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Audiology Chap 2
Audiology Chap 2
17
Audiology
Graduate
09/09/2011

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Term
Reflection
Definition
when an incident wave, or first arriving wave, encounters an obstruction it is reflected back onto itself
Term
Diffraction
Definition
if a wave encounters an object that only partially obstructs its path, it will continue past the object, changing its shape ai it wraps around the obstruction
Term
Incident Wave
Definition
the arriving wave of sound
Term
Impedance
Definition
described as the net effect of all forces that oppose vibration
Term
Admittance
Definition
the inverse of impedance, describing how well sound allow entry into a medium
Term
Sinusoid or Sine Wave
Definition
pure tone
Term
Decible (dB)
Definition
Often uses 20upa as its reference pressure, representing the approximate threshold of sound detection for the human ear. Simply a scale of relative measure of intensities or pressures. Prefix (deci) means one tenth, (bel) by a factor of 10
Term
Frequency
Definition
the number of times per second that a number occurs
Term
Pascal
Definition
science of sound is concerned with pressure, defined as force per unit area. Equivalent to one newton of force applied to one square meter of area
Term
microPascal (upa)
Definition
millionths of a pascal
Term
Decibel Hearing Level (dBHL)
Definition
in audiologic settings, the reference pressure is frequency specific and represents the threshold for sound detection by normally functioning human ears at particular frequencies
Term
Decibel Sensation Level (dBSL)
Definition
uses a subject's actual hearing sensitivity threshold as its reference level
Term
Decibel Intensity Level (dBIL)
Definition
Decibel scale commonly used commonly used in industrial and community noise settings is called the dBA scale. Engineering and electrical applications commonly use 10 to the negative 18th power watts/cm squared as the reference intensity , resulting in the ? scale
Term
Inverse Square Law
Definition
the relationship between distance that sound travels and energy it loses is known as?
Term
Decibels dB
Definition
Intensity is always measured in?
Term
Detection
Definition
minimum perceptual intensities
Term
Discrimination
Definition
how different stimuli have to be to no longer appear the same
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