What is the concept of noise reduction 40db, is noise reduction 35db better or 40db

The concept of reducing noise by 40 decibels should be very powerful, the sound feels quieter, and people feel more comfortable.

down to 40db. Indicates that the noise has been reduced to a certain extent. The level of decline reached a normal standard of living.

Hello! The volume of the sound,About the volume of the TV set 10 only represents a personal point of view,Don't spray if you don't like it,Thank you。

It's actually a decibel of noise, and it's the basic concept.

For this question, what is the concept of this one, and which one is better to do this charger yourself.

What is the concept of 40 DP? Lend you to log in to my noise** consultation.

If you want to ask this question, which angles and which dimensions of the concept, take a look at it yourself, study it and ask it.

The Chinese of DB is called decibels, and the decibel is a ratio coefficient, which is used in science and technology for radio transmission, electromagnetic fields, optics, acoustics, ---, etc., and the terms used to explain it are all jerky professional language;

Decibels can also be used to describe the amount of noise, according to the scientific method: 1 decibel is the smallest sound a person can hear, roughly equivalent to the sound of a mosquito flying 3 meters away. Other examples of noise are as follows:

The national standard "GB T7725 Room Air Conditioner" stipulates that the noise limit of household indoor air conditioners is a maximum of 40 decibels; The national standard "GB3096 Environmental Noise Standard for Urban Areas" stipulates that the noise limit for residential areas is 55 decibels during the day and 45 decibels at night.

40db is good, and the noise reduction depth is large. The active noise reduction function is to neutralize the noise by generating a reverse sound wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction. Active noise cancelling headphones have noise cancellation circuits to compete with external noise, and most of them are large head-mounted designs, which can use the earbud cotton and earphone shell to block external noise for the first round of sound isolation, and also to have enough space to install active noise cancellation circuits and power supplies.

Principles of application. 1. The signal microphone placed in the earphone first detects the low-frequency noise in the environment (100 1000Hz) that can be heard by the ear.

2. Then the noise signal is transmitted to the control circuit, and the control circuit performs real-time calculation.

4. After superimposing, the noise disappears and cannot be heard.

Summary. Hello dear <>

40db noise reduction is goodAt present, it seems that many active noise cancelling headphones have put the noise cancellation depth at 40db, and the noise energy of 40db deep noise cancellation cancellation is basically about 3 times that of 35db. Active Noise Cancellation is a noise reduction technology that is one of the methods used in headphones to reduce noise. The active noise cancellation function is to neutralize the noise by generating a reverse sound wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction.

Is it better to have 35db or 40db of noise reduction.

43db and 40db that noise-canceling headphones are good.

Hello dear <>

40db noise reduction is goodAt present, it seems that many active noise cancelling headphones have put the noise cancellation depth at 40db, and the noise energy of 40db deep noise cancellation cancellation is basically about 3 times that of 35db. Active Noise Cancellation Limb Sleepiness is a kind of base sock noise reduction technology, which is one of the methods used in headphones to reduce noise. The active noise cancellation function is to neutralize the noise by generating a reverse sound wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction.

Hello dear <>

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<> which noise reduction effect is better between 40db and 43db.

Hello dear <>

Compared with 40dB and 42dB noise reduction, 42dB is good. The active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system to neutralize the noise, so as to achieve the effect of noise reduction. Most of them adopt a large head-mounted design, which can use earbud cotton and earphone shell to block external noise and carry out the first round of sound insulation.

Okay, thank you. Hello dear <>

You're welcome.

22db noise reduction can be understood as 22 decibels, and the sound is very small. Basically, you can only hear it when you're close to the chassis.

The lower the decibel number, the quieter the sound and the quieter it feels. The sound of people usually talking can reach 65 decibels, and 22db is a very small noise level, which can be said to be quite quiet.

Noise-canceling headphones. Noise-canceling headphones, with active noise control, are different from the passive sound isolation of ordinary headphones. Here's how it works:

1.First, the signal microphone installed in the earphone detects the low-frequency noise in the environment (100 1000Hz) that can be heard by the ear (3000Hz is now possible).

2.The noise signal is then transmitted to the control circuit, and the control circuit performs real-time calculation.

3.The Hi-Fi horn cancels out the noise by emitting sound waves of the same amplitude opposite to the noise phase.

4.So the noise disappears and is inaudible.

Active Noise Cancelling Headphones** are expensive, but generally provide excellent results and are comfortable to wear. However, they require a separate battery to operate, and most passive noise-cancelling headphones can be used without draining power (nor with active noise cancellation).

The slight noise of refrigerator operation in the dead of night is about 37db.

The noise of the indoor unit of the air conditioner is 25-49db, which is the noise of 25-49 decibels.

0db is the faintest sound a person can just hear; 30-40db is an ideal quiet environment; 70db will interfere with conversation and affect work efficiency; Living in a noisy environment of more than 90db for a long time will seriously affect your hearing and produce neurasthenia, headaches, high blood pressure and other diseases; If suddenly exposed to noise up to 150db, the eardrum will rupture and hemorrhage, and both ears will lose hearing completely.

According to the ordinary person's sense of hearing.

Cosmic volume -254 dB absolutely silent.

0 20 dB It's so quiet that it's almost invisible;

20 40 dB Quiet, like a whisper;

40 60 dB Normal, Ordinary Indoor Conversation;

60 70 dB noisy, nerve-damaging;

70 90 dB It's noisy, nerve cells are destroyed.

90 100 dB Increased noise, hearing loss;

100 120 dB Unbearable, a minute of deafness is temporary.

More than 120 dB Extremely deaf or totally deaf.

The noise reduction value of 40db and 35db is not large, the db mentioned here is calculated from 120 decibels as 0 points in life, and db is actually a ratio, a numerical value, a pure counting method, without any unit marking, in different fields have different names, so it also represents different practical meanings.

Sound absorption and noise reduction is a method of controlling the intensity of noise in the propagation pathway. The sound-absorbing effect of an object is universal, and the sound-absorbing effect is related not only to the sound-absorbing material, but also to the sound-absorbing structure chosen. This technique is mainly used in interior spaces.

A muffler is a device that allows airflow to pass through and effectively reduces noise. Mufflers are often used to reduce the noise transmitted at the inlet and outlet of various aerodynamic equipment or along pipes.

Sound insulation. The practice of enclosing noise-producing machinery and equipment in a small space to isolate it from the surrounding environment to reduce the impact of noise on the environment is called sound insulation. Noise barriers and enclosures are the two main designs, along with other soundproofing structures:

Acoustic chambers, acoustic walls, acoustic curtains, acoustic doors, etc.

The above content refers to Encyclopedia - Noise Reduction.

The 40db noise is equivalent to the hum of a refrigerator. The noise level of 30-40 decibels belongs to the relatively quiet normal environment of Shibu, of which 30 decibels is equivalent to the volume of a whisper, 40 decibels is equivalent to the hum of a refrigerator, and the normal conversation sound between people is about 60 decibels.

Decibel, is a unit of measurement that measures the proportion of two identical units, mainly used to measure the intensity of sound, abbreviated as DB, named after the American inventor Alexander Graham Bell.

According to the relevant regulations of our country, the noise standard of indoor state shouting is more than 55 decibels during the day and more than 45 decibels at night.

A noise of 70 decibels is equivalent to walking in a downtown area, a noise of 85 decibels is equivalent to the sound of a car on the road, a noise of 95 decibels is equivalent to the sound of a motorcycle starting, and a noise of 110 decibels is equivalent to the sound of karaoke.

Operating environment

Brand model: general

System version: General