Why is the noise downstairs heard so clearly?

There may be several reasons why the noise downstairs can be heard clearly:

1.Sound propagation: Sound is transmitted through the air or other mediums, and when noise is generated downstairs, sound waves travel through the air to the upper floors.

If the noise source downstairs is stronger or more frequent, the distance and effect of the sound wave may be better, so that the people upstairs can hear the noise clearly.

2.Conduction pathway: In addition to being transmitted through the air, noise can also be transmitted to other places through the structure of the building.

If the noise downstairs is caused by vibrations or vibrations (e.g. knocking, machinery, etc.), these vibrations may be transmitted to the upper floors through the structure of the building, enabling the people upstairs to hear the noise.

3.Poor sound insulation: The sound insulation design and materials of the building can also affect the transmission of noise.

If the building is poorly insulated, for example with insufficient or aging wall, floor or ceiling insulation, noise is more likely to spread to other areas. This can result in loud voices being heard upstairs.

4.Noise type and frequency: Different types and frequencies of noise exhibit different characteristics during propagation.

Some noises may be more likely to penetrate obstacles and spread to other areas. For example, high-frequency sounds, such as high-pitched sounds, tend to travel more easily, while low-frequency sounds, such as heavy machinery sounds, are more likely to be transmitted through the structure of a building.

To reduce the impact of downstairs noise on the upstairs, consider the following measures:

Enhance sound insulation design and materials to improve the sound insulation of buildings.

Install sound-absorbing materials such as carpets and upholstery to reduce the reflection and conduction of noise.

Adjust activities downstairs or use noise-reducing devices such as sound-isolating headphones, sound-insulated walls, etc.

Communicate with the residents downstairs to remind them of noise issues and work together to find solutions.

Please note that the specifics may vary depending on factors such as building structure, soundproofing design, and type of noise, so it's best to take a solution based on your situation.

<> reason: reinforced concrete structure.

Too thin, low-frequency noise (subwoofer) can cause it to radiate, which in turn vibrates. In accordance with the relevant regulations, high-rise buildings.

The thickness of its reinforced concrete should reach 250 mm, but our current walls are generally 180, the thinnest is 160 mm, and there are very few that can really reach 250 mm.

Because its structure is so thin, low-frequency noise (subwoofer) can cause it to radiate, and the radiation produces vibrations, so we can often hear downstairs at home.

There are also different mediums for sound wave transmission. When the people downstairs speak, the sound waves are mainly transmitted by the medium of air, and then the air in the building is penetrated through the window, and the loss on the way is small, so the sound heard is larger. The upstairs person is surrounded by a wall, and the sound is mainly absorbed by the wall, which is a medium, and although the sound is transmitted fastest in the solid (wall), the receiver must come into contact with the solid to hear.

When we live in a building, we notice that the noise coming from downstairs is so clear that even the sound of people talking can be heard.

The reason for this phenomenon is due to physical reasons.

Specifically, the two phenomena of "reflection" and "resonance" in physics cause the problem that the noise from downstairs is particularly clear when you live upstairs.

Specifically, the following factors are present.

1. Noise increase caused by sound reflection.

The structure of the building is in a state of mopping the ground from the ground.

As a result, the earth is a good source of reflection relative to the upstairs.

All kinds of noise from pedestrians, vehicles, and equipment on the ground will be reflected to the sky through the reflection of the earth, and then dare to reach the upper floor.

At this time, people upstairs will clearly hear the noise coming from downstairs.

2. The factor of resonance.

Resonance is a physical phenomenon. It is a state that strengthens after the waves are stacked.

Resonance is a very harmful problem for buildings. ......Care must be taken to prevent resonances when designing buildings.

Regarding the issue of noise, resonance also plays a role.

Specifically, it's the case where noises from downstairs are stacked on top of each other to create some kind of resonance-like effect (not exactly resonance in nature), and this effect adds up, causing the noise to get louder and louder, and finally to be heard very clearly.

That's why it's so clear to hear the noise from downstairs upstairs.

As long as the walls are strong and the walls don't have too much soundproofing (not a lot of elasticity), the sound from downstairs can easily reach upstairs and be clear.

