Acoustics

Question 1

Acoustics

Answer 1

the qualities and characteristics of sound waves

Question 2

Acoustic Production

Answer 2

How sound is generated

Question 3

Acoustic Propagation

Answer 3

How sound moves through and is affected by its environment

Question 4

Acoustic Control

Answer 4

How sound can be prevented from entering or leaving space

Question 5

Acoustic Interaction

Answer 5

What happens to sound energy when it encounters a boundary

Question 6

Your perception in Acoustics

Answer 6

How sound is processed by your ear and brain

Question 7

Direction Sound Energy moves from a Source

Answer 7

All directions

Question 8

The Law of Conservation of Energy

Answer 8

total energy is neither increased nor decreased in any process

Question 9

sound energy encounters a surface (3)

Answer 9

Reflection
Absorption
Transmission

Question 10

Sound Energy Reflection

Answer 10

Energy sent back into a room

Question 11

Sound Energy Absorption

Answer 11

Energy captured by a medium (converted into heat)

Question 12

Sound Energy Transmission

Answer 12

Energy passing through a medium

Question 13

Specular Reflections (2)

Answer 13

• bounce directly off a surface

- the incoming angle will equal the outgoing angle

Question 14

Flutter Echoes

Answer 14

a series of reflections that continue to bounce back and forth between parallel hard surfaces

Question 15

Characteristics of Reflected Energy

Answer 15

• wavelengths will react one way or another when reflected determined by the size, material, and mass of the boundaries of the space

Question 16

echo

Answer 16

A “late” reflection

Question 17

Reverberation

Answer 17

numerous, persistent reflections

Question 18

True Reverberation

Answer 18

a phenomenon seen in larger rooms with many hard reflective surfaces

Question 19

Absorption characteristic

Answer 19

The materials used in the construction play a part in the amount of sound energy absorption

Question 20

porous absorber

Answer 20

• material of the absorber slows the molecules down

- there may still be some reflected sound while a much greater portion of the sound has otherwise been absorbed

Question 21

Transmission characterisics (2)

Answer 21

• When sound is absorbed, it doesn’t just go away

- It may be converted to heat, or it may be transmitted through the absorbent material to an adjoining space

Question 22

Ambient Noise

Answer 22

any sound other than the desired signal

Question 23

Direct sound and reflected energy

Answer 23

you will always have the direct sound – the sound that arrives at the listener position in a direct, straight line from the source to the listener, and the reflected sound – the sound that takes any indirect path from the source to the listener