Is the noise canceling headset really as magical as the advertisement says?
In just a few years, the ads for noise-cancelling headphones were overwhelming. Even the crowdfunding website was crowded with ads for noise-cancelling headphones. It seems that it is not good to buy a noise-cancelling headset. As the advertisement says, is the noise-reducing earphone so amazing? In fact, the noise-cancelling earphone is not so mysterious. Its function is to reduce the noise outside the earphone as much as possible into our ears.
This is simple, our common professionals with enviable big earmuffs, this does not play this role! What's even more cool is that the American big film often sees handsome soldiers with the big color of this unique color. Hood. This big earmuff is the famous David Clark earphone. The next time you watch a movie, you can give your girlfriend a few words. This company sells well and has been imitated and never surpassed. No, the noise-reduction headphones we saw on the advertisements are not like this? Slightly, don’t worry, in general, noise-reduction headphones are divided into active noise reduction and passive noise reduction. In other words, noise-reduction headphones are divided into Active noise reduction and passive noise reduction, the "source" here is understood to be a power supply. Obviously David Clark's large earmuffs should belong to passive noise canceling headphones, and domestic advertising campaigns actually have Source noise canceling headphones.
So how does the active noise canceling earphone produce noise reduction? In fact, it is not complicated. First, the low frequency noise of the environment is collected through the microphone on the earphone, and then a reversed sound is quickly generated by the built-in arithmetic unit. Simultaneous playback, this can produce the magical effect of offsetting the environmental noise. There are many research articles on active noise reduction, the English abbreviation ANC, the full name is Active Noise Cancellation, interested in IEEE or Google academic search, ANC field But too wide, active noise canceling headphones is just one of the typical applications. Regarding the principle of active noise canceling headphones, you can continue to think about it with reference to the following figure:
It doesn't seem to be easy to understand. Let's look at the more simple and visual illustration below, but note that the actual situation is far more complicated than this picture. The noise itself is an extremely complex signal, and the types of noise in different scenes are also very different. It is still very difficult to completely grasp the law of these noises.
So what are the technologies of active noise canceling headphones? There are too many technologies, which is also a cross-disciplinary field. Active noise-reducing headphones still follow the classification of traditional audio, there are analog and digital points, the current analog-digital hybrid It is still mostly, so traditional audio technology is inevitable. In addition, the core of active noise canceling headphones is a complex set of algorithms, which are generally divided into feedforward and feedback according to their structural design. The specific algorithm details are no longer here. Explain that each algorithm also has its own advantages and disadvantages. Currently, the feedforward and feedback fusion algorithms are commonly used.
From the above analysis, the active noise canceling headphones can really play a good role in noise reduction, but there is no perfect technology in the world, and the active noise reduction technology must have limitations and shortcomings. A wide range of articles, this article affirmed the noise reduction effect of active noise canceling headphones, but this article believes that active noise canceling headphones can not block vocal or high-frequency noise, because there are legal requirements I heard the noise from the outside world. Actually, the active noise canceling headphones can't be technically done, and this is not a problem of pure technology upgrade. (The author also searched the Internet and found that many evaluation articles also say this, and In fact, the active noise reduction technology can offset the noise is very limited, only limited to some low-frequency steady-state noise, which is why many active noise canceling headphones emphasize the aircraft application scenario, because the aircraft The noise on it is quite special, and it fits the characteristics of active noise reduction technology. However, if you switch to subways, buses, etc., the noise reduction effect is actually not as significant as on the plane. For the general daily life scene, the active noise canceling headphones will not have much effect. Therefore, if you are not a business traveler who travels frequently on the plane, but just want to listen to high-quality music, choose an active noise-cancelling headset. Suitable.
Once again, the active noise canceling headphones need to be adapted to the application scenario. It is not that any scenes that are advertised are magical. In fact, it can't offset most of the noise in the life scene. If it is not a long-term business trip by plane. Users, buying really needs to be cautious. In addition, it should be emphasized that the active noise reduction technology simply emphasizes how many decibels are not of much significance, especially in China, which generally marks a certain peak point of noise reduction, and more importantly, it depends on the drop. Noise bandwidth range and average noise reduction. Writing here may be smashed by many domestic noise canceling headphones manufacturers, really helpless, we are more concerned about the many sincere friends of Acoustics Online. So we must continue to post a few Have consulted our questions and said the important things again!
