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TRG-TRC007-EN 15
notes
The study of acoustics is affected by the response of the human ear to sound
pressure. Unlike electronic sound-measuring equipment, which provides a
repeatable, unbiased analysis of sound pressure, the sensitivity of the human
ear varies by frequency and magnitude. Our ears are also attached to a highly
arbitrary evaluation device, the brain.
Human Ear Response
The ear acts like a microphone. Sound waves enter the auditory canal and
impinge upon the ear drum, causing it to vibrate. These vibrations are
ultimately transformed into impulses that travel along the auditory nerve to
the brain, where they are perceived as sound. The brain then analyzes and
evaluates the signal.
period two
Sound Perception and Rating
Methods
Fundamentals of HVAC Acoustics
Figure 18
The Human Ear
outer
ear
outer
outer
ear
ear
auditory
canal
auditory
auditory
canal
canal
eardrumeardrum
eardrum
middle
ear
middle
middle
ear
ear
nerves
to brain
nerves
nerves
to brain
to brain
Figure 19
period two
Sound Perception and
Rating Methods