The Principle Of Action Of Acoustic Earmuffs

According to the sound insulation of the earmuffs, it can be divided into two types: active noise reduction and passive noise reduction
Here's how it works:

1. Passive noise reduction is to directly use the sound insulation material in the earcup for sound insulation, generally using sound insulation cotton to prevent noise from entering the ear;

2. Active noise reduction is to add a device in the earcup, and when receiving external noise waves, reverse sound waves are emitted at the same time, and two positive and negative opposite sound waves will be canceled out to achieve the effect of noise reduction. Because sound is a longitudinal wave, the superposition property of the wave can be used to make the wave reflected by the material and the incoming sound wave form the addition of peaks and troughs, that is, cancel the noise.

Then there is also an electronic noise-canceling earmuff with a pickup function, generally also known as tactical earmuffs, sports shooting earmuffs, which can be used not only at the shooting range, but also in noisy workplaces. For example: long-term work on the construction site will be subject to long-term noise disturbance and hearing damage; Wearing earmuffs can effectively reduce noise, but if there is danger on the construction site, the pickup function plays a role, other people's shouts, outside warning sounds can be cleared into the ears, so that you can reduce the noise of work while still watching in all directions.

Precautions for purchasing:

1. Choose earmuffs according to the noise environment you are in, active noise reduction is generally thousands, and under normal circumstances, you can choose ordinary earmuffs;

2. To consider the comfort of the earmuffs, some cottage earmuffs have good sound insulation performance, but the chuck is too tight and the material is poor;

3. Whether to support the replacement of accessories, such as sound insulation cotton is required to be replaced regularly