The Acoustic Reflex in Industrial Impact Noise

  • Roland Nilsson
Part of the NATO ASI Series book series (NSSA, volume 111)


The purpose of the transmission system of the ear (outer and middle ear) is to receive and transmit the sound waves to the inner ear (Fig. 1). From the viewpoint of energy, this is done by means of a number of transformations; from the acoustic energy of the air to a mechanical motion energy on the part of the eardrum and the chain of auditory bones. Then, the hydro-mechanical motion of the inner ear is converted into bioelectrical energy in the hair cells and the auditory nerve. At low and moderate sound levels, the transmission characteristic of the sound transmission system is primarily linear and the amount of energy transmitted to the cochlea is determined by the resonance of the outer ear and the amplification of the middle ear [1]. At higher sound levels, the acoustic middle ear reflex (AR) is activated causing the impedance of the system to increase and the transmission of the sound energy to decrease.


Hearing Loss Hair Cell Noise Exposure Impulse Noise Reflex Threshold 
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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Roland Nilsson
    • 1
  1. 1.Research DepartmentProjekt LindholmenGoteborgSweden

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