Measurements

“Noise cannot be measured – but sound!”

Almost everything can be measured – except for situations that existed in the past or are likely to occur in the future. Therefore, measurements can only provide insight with respect to the situation that exists at the time at which the values are measured.

Measurements can only help to verify whether a prediction was correct or if an immission guide value is exceeded. However, measurements (of, for instance, the final rehearsal for an open air concert) can also create a basis for a prognosis (for the actual concert).

LÄRMKONTOR GmbH is a certified agency in accordance with §29b BImSchG for the Test Range Group V – Assessment of Sounds.

Sound level measurements

LÄRMKONTOR GmbH measures sound immissions and emissions from all types of sound sources. This includes the entire range of types of environmental noise, work place noise as well as sound emissions from appliances, machines and facilities. Furthermore, we conduct measurements in the areas of building and room acoustics.

Construction noise

In order to capture the sound situation during the construction we conduct individual as well as long-term measurements ( Noise monitoring). The measurements in combination with the sounds that are recorded at the same time allow for an evaluation of the situation in retrospect, for instance with regard to complaints. It is possible to regularly transfer the measurement results directly to the clients.

Furthermore, we devise acoustic prognoses regarding construction noise and offer consulting services.

Industrial and commercial noise

We measure noise levels generated by commercial and industrial enterprises in order to determine emissions, to identify the immissions in surrounding areas and also to verify acoustic forecasts. The emissions of single machines, parts of facilities or operating procedures as well as of entire facilities and operations are determined.

Noise caused by event noise

It is not always possible to predict the sound immissions generated at events with sufficient exactness. Therefore, we conduct sound level measurements during rehearsals in order to determine the immissions in the neighborhood. The findings derived from that can be used as a basis to take measures prior to the start of the event to comply with immission guide values and to avoid complaints.

Pubs & Clubs – leveling limiters

We conduct measurements to check sound systems and also within the neighborhood for gastronomic businesses, discotheques and clubs. This also includes the leveling of limiters in order to comply with prescribed levels.

Building and room acoustic measurements

It is the purpose of building and room acoustics to ensure that the sound level within a room is reduced and that it is possible to utilize the room without limitations from a sonic perspective. Living and work spaces, but also rooms in schools or hospitals have to be protected appropriately from external noise. The same applies to noise coming from adjacent rooms or from facilities such as elevators, air conditioning and ventilation units.

The sound level that is generated within the room itself may also have to be mitigated under certain circumstances. It is important to ensure that, depending on the utilization of that room, the required speech intelligibility is achieved.

Measuring airborne and footfall noise

Living and habitable spaces are to be protected from noise from adjacent rooms (e.g. a restaurant on the ground floor) in a suitable fashion.

However, there are also rooms in which confidential matters are to be discussed. Their sonic design specifically has to ensure that conversations cannot be heard outside the room.

In such cases, LÄRMKONTOR GmbH conducts airborne and footfall noise measurements on ceilings and dividing walls in accordance with relevant guidelines and regulations. The results help to determine whether the building components meet noise protection standards or if measures that have been taken have actually brought about an improvement.

Measuring reverberation time

The reverberation time is one of the most well-known key factors with regard to room acoustics. It is defined as the time interval within which the sound pressure in a room is reduced by 60dB after the sound source has suddenly gone silent. LÄRMKONTOR GmbH measures the reverberation time and develops proposals on how to improve speech intelligibility within the rooms in question.

Road surfaces

Road pavement is becoming increasingly significant when it comes to reducing the noise of road traffic. Whereas open porous asphalt to mitigate noise on roads outside cities and towns has already been established for roads on which vehicles are driven with a higher speed, noise-reducing asphalts for roads within the city are now being tested more intensively.

The calculation regulations for road traffic noise (e.g. RLS, VBUS) prescribe additions for certain road surfaces. New types of paving can only be introduced if their acoustic properties have been measured and evaluated under realistic conditions. In order to determine these sound emissions from road surfaces, LÄRMKONTOR GmbH applies the “Statistical Pass-By Procedure / SPB measurement).

Noise monitoring

Noise monitoring can be utilized in order to ensure compliance with threshold and guideline values. This may be the case in connection with inner-city building projects as well as with the expansion or new construction of roads. Measurements do not only document the potential exceedance, but may also be helpful when it comes to showing that regulations are met by the building activities in the case of complaints. An audio recording usually allows for an exact allocation of incidents of noise to individual sources.

LÄRMKONTOR GmbH conducts continual measurements and provides the required documentation of incidents, e.g. in monthly reports, and also offers the automated preparation of data regarding the measurement results.

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