AN AUDIO DEMONSTRATION OF HOW EARS ARE MORE SENSISTIVE TO CHANGES IN LOW FREQUENCY NOISE, AND OF HOW LIGHTWEIGHT CONSTRUCTIONS CAN PERFORM WELL AT LOW FREQUENCIES

摘要

The human ear is a complicated and extraordinary device which allows us to hear. The ear consists of the outer, middle and inner ear (see Figure 1) and is designed to collect and amplify pressure waves. These are then transmitted via nerves to the brain and is registered as sound. The normal hearing frequency range for a healthy young person is 20Hz to 20kHz. However the ear is not a linear device and Figure 2 shows how our ears are more sensitive to mid and high frequency sound than low frequency sound.