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JEM Audio Exam 2

Terms in this set (77)

Sound
vibrations that set in to motion longitudinal waves of compression and rarefaction propagated through molecular structures such as gases, liquids, and solids.
sound
sound has both physical (technical) psychological (aesthetic qualities. often depicted as sound waves
sound characteristics
frequency
amplitude
velocity
sound envelope
direct sound
indirect sound
frequency
the number or cycles (one complete up and down motion from compression to rarefaction) per second. expressed in hertz (Hz) also known as pitch
amplitude
the amount of molecule displacement from equilibrium to the sound wave's height (crest) and depth (trough). known as sounds loudness. measured in decibles (dB)
Sound Envelope
a sound's shape, or change in loudness over time.

four stages:ADSR
attack
initial decay
sustain
release
direct sound
sound that reaches the listener first
indirect sound
sound that reaches the listener shortly after direct sound. comprised of early reflections and reverberation
The Ear and Hearing
the ear is comprised of: outer ear, middle ear, and inner ear
Outer ear
focusing the sound into the middle ear
middle ear
protects from loudness and produces vibration for the inner ear
inner ear
converts sound to electrical signal (cochlea) that is sent to the brain via the auditory nerve
acoustic sound
measured by sound-pressure level (dB-SPL)
threshold of hearing
0 dB-SPL
threshold of feeling
120 dB-SPL
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