acoustics

Question 1

what is a sound wave?

Answer 1

pattern of disturbance caused by the movement of energy traveling through a medium as it propogates away from source of sound (such as vibration/persons voice)

Question 2

Properties of sound waves physical -> psychological

Answer 2

frequency -> pitch
amplitude -> loudness
phase -> quality

Question 3

frequency is measured in…

Answer 3

hertz, the number of cycles per second

ex. 500 cps = 500 HZ

Question 4

msec to seconds

Answer 4

.001 msec = 1 second ( move over 3 spaces)

Question 5

period and frequency problems

Answer 5

period = 1/frequency
frequency = 1/period

Question 6

human hearing frequency…

Answer 6

20-20000 hz

Question 7

minimum audibility curve

Answer 7

0-140 db SPL range of amplitude limits
threshold of feeling/hearing = upper limit/threshold of pain
minimum audibility curve= just audible sounds/lower limit

Question 8

phase

Answer 8

stage of cycle at any given point in time

Question 9

db SPL

Answer 9

objective measurement of sound

reference = 20 micropascals

Question 10

dbHL

Answer 10

0 dBHL average human threshold

Question 11

dbSL

Answer 11

for patients with hearing loss at a constant level above threshold

Question 12

when converting dbHL to SPL you…

Answer 12

ADD

Question 13

when converting SPL to HL you…

Answer 13

subrtraact