. Have a friend that parameter equalizer or feedback suppressor and move when the prescaler piece using two things are not cheap! and move prescaler sound quality (tone) destruction, in singing is not appropriate. Move the destruction of the prescaler sounds great! but the technology is too old! if technology high, only parametric equalizer can get ~ ~ indeed, notch technology, frequency-shift technology are not a new thing. I do the following two aspects: 1. equalizer, feedback suppressor in room natural frequency curve setting, its gain maximum can only improve 3db, using ordinary meeting microphone capacitance, speech distance in meet the relative sound pressure, the maximum distance does not exceed 0.6m. However, the parameters move prescaler can increase the gain of up to 6-10db, the ordinary Conference microphone capacitance can do 1-2.5m 5、effective of distance, you can use the interface microphone pickup distance to 2.5-5m valid. Only in the use of frequency shift, the speaker can really get rid of the microphone, truly worry-free sound reinforcement. 2. move the distortion modulus is an indisputable fact that, as regards distortion of the size and the right of use has a lot to do. Specific method is to shift the input and output signals are reasonable control to meet the environmental requirements as standard and cannot be used to meet the equipment played as debugging standards, otherwise there will be significant distortion. If you are the Conference sound reinforcement, shift amount set to minimum, into, out of the use of gain to meet the requirements of sound pressure on it, in this case, the distortion almost did not recognize, this can be done by field tests to verify. If not for the stage, with its direct into the system, can be assisted intervention, with its only control the human voice, control volume size can be adjusted by reference to the meeting so vocal distortion is also very small, the gain can be significantly improved. Furthermore, the electric sound reinforcement of itself is a manufacturing process for distortion. Effects, such as most of the actuator are peripheral equipment for manufacturing of distortion, but one purpose is to achieve better results. Of course there's equipment is designed to meet the auditory effect, some equipment to meet the system requirements for using effects. Move prescaler efficacy to achieve is the microphone and the system of transmission of gain maximum, distortion is normal, as long as a reasonable range of use is acceptable.