fundamentals of sound - final exam

Question 1

speed of sound

Answer 1

35,000 cm/s

Question 2

sound propagation

Answer 2

sound is a mechanical wave

moves through a medium by the movement of particles

Question 3

compression

Answer 3

areas of high pressure

Question 4

rarefaction

Answer 4

areas of low pressure

Question 5

sine waves

Answer 5

simple form

pure tone

frequency, amplitude, phase

Question 6

complex waves

Answer 6

sum of multiple sine waves

repeating patterns, more complex than simple sine waves

Question 7

frequency

Answer 7

number of cycles completed in 1 second

Hz

f = 1/T

Question 8

period

Answer 8

T

how long it takes for a wave to complete 1 cycle

Question 9

amplitude

Answer 9

height of a wave

loudness

Question 10

phase

Answer 10

position of the wave at a point in time

where in the wave it starts on the graph

measured in degrees

Question 11

power spectrum

Answer 11

no time dimension - single point in time

x-axis = frequency
y-axis = amplitude

Question 12

component frequencies

Answer 12

individual frequencies that make up a complex sound

Question 13

fundamental frequency

Answer 13

common denominator of all of the component frequencies

lowest

Question 14

aperiodic sounds

Answer 14

noise & transients

Question 15

noise

Answer 15

no repeating pattern

white noise

Question 16

transients

Answer 16

brief, non-repeating sounds

claps, bursts

Question 17

high pass filters

Answer 17

passes frequencies above a certain cutoff

Question 18

low pass filter

Answer 18

passes frequencies below a certain cutoff

Question 19

bandpass filter

Answer 19

passes frequencies within a specific range & attenuates frequencies outside this range

Question 20

bandwidth

Answer 20

the range of frequencies that a filter allows to pass through

Question 21

series

Answer 21

only frequencies that will pass through both filters will pass through the combined filter

Question 22

parallel

Answer 22

frequencies that pass through either filter will pass through the combined filter

Question 23

seconds –> milliseconds

Answer 23

1s = 1000ms

move decimal 3 places

Question 24

frequency & period

Answer 24

f = 1/T
T= 1/f

Question 25

time domain

Answer 25

represents a signal over time

Question 26

frequency domain

Answer 26

represents how much of each frequency is present in the signal at a single given time

Question 27

steeper filter slope = what __________ bandwidth

Answer 27

narrower bandwidth

Question 28

how do you determine a wave’s period from a graph

Answer 28

measure the time interval for 1 complete cycle of the wave

Question 29

how do you identify if a waveform is periodic

Answer 29

it repeats its pattern at regular intervals

Question 30

frequency & wavelength relationship

Answer 30

freq inversely proportional to wavelength

Question 31

how can you match time & freq domain signals

Answer 31

analyze the periodicity in the time domain & the corresponding peaks in the freq domain