1. The reason is that the noise is generally divergent to upload.

2. Sound propagates in different substances, and sound waves will gradually weaken. The reason why you can hear the noise upstairs is that most of the sound made by the upstairs when it hits the ground floor, the sound is transmitted directly to the downstairs through the floor, so it can be heard very clearly, but if the sound is not made from the ground, such as the sound of speaking to the downstairs, it will pass through the air upstairs and the indoor air downstairs The sound waves will gradually weaken.

3. In the same way, the sound from downstairs should be transmitted to the upstairs through the floor slab, and it will pass through the ears of the indoor air upstairs on the downstairs indoor air floor.

What should I do if the sound downstairs disturbs the people.

1. If residents feel disturbed by noise pollution in the community, they can first report to the property management company and let the property company come forward to coordinate and solve it, because the "Regulations" clearly stipulate that "the property management enterprise shall stop the environmental noise pollution in the management area and report to the supervision and management department of environmental noise pollution prevention and control in a timely manner." "If the property management company fails to communicate and coordinate, the owner can call 12369 to complain to the environmental protection department.

2. In the "Regulations on the Prevention and Control of Environmental Noise Pollution", which was implemented in 2007, there are clear provisions on noise pollution in residential areas. "Article 38: From 6 p.m. to 8 p.m. the next day, no interior decoration activities that may produce noise shall be carried out in residential buildings that have been completed and put into use.

If the interior decoration operation is carried out at other times, noise control measures shall be taken to avoid environmental noise pollution to the surroundings. "Contact the local city administration or 110 to negotiate a solution.

The main description of the above content is how to transmit the sound downstairs to the upstairs? The specific introduction of what to do about the sound disturbance downstairs, the transmission of sound is very strong, so if you want to have some operations on the sound, it is far more troublesome than everyone thinks, but if you understand some sound insulation skills, you can indeed deal with some situations well, so that even if it is a very troublesome problem, you can easily solve it.

It may be that the building construction materials are not up to standard, and the building materials that do not meet the requirements will cause echoes, and the state has regulations on the building materials.

The level of noise and the height of the floor.

Tests by professional institutions show that the peak noise of high-rise buildings in the city is about 10 floors. According to the monitoring data, generally speaking, if there is a road around the building, the decibel level will increase every 3 floors, and the noise is the loudest about 10 floors of the building. In other words, for a building with about 20 floors, the middle floor is the most noisy.

The level of noise and the distance to the road.

When buying a house, in addition to considering the noise difference of the floor, you should also consider the surrounding environmental conditions of the house, such as whether there are highways and overpasses around, whether there are noisy factories, whether the house is facing the street, whether it is the main street or branches, etc. The closer you are to the source of the noise, the more you will be disturbed by the noise.

The level of noise and the distance to the road.

When buying a house, in addition to considering the noise difference of the floor, you should also consider the surrounding environmental conditions of the house, such as whether there are highways and overpasses around, whether there are noisy factories, whether the house is facing the street, whether it is the main street or branches, etc. The closer you are to the source of the noise, the more you will be disturbed by the noise.

The amount of noise and whether there are noise protection measures.

At the same time, the fence of the community, the building wall, the glass, the green belt, the soundproof screen, the soundproof window, etc., can also play a role in reducing noise.

The reason for this is that the noise is generally divergent towards uploading. According to statistics, the underground noise has little impact on the five to twenty-five floors of high-rise buildings because of its divergence upward, and the underground noise has little impact on the five to twenty-five floors of high-rise buildings.

Under normal circumstances, since the sound travels upwards, what is said downstairs is easy to be heard by the people upstairs, and when the people upstairs speak, the people downstairs cannot hear clearly, and may even not be heard. In addition, when we go to see the house, the room will be due to the principle of resonance, even downstairs, far away from the sound source, we can hear the noise upstairs.

At the same time, the sound is circuitous, and the noise from downstairs can be transmitted upstairs through gaps such as windows. We shout in front of the building, and the people in the back of the building can also hear the shouting, which is the roundabout nature of the voice. The sturdy solid floor slab conducts sound, so the noise from downstairs can be transmitted upstairs.

