Do noise cancelling headphones work the same way as noise cancelling microphones?

Noise cancelling headphones are mainly divided into two kinds according to the principle: one is passive noise cancellation (passivenoise-cancelling) headphones, the other is active noise cancellation (activenoise-cancelling) headphones 1, passive noise cancelling headphones, also known as physical noise reduction, in fact, it is to do sound isolation is through the sound insulation materials or special structures on the headphones, and try to isolate noise mainly in-ear earbuds and full-cover earphones, but due to the overly tight design, Long-term wear will make the ears swelling and painful, excessive sound pressure will even affect the hearing 2, active noise reduction headphones, through the noise reduction module in electronic noise reduction, is set up in the earphones A special noise reduction circuit is generally through the audio receiver (such as a micro microphone) and the anti-noise output chip, through the reception, analysis of the frequency of external noise and the opposite frequency, mutual weakening or canceling, so as to achieve the purpose of shielding noise Generally speaking, active noise cancelling headphones, the headphones themselves have an "ear", "ear" It is used to listen to external noise, because its "ear" is very close to our cochlea, the ambient noise it hears is very close to the noise that is about to reach the human ear, but there is still a slight deviation; After receiving the noise, the internal electronic noise anti-noise chip will calculate the audio (set to a) and the audio of the noise (set to b) of the file itself, and the actual audio broadcast is actually a b, and the noise b will still be transmitted to the cochlea, then the audio received by the cochlea is a b b a extended information: noise cancelling headphones refer to a kind of earphone noise reduction headphones that use a certain method to reduce noise, using active noise control, different from the passive sound isolation of general headphones, its principle is:

1.The signal microphone installed in the earbuds detects the low-frequency noise (100 1000Hz) in the environment that can be heard by the ear2Then the noise signal is transmitted to the control circuit, and the control circuit performs real-time calculation3

Summary. The basic principle of noise-canceling microphones: two microphones are assembled in the same hearing aid according to strict acoustic principles, so that the sound signals arriving at different angles can be amplified differently, so as to enhance useful signals and relatively reduce background noise.

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The biggest difference between a noise-canceling microphone and a microphone is that a noise-canceling microphone refers to a microphone that uses directional processing of sound signals to improve the signal-to-noise ratio, so that users can hear clearly what they say to the person who regrets it when there is background noise.

Pro, the basic principle of noise reduction microphone: it is to assemble two portable microphones in the same hearing aid according to the strict acoustic principle of the state, so that the sound signal arriving at different angles can be amplified differently, so as to enhance the useful signal and relatively reduce the background noise.

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The principle of noise cancellation is to use a signal processing circuit, relying on a small microphone to sample the ambient noise, and then slide to generate an inverted signal in the headphones to eliminate the noise.

First of all, due to the use of small microphones to pick up voices, it is also believed that the limb stool means that this type of headset is impossible to hifi.

Because it is impossible for a small microphone to guess 100% of the sampled signal, it cannot output a 100% accurate anti-signal.

That is, such headphones will create unwanted noise to a certain extent.

Noise-canceling microphone refers to a microphone that uses directional processing of sound signals to improve the signal-to-noise ratio, so that users can hear the person on the other side clearly when there is background noise.

1. The two microphones are assembled in the same hearing aid according to the strict acoustic principle, so that the sound signals arriving at different angles can be amplified differently, so as to enhance the useful signal and relatively reduce the background noise.

2. Dual-microphone noise reduction technology is the most common noise reduction technology used on a large scale, one microphone is used by ordinary users when talking to collect human voices, and the other microphone configured at the top of the fuselage has the function of background noise collection, which is convenient for collecting surrounding environmental noise.