Chapter 2

Question 0

What is trough?

Answer 0

The lowest point of energy

Question 1

What is peak?

Answer 1

The highest point of energy

Single instant in time

Question 2

What is a node?

Answer 2

No energy

Negative energy

Question 3

Wavelength

Answer 3

Measure of one wave cycle

Question 4

Amplitude

Answer 4

Measure of energy in a sound wave

Question 5

Period

Answer 5

The time it takes for one cycle

Measure in seconds

Question 6

Frequency

Answer 6

The wave cycles per second

Question 7

Phase

Answer 7

The time delay between two similar wave forms

Question 8

Simple Wave

Answer 8

Pure tones, repetitive shape, symatrical

Question 9

Complex Wave

Answer 9

Combination of purse tones and harmonics

Overtones, harmonics, irregular shape

Question 10

Envelope

Answer 10

The volume profile of a sound

Question 11

Decibel

Answer 11

The relationship between measure level and reference level

Question 12

What is the velocity of sound in standard conditions?

Answer 12

1130 feet per second

344 m/sec

Question 13

What happens when two similar sound waves are combined in phase?

Answer 13

They add together and get louder

Question 14

What happens when two similar sound waves are combined out of phase?

Answer 14

The cancel each other out

Question 15

What are the four parts of a wave’s envelope?

Answer 15

Attack
Decay
Sustain
Release

Question 16

Attack means…

Answer 16

Time it takes to hit the highest peak

Question 17

Decay means…

Answer 17

Time it takes to go from attack to sustain

Question 18

Sustain means…

Answer 18

The level in which the sound is held out

Question 19

Release means…

Answer 19

The time it takes to fade out

Question 20

What is masking and when does it occur??

Answer 20

Masking happens when there are two sounds with similar frequency content are played together. If one is louder then the other, only the louder one is heard

Question 21

What is dB SPL?

Answer 21

Sound pressure level which is the energy of sound in air

Question 22

What is dB V?

Answer 22

Voltage which is the energy of electrical signal

Question 23

What is dB M?

Answer 23

Power which is the output power of an amplifier

Question 24

What is direct sound?

Answer 24

Sound that travels directly from the source to the listener

Question 25

What is early reflection?

Answer 25

The sound reflects once before reaching the listener. | anywhere from 20ms to 50ms

Question 26

What is reverberation?

Answer 26

The sound that reflects multiple times before reaching the listener Anywhere after 50ms

Question 27

What do the Fletcher-Munson equal loudness curves tell us??

Answer 27

Hearing is not linear and what goes in your ear is not what you actually hear

Question 28

Frequency is measured in...

Answer 28

Hertz (hz)

Question 29

Amplitude is measured in...

Answer 29

Decibel (dB)

Question 30

What is the equation for wavelength...

Answer 30

Wavelength = velocity/frequency

Question 31

Auditory perception is...

Answer 31

How we hear

Question 32

What is the reference level for dB SPL?

Answer 32

0.0002microbar

Question 33

What is the reference level for dB V?

Answer 33

0.775volts

Question 34

What is the reference level for dB M?

Answer 34

1 milliwatt