1. Does the active noise canceling headphones affect the sound quality of music playback?
If turning on the active noise reduction mode will inevitably affect the sound quality, this may not be bad, because some people really like some kind of rendered sound, and the rendering of the sound in the active noise canceling headphones may make you feel comfortable, but If you want to listen to high quality music, don't turn this mode on. If you are a music enthusiast, you are really advised to choose a pair of HiFi headphones.
2. What are the general issues to pay attention to when purchasing active noise canceling headphones?
First of all, you should take a look at this article to understand some basic principles to prevent being fooled by others; secondly, you should first try to experience the effect of the store, if you are the first purchase, it is not recommended to buy directly online, first figure out the actual The effect is not too late; if you decide to buy, you still have to look at the parameter indicators, such as noise reduction range, average noise reduction, etc. Also pay attention to some virtual parameters, active noise reduction technology is still a Complex technology, the algorithm and hardware requirements are very high, if it is particularly cheap, you must be careful, now the noise reduction headset shipments are not enough to maintain the popularity of millet like 99 yuan. Add a little, but also pay attention to the battery problem After all, charging is not always a solution, and after-sales is also very important, don't forget, there are more speakers in the active noise canceling headphones. If it is not handled well, it will increase the noise and even howling, and the hardware is easy to use. Aging seriously affects performance, and there is no stable after-sales guarantee.
3. Can the noise canceling headphones really remove all noise?
Sorry, as I said before, the best noise canceling headphones will not block all the sounds. You will still hear the high frequency transient noise. What are the high and medium frequency noises? You will encounter these in your life every day. Annoying sounds. Even on the best applicable scene aircraft, the sound of the aircraft engine will enter your ears more or less. At present, there is no earphone that makes you feel that you are not on the plane, they will only let You forgot some. Don't believe in advertising, not so many miracles happen.
4. Can you recommend several active noise canceling headphones with good reputation?
This is more difficult, everyone is difficult to adjust, but also contrary to the purpose of our acoustic online. We can only say that the industry is more recognized as the Bose series, but the price is small, of course, there are many good brands at home and abroad, here will not do Advertising. In addition, active noise canceling headphones have three types of in-ear, on-ear and over-the-ear headphones. When purchasing, you can choose according to your own needs. Wearing comfort is also very important.
2.Super bright light source SMD2835,PMMA cover,high light efficiency 70-110LM/W,energy saving.
3.Die casting aluminum lamp housing,spurting processing surface,anti-oxidation,anti-corrosion.
4.High quality led driver,constant isolated current,improve lamp lifespan with 50,000hrs.
5.High CRI≥70,different color temperature 2700-7000K for option.
6.Green environmental protection,easy to install,and 2 years warranty.
LED Panel Light Advantages:
1. Energy-Saving and environment used
2. Low Heat Emisssion; Low energy consumption: Only 3W can replacement 25W
From the above analysis, the active noise canceling headphones can really play a good role in noise reduction, but there is no perfect technology in the world, and the active noise reduction technology must have limitations and shortcomings. A wide range of articles, this article affirmed the noise reduction effect of active noise canceling headphones, but this article believes that active noise canceling headphones can not block vocal or high-frequency noise, because there are legal requirements I heard the noise from the outside world. Actually, the active noise canceling headphones can't be technically done, and this is not a problem of pure technology upgrade. (The author also searched the Internet and found that many evaluation articles also say this, and In fact, the active noise reduction technology can offset the noise is very limited, only limited to some low-frequency steady-state noise, which is why many active noise canceling headphones emphasize the aircraft application scenario, because the aircraft The noise on it is quite special, and it fits the characteristics of active noise reduction technology. However, if you switch to subways, buses, etc., the noise reduction effect is actually not as significant as on the plane. For the general daily life scene, the active noise canceling headphones will not have much effect. Therefore, if you are not a business traveler who travels frequently on the plane, but just want to listen to high-quality music, choose an active noise-cancelling headset. Suitable.
