SOUND INSULATION AT CONSTRUCTION STAGES
➢ Sound travels through the cracks that get left between the door and the wall.
➢ For reducing noise, this space (jamp frame gap) should be packed with the sound
absorbing material.
➢ Sound insulation can be constructing windows with double or triple panes of glass
and filling the gaps with the sound absorbing materials.
➢ Acoustical tiles, hair felt, perforated plywood etc can be fixed on walls, ceilings,
floors etc to reduce noise.
LEGISLATIVE MEASURE
➢ Strict legislative measures need to be enforced to curb the menace of noise pollution.
➢ Some of the measures are:
a) Minimum use of loudspeakers and amplifiers near silence zones.
b) Banning pressure horns in automobiles.
c) Framing a separate Noise Pollution Act.
MECHANISM OF HEARING
➢ Sound is a special kind of wave action is transmitted through air in the form of
pressure waves.
➢ These waves are received by hearing apparatus of animals and transformed into
electrical impulses in the ear and carried to the brain which enables us to hear.
➢ Sound waves are generated in a number of ways:
explosive expansion of gases
turbulent movement of liquids
vibrations of solid objects etc.
➢ The hearing machinery of our body consist of three parts:
the outer ear
middle ear
inner ear
➢ The outer ear comprises of two curled shells each on either side of the head and tissue
thin membrane.
➢ It is tightly stressed like drum- head, which lies in between the outer and middle ear.
➢ The middle ear consists of a hollow cavity enough to hold five or six drops of water.
➢ A set of three tiny bones, the hammer(malleus), anvil(incus), stirrups(stapes) span
across the empty space.
➢ At the end of the chain the handle of hammer is connected to eardrums while towards
the inner side stirrups are connected to another membrane, an oval window about this
size of a pin- head.
➢ This membrane separates the middle ear cavity from the fluids and canals which form
from the inner ear and control our sense of balance.
➢ Immersed in the fluid are numerous hair cells or ciliary cells lining the inner ear-
chamber.
➢ In the process of hearing sound waves are funnelled in ear canals, strike the ear
drums and make it vibrate.
➢ These vibrations travel along the bony chain to the oval window which transmit them
to the fluid in the inner ear.
➢ Sound travels through the cracks that get left between the door and the wall.
➢ For reducing noise, this space (jamp frame gap) should be packed with the sound
absorbing material.
➢ Sound insulation can be constructing windows with double or triple panes of glass
and filling the gaps with the sound absorbing materials.
➢ Acoustical tiles, hair felt, perforated plywood etc can be fixed on walls, ceilings,
floors etc to reduce noise.
LEGISLATIVE MEASURE
➢ Strict legislative measures need to be enforced to curb the menace of noise pollution.
➢ Some of the measures are:
a) Minimum use of loudspeakers and amplifiers near silence zones.
b) Banning pressure horns in automobiles.
c) Framing a separate Noise Pollution Act.
MECHANISM OF HEARING
➢ Sound is a special kind of wave action is transmitted through air in the form of
pressure waves.
➢ These waves are received by hearing apparatus of animals and transformed into
electrical impulses in the ear and carried to the brain which enables us to hear.
➢ Sound waves are generated in a number of ways:
explosive expansion of gases
turbulent movement of liquids
vibrations of solid objects etc.
➢ The hearing machinery of our body consist of three parts:
the outer ear
middle ear
inner ear
➢ The outer ear comprises of two curled shells each on either side of the head and tissue
thin membrane.
➢ It is tightly stressed like drum- head, which lies in between the outer and middle ear.
➢ The middle ear consists of a hollow cavity enough to hold five or six drops of water.
➢ A set of three tiny bones, the hammer(malleus), anvil(incus), stirrups(stapes) span
across the empty space.
➢ At the end of the chain the handle of hammer is connected to eardrums while towards
the inner side stirrups are connected to another membrane, an oval window about this
size of a pin- head.
➢ This membrane separates the middle ear cavity from the fluids and canals which form
from the inner ear and control our sense of balance.
➢ Immersed in the fluid are numerous hair cells or ciliary cells lining the inner ear-
chamber.
➢ In the process of hearing sound waves are funnelled in ear canals, strike the ear
drums and make it vibrate.
➢ These vibrations travel along the bony chain to the oval window which transmit them
to the fluid in the inner ear.
