What Is The Noise Reduction Principle Of Noise-canceling Earplugs?
Foam Earplugs
Principle of foam noise-canceling earplugs is to utilize the density and structure of the foam material to absorb and block external sounds. These earplugs are made of soft polyurethane foam with an open-cell structure, allowing them to expand when inserted into the ear canal, filling it and sealing the surrounding space. As external sounds pass through the earplugs, the foam absorbs the sound waves and converts them into tiny amounts of heat, thereby reducing the propagation of sound.
Silicone earplugs can reduce noise mainly due to their material and design. Made of soft silicone, these earplugs effectively fill the ear canal and create a seal, preventing external noise from entering the ear. This seal reduces the likelihood of environmental noise transmitting to the cochlea, thereby decreasing interference with the auditory system.
Moreover, silicone earplugs are typically designed with consideration for the anatomical structure of the human ear to ensure a comfortable fit. This snug fit also helps reduce the entry of external noise.
However, it's important to note that silicone earplugs are not specifically designed for noise reduction but rather for sound isolation. While they can help reduce the interference of environmental noise, in extremely loud environments such as factories or airplane engine noise, specialized noise-canceling earplugs or headphones may still be necessary for more effective protection.
