Überschlägige Geräuschprognose -  ? Overview:
The rough noise forecast provides a simple calculation method of noise immissions in accordance with TA noise. Six main windows are used. The data independent of the immission points is entered in the window EMISSION. The other five windows are provided for five (in the window calculation > preparation) selectable immission points. You can perform the calculation of coordinates or simply over distances.

Preparation:
Please, select the window calculation > preparation. Enter the name of the immission sites (E.g. IO1: road 14) and the height. If you want to calculate coordinates, specify the scale factor (usually a 1 if your details are provided in m). Reporting period: for the calculation of the night: 1 (loudest time at night) or 8 for the entire night, for the time of day: 16.
 ? Data independent of the immission points is entered in the window of EMISSION:


No.
A numbering of the emission sources is not required. Optionally, this column can be used to calculate a subtotal or a total sum of all noise sources.
Enter the following abbreviation:
ZS: Intermediate-sum
GS: Total
ZS defines that a total level of the last ZS (or of the table top respectively) until this ZS is to be calculated. GS is generally used to display the total amount of all noise sources. This GS is placed at the end of the table. Should there be more than one GS in the table, then the system will sum up from each GS to the next one.

Comment
Here, a description of the emission sources can be made.

Emission
Enter the measured values into this column from which the sound power level should be calculated. In case you do already have sound power levels available, then please enter those here as well. Readings can be, e.g. interior level, sound pressure level at a certain distance, sound pressure level on a measurement surface.
Example 1: A motor was measured at a distance of 3 m. The reading was 90 dB(A). Type: 90 in column emission, 3 in column Bez.-Abst. - from this input the program calculates the sound power level.
Example 2: The sound radiation pattern of a window with a surface area of 20 square meters is to be calculated. In the hall you have measured 85 dB(A) Type: 85 in column of emission, 20 in column Meßfl. (S). Now please also enter the sound proofing in column R'w a (E.g. 34 dB)


REF. tune
Entries in the column Reference Distance will be converted according to a hemisphere radiation on the sound power level. Please note that this calculation should be made only for sources which are nearly considered point sources. A correction for a deviation from the hemisphere radiation during the measurement can be taken into account by entry in the subsequent column num. Add-on.

NUM. Add-on.
The values in this column will be added up. If you want to subtract values, you can enter here negative numbers. You can use the column for any type of corrections (e.g. microphone correction).

Measuring surface
If the value entered in column emission is a medium sound pressure level identified on a measurement surface, then the measuring surface is entered here. In case the sound power levels of a noise radiating part (from the internal level) is to be calculated, then the surface of the part has to be entered.

R'w + 4
The weighted sound reduction index is being substracted. The 4 dB or 6 dB respectively, for the transition into the free field must be included in the input value.

Inhabitants-T
If a temporal assessment of an emission source is to be done, then a reaction time has to be entered. The deduction for the time rating is calculated from this entry and the assessment period specified in the window of Preparation. Reaction times below 1 minute (more specifically below 1/100 h) can be entered as follows: in case the value is preceded by a minus sign, then the number is multiplied by 100 and it is interpreted as seconds.
Example: 1.45 => 145 s.09 => 9 s

Ko
The space angle dimension is added. Typical values are 3 dB for a source that stands on the ground or 6 dB for a radiating building wall.

hQ
Height of the noise source above base level.

Coordinates x-Q, y-Q
In case an M Factor is entered in the window VORBEREITUNG, then coordinates are expected in these columns. Distances (three-dimensional) are calculated from the coordinates of the IP and the sources.

LwAeq
The calculated sound power level of the noise source: For the calculation of the nighttime: 1 (loudest hour of night) or 8 for the entire night, for day time: 16.