If you live in a building, you can only hear the noise upstairs, but you can't hear the downstairs. The reasons are: the residential floor height of the building is relatively low, the ceiling will not be suspended, the ground will only be paved with floor tiles or floors, and the materials for sound insulation and shock absorption will not be laid, and there are also various plate pipes; Of course, there may also be differences in the individual's more sensitivity to sound, generally upstairs and downstairs can hear sound, but downstairs is not obvious compared to upstairs.

For the noise in the building, there are generally two obvious sounds**, one is the upstairs and downstairs talking and noisy sounds, because the walls are thin and easy to be penetrated by this noise. The other is "structure-borne noise", also known as "solid sound", that is, the impact of slippers, tables and chairs on the ground in the house will cause the floor slab to vibrate, and spread to other residents through the walls and pillars connected to the real estate.

In the past, the old houses generally used brick and concrete structures, and the walls were used as load-bearing walls, and the thickness was mostly more than 30 cm; Today, almost all of the new buildings are steel-concrete structures, supported by beams and columns, and the walls are just infill walls that divide the interior and are 20-24 cm thick to save interior space. Therefore, noise can often be heard in the building, and the sound insulation effect is poor.

Sound travels through the air, and when the temperature is too high, the air floats, so you can hear what is being spoken downstairs, and people downstairs can't hear it clearly.

In most cases, only a large decibel sound can be distinguished by the human ear in an open environment, and the human ear often collects echoes in daily life, but because the decibels of the echo are low or in a noisy environment.

Therefore, the human ear cannot distinguish echoes, so there can be no misunderstanding that "there is no echo in daily life", in fact, it is just that our ears cannot distinguish such sounds, or the brain receives but cannot distinguish them.

Sometimes, when we stand on the mountain and shout, we will hear our echo, because in the process of propagation, the sound encounters such an obstacle and will ** come back and be heard by us again. When two sounds reach our ears, and the time difference is less than a second, we can't tell the difference.

When the sound source stops vibrating, the sound continues for a period of time, a phenomenon called reverberation. Of course, if the sound is emitted in a space with obstacles and obstructions, there will be echoes, that is, as long as the sound encounters obstacles during the transmission process, the echo phenomenon will occur.

Upstairs, downstairs, mid-upstairs, it's easier to hear. The distance from the upstairs to the downstairs is the height of the sound source plus the height of the floor minus the height of the human ear. Because the height of the human ear is significantly greater than the height of the sound source, it is obvious that the distance from the downstairs to the upstairs is smaller than that from the upstairs to the downstairs.

What is the position of a large number of sounds in life, our noise in life is usually the first to be in people's mouths and hands, that is, at a height of 1 to 2 meters from the ground, after these sounds are emitted, they are transmitted to the ears of the listener through the window or floor, usually the height of the current building is about 3 meters, so the sound downstairs is transmitted to the distance from the upstairs is the height of the floor minus the height of the sound source plus the height of the human ear.

The principle of sound

Sound is a kind of pressure waveWhen playing a musical instrument, slapping a door or knocking on the tabletop, their vibration will cause the rhythmic vibration of the medium-air molecules, causing the surrounding air to produce dense changes, forming dense longitudinal waves, which will produce sound waves, and this phenomenon will continue until the vibration disappears.

As a kind of wave, frequency and amplitude have become important properties to describe the wave, the magnitude of the frequency corresponds to what we usually call pitch, and the amplitude affects the magnitude of the sound. Sound can be broken down into superpositions of sine waves of different frequencies and intensities.

Therefore, sound in general always contains a certain frequency range. The frequency range of sounds that can be heard by the human ear is between 20 and 20,000 hertz. Fluctuations above this range are called ultrasound, while those below this range are called infrasound.

Animals such as dogs and bats can hear sounds up to 160,000 hertz. Whales and elephants produce sounds with frequencies in the range of 15 to 35 Hz.

The propagation of sound is explained by quantum mechanics as the movement of atoms, which forms sound waves. But this is not related to nouns such as wave particles.