Nature of Sound

Question 1

what can change speed of sound?

Answer 1

temp, humidity & elevation

Question 2

speed of sound in meters?

Answer 2

340 m/s

Question 3

speed of sound in feet?

Answer 3

1 ft/ms

Question 4

speed of sound in km?

Answer 4

1 km/3 sec

Question 5

speed of sound in miles?

Answer 5

1 mi/5 sec

Question 6

propagation and reflection create what?

Answer 6

our sense of space

Question 7

what is the width of the wave?

Answer 7

amplitude

Question 8

what is the length of a wave?

Answer 8

frequency

Question 9

what is the extent of compassion and rarefaction?

Answer 9

amplitude

Question 10

what kind of wave - vibration is perpendicular to the propagation

Answer 10

transverse wave (pond)

Question 11

what kind of wave - vibration is parallel to the propagation

Answer 11

longitudinal wave (sound)

Question 12

amplitude is measured in

Answer 12

dB

Question 13

changes in amplitude show (2)

Answer 13

pressure varying in the air & voltage varying in a cable or wire

Question 14

dBSPL

Answer 14

decibels of Sound Pressure Level (air)

Question 15

lowest dBSPL

Answer 15

threshold of hearing (0 dBSPL)

Question 16

highest dBSPL

Answer 16

human pain threshold

Question 17

dBFS

Answer 17

decibels of Full Scale (computer)

Question 18

highest dBSPL

Answer 18

0

Question 19

what is our perception of loudness is affected by?

Answer 19

duration and frequency

Question 20

panning, dynamic plugins, expanders, gates, limiters, compressors are functions of

Answer 20

amplitude

Question 21

what is dynamic range?

Answer 21

the dB in which is will reproduce sound properly, between the noise floor and distortion

Question 22

what_s the difference between frequency and pitch?

Answer 22

frequency can be measured, pitch is something we perceive

Question 23

only a sin wave has a single frequency, everything else has

Answer 23

overtones

Question 24

what is EQ?

Answer 24

a collection of filters which manipulate the timber

Question 25

range of human hearing

Answer 25

20Hz - 20,000Hz (18kHz actually)

Question 26

oscilloscope

Answer 26

time (x) amp (y), the exact path the sound will make in the air coming out of the speaker

Question 27

spectrum analyzer

Answer 27

freq (x) amp (y)

Question 28

spectrogram

Answer 28

spectrum analyzer over time

Question 29

what makes instruments sound different?

Answer 29

the relative levels of the partials

Question 30

how does an oscilloscope show amplitude changes?

Answer 30

vertical changes

Question 31

how does an oscilloscope show frequency changes?

Answer 31

more waves

Question 32

how does an spectrum analyzer show amplitude changes?

Answer 32

vertical changes

Question 33

how does an spectrum analyzer show frequency changes?

Answer 33

horizontal changes

Question 34

how does an sonogram show amplitude changes?

Answer 34

color

Question 35

how does an sonogram show frequency changes?

Answer 35

vertical changes

Question 36

what does signal flow start with?

Answer 36

sound source

Question 37

what is a microphone and what does it do?

Answer 37

an input transducer, converts sound pressure variations into voltage variation

Question 38

what are speakers or headphones what do they do?

Answer 38

output transducers, convert voltage variation into sound pressure variation

Question 39

what two components are part of audio interface?

Answer 39

a microphone preamp & an A/D converter