GENERAL

- "A-Weighing": weighing according to the A-curve, defined in Belgian standard IEC 61672-1;

- “A-weighed sound pressure level LpA”: the A-weighed instantaneous level of the sound pressure;

- “A-weighed equivalent continuous sound pressure level LAeq.T”: the constant A-weighed sound pressure level that during period T would cause the same noise energy as the actually measured A-weighed sound pressure level during the same period T;

- “A-weighed percentage level LANT”: the A-weighed sound pressure level that during N% of period T is exceeded;

- “stable noise”: noise of which the level fluctuations measured as LAeq,1s amount to no more than 5 dB(A);

- "intermittent noise": noise of which the level falls a multiple of times to that of the residual noise, and whereby the noise level during the increase continues for a period in the order of 2 seconds; the level increases are measured as LAeq,1s and have a total duration no longer than 10% of the duration of the assessment period(s) in question; 

- "fluctuating noise": noise of which the level constantly varies to a significant degree; the variations can be either periodic or non-periodic; the level increases are measured as LAeq,1s and have a total duration no longer than 10% of the assessment period(s) in question; 

- "pulsating noise": noise caused by very brief events, shorter than 2 seconds, and of which the level abruptly falls a number of times until reaching that of the residual noise or the original environmental noise; the level increases are measured as LAeq,1s and have a total duration no longer than 10% of the assessment period(s) in question; 

- "incidental noise": noise of which the level increases infrequently resulting from events with a duration longer than 2 seconds; the level increases are measured as LAeq,1s and have a total duration no longer than 10% of the duration of the assessment period(s) in question; 

- "tonal noise": noise of which the tonal nature is demonstrated in the frequency range of 50 Hz to 10,000 Hz by:

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either a linear third octave band analysis (value of a minimum of one third octave band at least 5 dB higher than the value of both adjacent third octave bands);

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or audibility and a narrow band analysis in 1/24 octave bands;

- “environmental noise”: the noise at a given place and at a given time; that applies both in open air and in a closed space;

- “relevant value”: the numerical value of the acoustic magnitude which represents the noise of an establishment or a part of it;

- “specific noise”: the relevant value which may be adapted with an assessment figure; also counted as the specific noise of an establishment is noise resulting from transport, loading and unloading activities, traffic, the warming up or running of engines on the premises of the establishment, as well as incoming and outgoing traffic;

- “residual noise”: noise that exists after the stopping or elimination of one or more specific sources of noise of an establishment which significantly contribute to the environmental noise;

- “original environmental noise”: environmental noise present before the operation or changing of an establishment;

- “assessment period”:

• daytime: the period from 7 a.m. to 7 p.m.;

• evening: the period from 7 p.m. to 10 p.m.;

• night: the period from 10 p.m. to 7 a.m.;

- “duration of measurement”: the total duration of a period in which the noise is actually measured;

- "period of measurement": not necessarily consecutive period which can include multiple measurements;

- "full acoustic investigation": investigation with the intention of obtaining an evaluation according to this Order of an acoustic situation on the basis of immission levels possibly supplemented by proposals for improvement;

- "limited acoustic investigation": investigation that only includes the technical inspection stated in Articles 37 to 56 of the Order of the Government of Flanders of 12 December 2008 implementing Title XVI of the Decree of 5 April 1995 concerning the general provisions related to environmental policy, and is carried out by or under the responsibility of the supervisors;

- “A-weighed maximum sound pressure level measured with the slow time weighing LAmax,slow”: the maximum A-weighed level of the sound pressure, measures with the slow (1 sec) time weighing characteristic S;

- “noise limiter”: a device designed to correct any overrun of a pre-set maximum noise level, either by completely stopping the production of music or by gradually capping the noise level;

- “music”: all forms of music emission, electronically amplified and forthcoming from permanent or temporary sources of noise;

- “musical activity”: any activity, whether or not classified, in which music is produced;

- “special occasion”: such as a fair, carnival, music festival, party, school celebration, annual celebration of an association, wedding, jubilee and other special celebrations and festivities. “.