Once again, the active noise canceling headphones need to be adapted to the application scenario. It is not that any scenes that are advertised are magical. In fact, it can't offset most of the noise in the life scene. If it is not a long-term business trip by plane. Users, buying really needs to be cautious. In addition, it should be emphasized that the active noise reduction technology simply emphasizes how many decibels are not of much significance, especially in China, which generally marks a certain peak point of noise reduction, and more importantly, it depends on the drop. Noise bandwidth range and average noise reduction. Writing here may be smashed by many domestic noise canceling headphones manufacturers, really helpless, we are more concerned about the many sincere friends of Acoustics Online. So we must continue to post a few Have consulted our questions and said the important things again!
1. Does the active noise canceling headphones affect the sound quality of music playback?
If turning on the active noise reduction mode will inevitably affect the sound quality, this may not be bad, because some people really like some kind of rendered sound, and the rendering of the sound in the active noise canceling headphones may make you feel comfortable, but If you want to listen to high quality music, don't turn this mode on. If you are a music enthusiast, you are really advised to choose a pair of HiFi headphones.
2. What are the general issues to pay attention to when purchasing active noise canceling headphones?
First of all, you should take a look at this article to understand some basic principles to prevent being fooled by others; secondly, you should first try to experience the effect of the store, if you are the first purchase, it is not recommended to buy directly online, first figure out the actual The effect is not too late; if you decide to buy, you still have to look at the parameter indicators, such as noise reduction range, average noise reduction, etc. Also pay attention to some virtual parameters, active noise reduction technology is still a Complex technology, the algorithm and hardware requirements are very high, if it is particularly cheap, you must be careful, now the noise reduction headset shipments are not enough to maintain the popularity of millet like 99 yuan. Add a little, but also pay attention to the battery problem After all, charging is not always a solution, and after-sales is also very important, don't forget, there are more speakers in the active noise canceling headphones. If it is not handled well, it will increase the noise and even howling, and the hardware is easy to use. Aging seriously affects performance, and there is no stable after-sales guarantee.
3. Can the noise canceling headphones really remove all noise?
Sorry, as I said before, the best noise canceling headphones will not block all the sounds. You will still hear the high frequency transient noise. What are the high and medium frequency noises? You will encounter these in your life every day. Annoying sounds. Even on the best applicable scene aircraft, the sound of the aircraft engine will enter your ears more or less. At present, there is no earphone that makes you feel that you are not on the plane, they will only let You forgot some. Don't believe in advertising, not so many miracles happen.
4. Can you recommend several active noise canceling headphones with good reputation?
This is more difficult, everyone is difficult to adjust, but also contrary to the purpose of our acoustic online. We can only say that the industry is more recognized as the Bose series, but the price is small, of course, there are many good brands at home and abroad, here will not do Advertising. In addition, active noise canceling headphones have three types of in-ear, on-ear and over-the-ear headphones. When purchasing, you can choose according to your own needs. Wearing comfort is also very important.
LED Panels Light
LED Panel Light Features:
1.New ultrathin design,modern and simple,can be widely used in home and public places.2.Super bright light source SMD2835,PMMA cover,high light efficiency 70-110LM/W,energy saving.
3.Die casting aluminum lamp housing,spurting processing surface,anti-oxidation,anti-corrosion.
4.High quality led driver,constant isolated current,improve lamp lifespan with 50,000hrs.
5.High CRI≥70,different color temperature 2700-7000K for option.
6.Green environmental protection,easy to install,and 2 years warranty.
LED Panel Light Advantages:
1. Energy-Saving and environment used
2. Low Heat Emisssion; Low energy consumption: Only 3W can replacement 25W
LED Panel Light
LED Panel Lights,LED Ceiling Panel Lamp,Recessed LED Flat Panel Light,Surface LED Flat Panel Light
FOSHAN OUHONG LIGHTING CO., LTD. , http://www.soelighting.com