noisestop systems singapore soundproofing - hdb flats, houses, karaoke, office & much more...
Information For Soundproofing
pollution is not easily defined. Part of the difficulty lies
in the fact that in some ways it is different from other
forms of pollution.
Frequency & Acoustic Performance information
Frequency (eg.bass sound from a speaker)
Frequency (eg.bass sound associated with beat noise)
Frequency (e.g sound of a car door closing)
Frequency (e.g vocal noise)
Frequency (e.g. vocal noise)
Frequency (e.g. screaming)
used in sound proofing:
walls or partitions, solid fences, earth mounds, earth berms,
buildings, etc used to reduce noise, without eliminating it.
refers to noise which is fundamentally transmitted by way of
the air and can be attenuated by the use of barriers and walls
placed physically between the noise and receiver.
totally encompassing sound in a given situation at a given
time, usually composed of sound from all sources near and far.
period in a day over which assessments are made.
point at which noise measurements are taken or estimated.
limits of frequency which are audible or heard as sound. The
normal ear in young adults detects sound having frequencies
in the region 20 Hz to 20 kHz, although it is possible for
some people to detect frequencies outside these limits.
noise is the term used to describe the noise measured in the
absence of the noise under investigation. It is described as
the average of the minimum noise levels measured on a sound
level meter and is measured statistically as the A-weighted
noise level exceeded for ninety percent of a sample period.
This is represented as the L90 noise level (see below).
barrier", a solid object used to attenuate sound.
total of the qualities making up the individuality of the noise.
The pitch or shape of a sound's frequency content (spectrum)
dictate a sound's character.
level of noise is measured objectively using a Sound Level
Meter. This instrument has been specifically developed to mimic
the operation of the human ear. The human ear responds to minute
pressure variations in the air. These pressure variations can
be likened to the ripples on the surface of water but of course
cannot be seen. The pressure variations in the air cause the
eardrum to vibrate and this is heard as sound in the brain.
The stronger the pressure variations, the louder the sound
range of pressure variations associated with everyday living
may span over a range of a million to one. On the top range
may be the sound of a jet engine and on the bottom of the
range may be the sound of a pin dropping.
of expressing pressure in units ranging from a million
to one, it is found convenient to condense this range to
a scale 0 to 120 and give it the units of decibels. The
following are examples of the decibel readings of every
ear is not as effective in hearing low frequency sounds as
it is hearing high frequency sounds. That is, low frequency
sounds of the same dB level are not heard as loud as high frequency
sounds. The sound level meter replicates the human response
of the ear by using an electronic filter which is called the "A" filter.
A sound level measured with this filter switched on is denoted
as dB(A). Practically all noise is measured using the A filter.
The sound pressure level in dB(A) gives a close indication
of the subjective loudness of the noise.
distortion around solid obstacles of waves traveling past.
that varies continuously and to an appreciable extent over
the period of observation. It can also include intermittent
noise. As a guide, when the level varies noticeably by more
than 5 dB over a period of less than one minute, the noise
is considered to be fluctuating.
is synonymous to pitch. Sounds have a pitch which is peculiar
to the nature of the sound generator. For example, the sound
of a tiny bell has a high pitch and the sound of a bass drum
has a low pitch. Frequency or pitch can be measured on a scale
in units of Hertz or Hz.
vehicles are assumed to be buses, rigid trucks and semi trailer
trucks with a tare weight greater than 3 tonnes. Also heavy
vehicles can be defined in terms of length as buses, or trucks
with a length exceeding 5.25 meters.
a high peak of short duration or a sequence of such peaks.
A sequence of impulses in rapid succession is termed repetitive
level suddenly drops to that of the background noise several
times during the period of observation. The time during which
the noise remains at levels different from that of the ambient
is one second or more.
noise varies with time, a single noise value cannot adequately
define the noise ambient. For this reason, the acoustic environment
is described using a number of noise level descriptors as follows;
sound pressure level that is exceeded for 1% of the time for
which the given sound is measured.
sound pressure level that is exceeded for 10% of the time for
which the given sound is measured.
arithmetic average of the L10(1hr) levels for the 18 hour period
between 6am and 12 midnight on a normal working day. It was
a common traffic noise descriptor. For traffic noise it is
usually about 3dB(A) higher than Leq (24 hours).
level of noise exceeded for 90% of the time. The bottom 10%
of the sample is the L90 noise level expressed in units of
sound pressure level - the steady sound level that, over a
specified period of time, would produce the same energy equivalence
as the fluctuating sound level actually occurring.
Leq noise level for a specific one-hour period.
continuous noise level during any one hour period between 10pm
Leq noise level for the period 10pm to 7am.
Leq noise level for the period 7am to 10pm.
equivalent continuous noise level during a 24 hour period,
usually from midnight to midnight.
rise of 10 dB in sound level corresponds approximately to a
doubling of subjective loudness. That is, a sound of 85 dB
is twice as loud as a sound of 75 dB which is twice as loud
as a sound of 65 dB and so on. That is, the sound of 85 dB
is 400% times the loudness of a sound of 65 dB.
major components within the low frequency range (20Hz - 250Hz)
of the frequency spectrum.
innate or essential quality of the noise. That which makes
one noise distinguishable from another (e.g. the spoken voice
from the sound of a dog barking, a telephone ringing from the
sound of a gun).
wave changed in direction of propagation due to a solid object
obscuring its path.
ability of a material to absorb sound energy through its conversion
into thermal energy.
instrument consisting of a microphone, amplifier and indicating
device, having a declared performance and designed to measure
sound pressure levels.
level of noise, usually expressed in decibels, as measured
by a standard sound level meter with a microphone.
times the logarithm to the base 10 of the ratio of the sound
power of the source to the reference sound power.
Transmission Class. This is a measure of the extent of sound
reduction of noise going through a building element, presented
as a rating or class. It denotes the sound attenuation properties
of walls, floors and ceilings used to construct building spaces.
The higher the STC the better the sound reducing performance
of the construction.
refers to noise which is generated by vibrations induced in
the ground and/or structure. These vibrations excite walls
and slabs in buildings and cause them to radiate noise. This
type of noise can not be attenuated by barriers or walls but
requires the interposition of a resilient (neoprene, springs
etc.) break between the source and the receiver.
a prominent frequency and characterized by a definite pitch.
DFB - Dense Fibre Block
Dense Fibre Block, is a type of mineral glass wool fiber products, it can be used in many applications for soundproofing. Please be aware that the lower the density of this product the less effective in soundproofing and the more effective in heat retention. Anything under 80kg density is not recomended.
Acoustic Wall Panels
directly surface-mounted to wall or ideally in conjunction
Acoustic Ceiling Panels
directly surface-mounted to ceiling or ideally in conjunction
Stop Systems Singapore
NoiseStop Systems is the generic name given to a certain
range of product