About Transmission
Loss
Transmission loss expressed in decibel (dB)
shows the degree of sound that has reduced
as it transmits a glass pane.As for sound
quality expressed in hertz (Hz), the most
audible range of human hearing is from 1000
to 4000Hz.
As shown in the left figure, the transmission
losses at 2000Hz are:
35dB for nomal laminated glass, and
40dB for sound control laminated glass.
The transmission loss of the sound control
glass is 5dB higher than the normal glass.
Where a sound level is 83dB (the same level
of the inside of a train), the effect that
this 5dB of transmission loss has is as
in follow.
No transmission loss --> 38dB at a
point 90m apart from the sound source (same
level of a midnight residential area)
5dB of transmission loss --> 38dB at
a point 45m apart from the sound source
(same level of a midnight residential area)
The above proves that 5dB of transmission
loss is fairly effective for sound reduction.
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