Abstract
The on-site measurement system of low frequency noise (LFN) and annoyance
response to low-frequency noise have benn developed to find the reasons
why people suffer from environmental noise with low frequency componet.
The advantage of this system is that we can easily find the relationship
between complainants' subjective responses to acoustical events in
dwellings and their physical properties such as time trend and frequency
characteristics.
Measurements were conducted with the developed system in eight of
residential spaces and responses of complainants were also collected
using a switch box during measurements. The system is capable to
do FFT and 1/3 octave band analysis for five channels with enough
frequency resolution. Four analysis channels were used for interior
noise measurement and the rest was for outdoor measurement. Additional
sound level meter with real- time 1/3 octave band analyzer was also
used. Complainants were asked to operate switches when he/she detected
the beginning and the end of the target noise during the measurement.
This paper explains the developed system and an example of measurement
result.
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