A hundred-year plan is education-oriented; an education plan is teacher-oriented. Teachers are engineers of human souls and noble professions of mankind. At the same time, it is also an indisputable fact that teachers have become one of the top ten diseases with a high incidence of chronic pharyngitis. According to an authoritative survey, the incidence of chronic pharyngitis among teachers across the country is as high as 87.3% Highly valued. Development course of teaching sound reinforcement equipment Disadvantages: Fixing the teacher on the podium (such as using a fixed microphone) or moving around the podium in a small area (wired handheld microphone), body language Words are difficult to implement and cannot be written on, which is inconvenient to use. Second generation: frequency shifting amplifier Advantages: The teacher can move a large range on the podium without wearing a microphone. It is easier to use body language and convenient to use. Disadvantages: The sound is severely distorted, and the sound of the room is amplified at the same time as the sound is amplified, which is increasingly less accepted by the school Third generation: FM wireless amplifier Advantages: Greatly improve the sound quality, the teacher can move around the classroom, can fully display body language and blackboard writing Disadvantages: the versatility of the transmitter is not good, one transmitter can only be used in one classroom, the school needs to be set up by a special person to manage, each transmitter must be numbered, the same transmitter is used by multiple people, there is no way to meet the health requirements of teachers Secondly, the quantity used in the same school cannot be too large, otherwise it will interfere with each other, that is, it is easy to cross-frequency; In addition, the electromagnetic wave radiation has more or less adverse effects on the health of teachers and students, and it is also our government ’s efforts to improve One of the goals. Advantages: The transmitter is extremely versatile. A transmitter can be used in any classroom. This creates a condition for the school ’s teachers to meet the teachers ’requirements for hygiene, and does not require the school to send someone to manage it. At the same time, The sound is beautiful and clear without distortion. It is used in an unlimited number of clusters and never cross-frequency. The teacher will not affect the amplification effect when walking in the entire classroom. At the same time, it can fully display body language and blackboard writing, and make the lecture lively and lively. The best results. The system uses infrared to transmit audio signals, so there is no harmful radiation to the teachers and students. In summary: the progress of science and technology has achieved the development of mankind. On the basis of fully integrating the advantages and disadvantages of the previous three generations of products, the infrared wireless sound reinforcement system was born at the end of 2007. It is perfect for teaching sound reinforcement. In the near future, the infrared wireless sound reinforcement system will become the mainstream of all kinds of campus sound reinforcement in the country and even the world, and will allow more and more teachers to enjoy the results of scientific and technological progress. Toner Bottle,Glass Cosmetic Bottle,Cosmetic Water Bottle,Vacuum Cosmetic Water Bottle Zhejiang Changxing Hanghua Glass Co., Ltd. , https://www.hanghua-glass.com
There is a proverb about pharyngitis in the folks, "It is difficult to make a quick decision when life and death are determined." This means that acute laryngeal disease can decide life and death overnight. Chronic laryngeal disease requires its recovery, and multiple doses of medication are still difficult to grasp. This shows to a certain extent that chronic pharyngitis is very easy to repeat, treatment is particularly difficult, and treatment can only relieve Symptoms, there is no good solution to the root cause. The development of chronic pharyngitis in the later stage is also likely to cause chronic vocal cord inflammation, vocal cord nodules, vocal cord polyps, and even loss of voice. Therefore, to fundamentally solve the teacher ’s chronic pharyngitis and save or extend the teacher ’s career, Must be based on prevention.
Although there are many causes of chronic pharyngitis, one of the most important occupational factors is excessive voice and long-term speaking. The fact that the teacher needs to speak for a long time is unchangeable, so experts suggest that the teacher should change the traditional Lecture habit (Lecture with a loud voice), as much as possible with the aid of sound reinforcement equipment, lectures at normal volume can effectively protect the throat and avoid the occurrence of chronic pharyngitis. In fact, in the United States, Japan and Japan where teaching sound reinforcement equipment is more popular In Hong Kong, Macao and Taiwan, where the teachers ’chronic pharyngitis has been controlled at less than 20%, it is not much different from the incidence of other occupations.
To this end, the majority of scientific and technological workers have done a lot of work in the research and development and design of sound reinforcement equipment, overcome one after another scientific and technological problems, and introduced generation after generation of sound reinforcement equipment for teachers to use, designed to let our teachers use Convenient, customary, hygienic, and healthy.
The first generation: wired teaching system
Advantages: Realize the basic function of sound reinforcement
The fourth generation: infrared wireless sound reinforcement system
Development history of infrared amplification