02 - ROOM ACOUSTICS AND ACOUSTICAL DEFECTS

echo

is produced when the

reflected sound wave reaches the ear

just when the original sound from the

same source has been already heard.

Thus there is repetition of sound.

Reverberation

is the persistence of sound in the enclosed space , after

the source of sound has stopped.

Prolonged Reverberation

long reverberation time (RT) due to large amounts of

highly reflective surfaces and/or to large volume of space which will take

considerable time for reflected sound to die out.

blurring

Effect of prolonged

reverberation is _____-

which is harmful to both

speech and music.

reverberation time

The time during which the sound persists is called the ________of sound

in the hall.

Flutter Echoes

is a rapid but repetitive succession of sounds caused by highly

reflective parallel surfaces (wall to wall, or ceiling to floor).

Undue focused sound

is caused by concave surfaces which causes sound to

converge at certain points with resulting loss of energy in other parts of the room.

FOCUSED SOUND

The shape of the hall makes sound waves to concentrate in some particular areas of

hall creating a sound of large quality.These spots are called???

Audible Resonance

the emphasis of sound energy at a particular frequency. This means that

there is an excessive sound level at one frequency in one location in the room and there is a

dearth of sound level at one frequency in another location in the room.

The effect would be to emphasize certain frequencies at the expense of others, which is

undesirable for balance desired in rooms intended for music.

External noises

noises from vehicles, traffic engines, factories, machines etc. may enter the hall either

through the openings or even through walls and other structural elements having improper

sound insulation.