Knock deafness

Also known as deafness deafness, intermittent impulse noise damage caused by guns or bomb explosions. The noise is very strong and the peak of the frequency spectrum changes greatly. The noise of the automatic rifle reaches 174dB, and the cannon reaches 188dB. When the cannon is fired, a strong positive pressure wave is generated instantly, the pressure can reach 3000kg / cm2, and it lasts for 5ms. The following is a negative pressure wave, which can last for 30ms, which is collectively called pressure wave. Such strong noise and shock waves are most likely to cause hearing impairment.

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