Architectural Acoustics Recorded Lecture

Question 1

deals with the production, control, transmission, reception, and effects of sound. In interior design, we are concerned with the control of sound in interior spaces

Answer 1

ACOUSTICS

Question 2

occur in large spaces when surfaces reflect sound waves that are loud enough and received late enough to be perceived
as distinct from the source. In smaller rooms, parallel reflective surfaces can cause a rapid succession of echoes we call flutter.

Answer 2

ECHOES

Question 3

refers to the persistence of a sound within a space, caused by multiple reflections of the sound after its source has stopped.

Answer 3

REVERBERATION

Question 4

the sound level at the listener’s ear, above the background noise level.

Answer 4

SIGNAL-TO-NOISE RATIO (SNR)

Question 5

surfaces can cause echoes and flutter.

Answer 5

PARALLEL REFLECTIVE

Question 6

can help diffuse sound.

Answer 6

SPLAYED SURFACES

Question 7

focus sound; convex surfaces diffuse sound

Answer 7

CONCAVE SURFACES

Question 8

is a unit expressing the relative pressure or intensity of sounds on a uniform scale, from 0 for the least perceptible sound to about 130 for the average threshold of
pain.

Answer 8

DECIBEL (dB)

Question 9

We refer to unwanted, annoying, or discordant sounds

Answer 9

NOISE

Question 10

refers to the perceived difference in sound levels between two enclosed spaces

Answer 10

NOISE REDUCTION

Question 11

is a measure of the performance of
a building material or construction assembly in preventing the transmission of airborne sound.

Answer 11

TRANSMISSION LOSS (TL)

Question 12

the heavier and more dense a body, the
greater is its resistance to sound transmission

Answer 12

MASS

Question 13

Introducing air spaces into the
construction assembly disrupts the path through which sound may be transmitted from one space to another

Answer 13

SEPARATION INTO LAYERS

Question 14

Absorptive materials help to dissipate
sound in a room.

Answer 14

ABSORPTION

Question 15

rating is a single number that combines TL values from many frequencies.

Answer 15

SOUND TRANSMISSION CLASS (STC)

Question 16

Is the totality of all sounds within the room when the room is unoccupied.

Answer 16

AMBIENT or BACKGROUND NOISE LEVEL

Question 17

The Angle of Incidence is equal to the angle of?

Answer 17

REFLECTANCE

Question 18

Splayed surfaces can help ______ sound.

Answer 18

DIFFUSE

Question 19

STC rating of an 8’’ brick masonry wall with metal ties.

Answer 19

52

Question 20

Sound absorption coefficient of Carpet for a 4 kHz octave band frequency.

Answer 20

0.45

Question 21

If the signal at listener’s ear is 65 dB and the background noise is 50 dB, what value is the SNR?

Answer 21

+15 dB

Question 22

The sound level at the listener’s ear above the background noise level.

Answer 22

SIGNAL TO NOISE RATIO