What Is Statistical Noise?

Statistical noise level refers to the statistical physical quantity used to describe the change of noise at a point over time when there is a large fluctuation in the noise level at that point.

Statistical noise level

Right!

Statistical noise level refers to the statistical physical quantity used to describe the change of noise at a point over time when there is a large fluctuation in the noise level at that point.

Chinese name

Statistical noise level

Refers to

Statistical physical quantities of noise over time

From

Law of the People's Republic of China on the Prevention and Control of Noise Pollution

Residential area

No more than 50 decibels

What kind of voice is called

1. Strong noise can cause ear discomfort, such as tinnitus, ear pain, and hearing damage. It has been determined that noise exceeding 115 dB can also cause deafness. According to clinical medical statistics, if you live in a noisy environment above 80 decibels, you can cause deafness to reach 50%. Medical experts believe that family noise is one of the causes of deafness in children.

2. Reduce work efficiency. Studies have found that noise exceeding 85 decibels can make people feel upset, people can feel noisy, so they can't work attentively, and as a result, they can reduce work efficiency.

3 Damage to the cardiovascular system. Noise is a risk factor for cardiovascular disease. Noise can accelerate heart aging and increase the incidence of myocardial infarction. Medical experts have proved through human and animal experiments that long-term exposure to noise can increase the adrenal secretion in the body, thereby increasing blood pressure. People who live for a long time with an average of 70 dB of noise can increase the incidence of myocardial infarction by about 30%, especially Noise at night can increase the incidence. The survey found that the rate of myocardial infarction among residents living next to highways increased by about 30%. A survey of 1101 women textile workers showed that the incidence of hypertension was 7.2%. Among them, those with exposure to noise of 100 decibels had a incidence of hypertension of 15.2%.

4 Noise can also cause disorders such as nervous system dysfunction, mental disorders, endocrine disorders and even increased accident rates. A high-noise work environment can cause dizziness, headaches, insomnia, dreams, general weakness, memory loss, and fear, irritability, inferiority, and even insanity. In Japan, there have been cases of insanity and suicide because of being unable to withstand the noise of trains.

5. Interfering with rest and sleep. Rest and sleep are necessary for people to eliminate fatigue, restore energy and maintain health. But noise makes people restless, and it is difficult to rest and fall asleep. When a person is unable to fall asleep, they will have a tense attitude, shortness of breath, increased pulse beats, more excited brains, and tiredness or weakness in their limbs the next day. As a result, it affects work and study. Over time, you will get neurasthenia, which manifests as insomnia, tinnitus, and fatigue.

6. Damage to female physiological functions. Women are threatened by noise, and they can also have irregular menstruation, abortion and premature delivery, such as causing female sexual dysfunction, menstrual disorders, and increased abortion rates. Experts have conducted a three-year systematic survey in 7 regions including Harbin, Beijing and Changchun, and found that noise can not only make women workers suffer from noise deafness, but also have adverse effects on women's menstruation and fertility. In addition, it can cause miscarriages, premature births, and even terats. Foreign countries have investigated the prevalence of miscarriages and premature births of pregnant women in a certain area, and found that they lived around an airfield, and the culprit was the huge noise generated by the flying plane.

7. Noise is more harmful to children's physical and mental health. Because the child is not yet mature, all tissues and organs are very delicate and fragile. No matter the fetus in the body or the child just born, noise can damage the hearing organs and cause hearing loss or loss. According to statistics, there are more than 70 million deaf people in the world today, a considerable part of which is caused by noise. Expert studies have proven that indoor noise in homes is the main cause of deafness in children. If you live in noise above 85 decibels, deafness can reach 5%.

8. Damage to vision caused by noise. People only know that noise affects hearing. In fact, noise also affects vision. Tests show that when the noise intensity reaches 90 decibels, the sensitivity of human visual cells decreases, and the response time for weak light recognition is prolonged; when the noise reaches 95 decibels, 40% of the people have dilated pupils and blurred vision; and when the noise reaches 115 decibels Most people's eyeballs have reduced their adaptation to light to varying degrees. Therefore, people who have been in a noisy environment for a long time are prone to eye damage such as eye fatigue, eye pain, dazzling and tears. At the same time, noise can cause abnormal color vision and vision. The survey found that noise reduced the visual field of red, blue, and white by 80%. Therefore, the driver should avoid the noise interference of the stereo sound, otherwise it may easily cause a driving accident.

1. Traffic noise. The increasingly developed urban transportation industry has brought convenience and comfort to people's work and life, and also promoted economic development. However, we can't help but see that with the increase of urban and rural vehicles and the increase of highways and railways, the noise of locomotives and motor vehicles has become the culprit of traffic noise, accounting for 75% of urban noise. According to statistics, Beijing is a world-renowned noise pollution city. Although urban vehicles are less than one tenth of Japan's, the noise level is twice as high as Japan's. In particular, some buildings facing the street have suffered severely.

2. Industrial machinery noise. This is also the main source of indoor noise pollution. Due to the impact, friction, spray, and vibration generated by various power machines and working machines, sounds of more than seventy to eighty tens can be produced. These sounds, such as the textile workshop, forging workshop, crushing workshop and steel plant, cement plant, air pump room, water pump room, are relatively serious. Although they have been treated to a certain extent, they still cannot completely eliminate the machine body. Noise generated.

3 Urban building noise. Especially in recent years, the rapid development of urban construction, road construction, infrastructure construction, urban building development, renovation of old urban areas, and interior decoration of ordinary people's homes have caused urban construction noise. The noise at construction sites is generally above 90 decibels, the highest Reached 130 dB.

4 Noise in social life and public places. Such as commercial noise in public places, restaurants, buses, passenger trains, crowd gatherings, tweeters and so on. According to statistics, social life and public place noise account for 14.4% of urban noise.

5. Household appliances directly cause indoor noise pollution. With the development of people's modernization of life, the noise of household appliances in households is becoming more and more harmful to people. According to tests, the noise generated by televisions and recorders in households can reach 60 to 80 decibels, and washing machines have 42 to 70 decibels. The refrigerator is 34 to 50 decibels. In recent years, household karaoke machines have become widespread. Some people are indulging in their own enjoyment regardless of the happiness of others, which has increased the pollution intensity of noise.