Does the noise canceling headphones need to be in our lives? If you live alone or live in a no-noise environment, it is inevitable that noise reduction is a useless function for you. However, as a daily street use, Xiaobian sometimes prefers a cheap noise-cancelling headset and does not wear a high-end earphone. The superiority of the noise reduction function when going out is self-evident.
Classification of noise canceling headphones:
The noise-cancelling headphones that we often say in our mouths are the active noise-cancelling headphones that we have to say today through chip processing. The biggest feature of this kind of active noise canceling headphones is that a noise reduction processing chip will be added in the headphone wire control or the earphone. The ambient sound is then received through a microphone on both ear cups of the headset. By dealing with the principle of generating reversed sound waves, it is offset by the external environment sound to achieve the purpose of active noise reduction.
The principle of active noise reduction is the same, but the specific technologies used by various manufacturers are different, and the ability and effect of noise reduction will be different. Therefore, the effects will vary greatly, each with its own advantages and characteristics.
Active passive noise reduction technology to explain:
There are two ways to reduce noise in headphones, active noise reduction and passive noise reduction. Passive noise reduction is actually very common on a daily basis, and active noise reduction technology has only been in its infancy in recent years, but the development of both types of headphones has great prospects. Let's talk about what is passive noise reduction. At present, most noise reduction methods are passive noise reduction. According to the materials and parts used by the Earphones, it can be divided into three kinds of processing methods: vibration damping noise, sound absorption noise and sound insulation noise. In most cases, it is usually a combination of multiple methods. According to the current material technology and processing technology, any noise can be basically treated. Such earplugs are generally based on in-ear earplugs, and common in-ear earphones can be referred to as passive noise canceling earphones.
Even the headphones with passive noise reduction technology can't resist the low frequency noise, so this has led to the development of active noise reduction technology. The active noise reduction function is to generate reverse sound waves equal to the external noise through the noise reduction system. Noise is neutralized to achieve noise reduction.
In order to proactively eliminate noise, the technology of "active noise reduction" was invented. Its principle is: all sounds are composed of a certain spectrum. If a sound can be found, the spectrum is exactly the same as the noise to be eliminated, but the phase is just the opposite, and the noise can be completely cancelled out. The key is how to get the sound that cancels the noise. The actual approach is to start with the noise source itself and try to reverse the phase of the original noise through the electronic circuit. From this point of view, the technology of active noise reduction actually uses a positive and negative phase to offset the poison.
Active noise reduction technology application areas:
The emergence of active noise reduction technology has met many people who have certain requirements for environmental sound in professional fields, or those who need to answer customer calls in noisy environments, or those who need to rely on sound to judge enemy or teammates. The professional e-sports master, because for these two areas, the sound is the basis of its life.
Nowadays, in order to realize the function of active noise reduction, it must be powered by dry battery to meet the needs of noise reduction. Of course, if you do not need to use this function, there is no problem at all. Now many manufacturers have already had active noise reduction. Products, this feature has even become the standard configuration, especially those such as innovation, UE, Magic Sound and other brands, have begun to focus on the series of products, and domestic manufacturers such as Selbel have already been this One technology is carried forward, and what is even more surprising is that the price of headphones with active noise reduction technology has a lot of people-friendly trends.
It can be said that the scope of active noise reduction is not widely used. However, in a specific population, the value of its existence is still necessary. According to Xiaobian's understanding, in the field of car audio, the application of active noise reduction technology can give The narrow space of the car provides a wider sound field. Cadillac is the first brand to apply active noise reduction technology to the automotive sector. In the first quarter of 2013, the Cadillac XTS luxury sedan, which is listed in China, has an active noise reduction mute system (ANC) for the BOSE 5.1 ​​surround sound advanced sound system. The noise samples are collected by the in-car microphone. After the system analysis and processing, the speaker of the car audio is used. Play the opposite audio to counteract the noise waves and create a quieter interior.
About the understanding of headphones and audio sources:
Source: The source has two meanings, one is the carrier that records the sound. Such as the vinyl era of the analog era, tape. Then go to the CD of the digital age, and the MD that is forgotten. Then, due to the advent of the Internet age, files such as MP3, AAC, and WAV that can be downloaded from the network can be downloaded.
Another meaning of the sound source refers to the device that plays the sound source carrier. The mobile phone, MP3 player, etc. in your hands can be understood as a sound source. The enthusiast's decoder DAC, CD player, turntable, amp, amplifier, etc. should be understood as sound source. Their role is to turn the music resources into analog signals, and the human ear can hear the sound through the headphone speaker.
Let's take SONY's latest release of D100. The same headphones, the same music files. Why do some netizens listen to the D100 and then listen to it with their own player, then they feel that the sound from their player can't be heard? In fact, this is the principle of complement each other. The player relies on headphones to show its strength. The headphones also rely on advanced players to provide a powerful signal source.
According to the above principle, the noise reduction headphones are not as good as the ordinary headphones. The noise reduction function does not affect the signal output quality of the source, nor does it affect the transmission quality of the signal. Therefore, the theory that noise reduction will lead to a decline in sound quality, Xiaobian said negative.
Analysis of the advantages and disadvantages of noise canceling headphones:
Noise-cancelling headphones are not without drawbacks, as mentioned in Xiaobian. Excessive noise reduction may cause the user to hear dangerous warnings and pose a danger. Therefore, Xiaobian suggested that when you walk on the street, please do not use noise-cancelling headphones (the same is true for ordinary in-ear earphones) to ensure your road safety.
Disadvantages 2: Battery. Since active noise reduction requires battery power, the battery power will be used up. And basically all the noise canceling headphones will not work properly after the battery is used up. Manufacturers have also taken this into account. Most noise-cancelling headphones are powered by a AAA battery and can be replaced at any time. Of course, there are exceptions. BOSE's latest QC20 earphones use a built-in lithium battery and can be used after turning off the noise reduction function. You can also listen after the battery is exhausted. This makes the practicality of the noise canceling headphones to a higher level.
The advantages of noise canceling headphones are like its name. When you are outside, or when you are studying in the classroom late, it is impossible to have a quiet environment. Only the noise-reducing headphones made by modern technology can let us ignore the outside world and enjoy pure music all the time.
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