In short, when the noise вЂњAвЂќ is detected by an external pickup, the earbuds will instantly produce a sound вЂњ- AвЂќ. Pick-up Microphone(monitoring environmental noise) в†’ Processing Chip (analyzing noise curve) в†’ Loudspeaker (generating echo sound wave) в†’ Completing the process of noise reduction synthesis.

The Hi-Fi horn emits sound waves with opposite phase and same amplitude to cancel the noise.

Transmit the noise signal to the control circuit and perform real-time operation.

The signal microphone installed in the earphone detects the low-frequency noise (100-1000HZ) (up to 3000hz at present).

And the opposite phase can completely eliminate the noise.Дifferent from the traditional PNC, ANC technology generates a group of inverse sound waves with the same phase as the noise to be eliminated to neutralize the noise.ДЄctive noise reduction headphones apply a highly sensitive acoustic microphone to collect the surrounding noise, and then use the built-in processor to calculate a sound wave which is completely opposite to the noise in real time to achieve noise cancellation. We can find a sound whose spectrum is exactly the same as the noise you want to eliminate. The PrincipleВ of ANCДЄll sounds are composed of a certain spectrum. In 1989, Bose company launched the first ANCВ headset, which is specially designed for aviation industry practitioners.В With the development of technology, ANCВ is gradually extending from high-end application to civil market. The concept of ANCВ was first proposed by Dr. In order to actively eliminate the noise and deal with low-frequency noise (such as peopleвЂ™s conversation, air conditioning noise, electrical engine noise, etc.), people invented the вЂњactive noise reductionвЂќ technology. Besides, when canceling the high frequency noise, it will also isolate the important part of human voice, which brings inconvenience to life. When facing with low and medium-frequency noise, the PNC headphones are useless. However, this cancellation is aiming at the shielding effect of high frequency noise.

Passive Noise Control(PNC)В means blockingВ the sound via the earphone shape design and using the internal filling material. The threeВ noise reduction measures(canceling noise at the sound source/in the process of transmission/inВ the human ear), which are those conventionally used,В are passiveВ noise control. One is Passive Noise Control(PNC), another is what we will mainly discussed today: Active Noise Control(ANC).

Nowadays, there are two famous noise control technologies in noise-canceling. In order to focus on work or enjoy pure music, people have devoted toВ lots of technical researches in the field of noise reduction headphones.

Are you tired of the engine noise of vehicles on the way to work? Wanna get rid of whispering of colleagues at work? What you need is the earbuds with ANC technology.ДЄs an incidental, annoying sound, noise has interrupted peopleвЂ™s daily life.

Active sound control