LFN and the A-Weighting

Sloven, Piet

doi:10.1260/026309205775374389

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…When the whole frequency range is measured and a single number is desired, it would be convenient perhaps to give both the C-and the A-weighted levels. The difference between the measured SPL applying both networks, L C -L A , has been used with relatively good success as an indicator to evaluate the amount of low frequency noise in a certain noise situation [19]. A measurement method, however, does not necessarily define how the results should be interpreted, nor what the target values should be.…”

Section: Discussionmentioning

confidence: 99%

“…a reference curve and a single number, were available when the measured data are compared against national regulations. It is well known that the A-weighting network is not adequate when low frequencies are of interest [19]; neither the C-nor the Z-weighting network is suitable to express the experienced noise. When the whole frequency range is measured and a single number is desired, it would be convenient perhaps to give both the C-and the A-weighted levels.…”

Section: Discussionmentioning

confidence: 99%

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Questionnaire about Low Frequency Noise Measurements in Rooms

Oliva

2012

Journal of Low Frequency Noise, Vibration and Active Control

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Room modes at low frequencies generate large sound pressure level differences within enclosures. The resulting sound field is complicated and the sound pressure level measurements become very uncertain. Consequently, the measurements of environmental noise in dwellings, of occupational noise exposure, and of sound insulation of façades, are not accurate at low frequencies. A special measurement methodology exists in a few countries. Measurement methods aim to be accurate and reliable, but they can not determine, at the same time, both the existing and the experienced sound field. A questionnaire was created to gather opinions on how measurements should be performed from several experts with experience in low frequency noise measurements in rooms. Twenty-three experts took part in this survey. The results from the questionnaire are presented in this paper. Most participants considered it necessary to standardize a reliable measurement method, but there was no unanimity about what the method should be. The most controversial points of discussion were the locations where the measurements should be taken, and how the measured data should be analyzed. A brief discussion of these points is presented.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Questionnaire about Low Frequency Noise Measurements in Rooms

Oliva

2012

Journal of Low Frequency Noise, Vibration and Active Control

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“…Audible tonal. low frequent 7 and impulsive components in noise increase the calculated or measured value M in dB(A) with punishments P (5 to 12 dB(A)) resulting in a value of judgement J = M + P to compare with standards. Also the differences of annoyance of the time of the day are incorporated.…”

Section: B Decibels Of Annoyancementioning

confidence: 99%

Environmental Noise Caused by Building Activities

SLOVEN

2023

8th European Conference on Noise Control 2009

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In The Netherlands regulations on noise of many kinds of traffic , industry, shootingranges, restaurants & bars, events are in force. Although noise originating from building sites is experienced as very bothersome there is no clear and no all-over system to limit that noise. Nowadays there is a strong movement to improve this situation. This contribution gives the backgrounds and insight in the Dutch situation. An interconnected system usable to municipalities is proposed. Means to limit the annoyance are handed over. Generally spoken an expected new system forces co-operation between contractors and authorities and make them more conscious. High levels are only admitted in situations in which authorities can argue why it is not not reasonable to ask contractors for extra reductions. However there will rest enough situations in which extreme limits are exceeded and inhabitants get the offer to leave their houses.

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“…Sometimes with contributions of the higher components (audio lfn, octaves 125 and 250 Hz). In those cases the A-weighted decibels give a wrong picture of the annoyance 1 . Measurements inside houses in presence of 'the noise' made clear there was not a dominant infra or centre lfn and A-weighted levels were low.…”

Section: Westward Rotterdam-port Areamentioning

confidence: 99%

Noise in the Spotlights. Research on Noise Coming From Remote Rotterdam-Port Areas

SLOVEN

2023

8th European Conference on Noise Control 2009

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In The Netherlands noise limits obstruct expansions. Just a few extra decibels became important and there is a concern on growing noise effects. Investigations on strange noise originating from Rotterdam-harbours far away are executed. Meteorological-favourable circumstances -mfc's -stimulate an other propagation of sound. Changing the character of emitted noise into more low frequent sounds by the phenomena of relative spectral shift, rss. A unique combination of organisations worked together to examine the several aspects. Three years of investigations, measurements, modelling and proposals have resulted in knowledge of sensitivity of sound propagation. It turned out that one simple solution to diminish the nuisance is not possible. A way to limit the annoyance is shown.

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LFN and the A-Weighting

Cited by 6 publications

References 8 publications

Questionnaire about Low Frequency Noise Measurements in Rooms

Questionnaire about Low Frequency Noise Measurements in Rooms

Environmental Noise Caused by Building Activities

Noise in the Spotlights. Research on Noise Coming From Remote Rotterdam-Port Areas

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