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Flashcards in Chapter 2 Deck (35)
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What is peak?

The highest point of energy
Single instant in time

1

What is trough?

The lowest point of energy

2

What is a node?

No energy
Negative energy

3

Wavelength

Measure of one wave cycle

4

Amplitude

Measure of energy in a sound wave

5

Period

The time it takes for one cycle
Measure in seconds

6

Frequency

The wave cycles per second

7

Phase

The time delay between two similar wave forms

8

Simple Wave

Pure tones, repetitive shape, symatrical

9

Complex Wave

Combination of purse tones and harmonics
Overtones, harmonics, irregular shape

10

Envelope

The volume profile of a sound

11

Decibel

The relationship between measure level and reference level

12

What is the velocity of sound in standard conditions?

1130 feet per second
344 m/sec

13

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

They add together and get louder

14

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

The cancel each other out

15

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

Attack
Decay
Sustain
Release

16

Attack means...

Time it takes to hit the highest peak

17

Decay means...

Time it takes to go from attack to sustain

18

Sustain means...

The level in which the sound is held out

19

Release means...

The time it takes to fade out

20

What is masking and when does it occur??

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

21

What is dB SPL?

Sound pressure level which is the energy of sound in air

22

What is dB V?

Voltage which is the energy of electrical signal

23

What is dB M?

Power which is the output power of an amplifier

24

What is direct sound?

Sound that travels directly from the source to the listener

25

What is early reflection?

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

26

What is reverberation?

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

27

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

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

28

Frequency is measured in...

Hertz (hz)

29

Amplitude is measured in...

Decibel (dB)

30

What is the equation for wavelength...

Wavelength = velocity/frequency

31

Auditory perception is...

How we hear

32

What is the reference level for dB SPL?

0.0002microbar

33

What is the reference level for dB V?

0.775volts

34

What is the reference level for dB M?

1 milliwatt