Sound Design

Calculations Database

Calculations Database

The Calculations Database contains a range of individual corrections and full calculations used regularly by acoustics consultants. There are loads of corrections and calcs in the database, with some of the main ones shown below.

ISO 9613 Calculation

Part of the Environmental Toolbox, this calculation contains a basic ISO 9613 calculation. The calculation takes account of geometrical divergence, atmospheric attenuation, ground attenuation and barrier attenuation.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

CRTN Calc

Part of the Environmental Toolbox, this implements a Calculation of Road Traffic Noise (CRTN) calculation using the procedure described in The Department of Transport Calculation of Road Traffic Noise.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

CRN Calc

Part of the Environmental Toolbox, this implements a Calculation of Railway Noise (CRN) calculation using the procedure described in The Department of Transport Calculation of Railway Noise 1995. This includes the corrections given in CRN, and the additional values produced by DEFRA in 2007.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

BS 8233 Break-In Calc

Part of the Sound Insulation Toolbox, this contains a calculation of noise break-in from free-field noise levels at the location of the facade based on the input dimensions and selected materials. It is based on equn. 1 from section 6.7.2.1 of BS8233 1999.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

EN 12354-4 Simple Break-Out

Part of the Sound Insulation Toolbox, this calculates sound pressure at receiver location based on the simplified model given in Annex E of EN 12354-4 to a receiver in line with the centre of the radiating surface.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

Noise Transfer

Part of the Sound Insulation Toolbox, the Rev to Rev and Rev to Direct calculations calculate the amount of noise transferred from one space to an adjacent space. The Rev to Rev calc calculates the transfer of reverberant sound pressure levels from one reverberant space to another. The Rev to Direct calc calculates the transfer of reverberant sound pressure in the source room to the direct field of the receive room.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

Fan Noise - Atmos Side

Part of the Building Services Toolbox, this contains a basic calculation of noise from a fan to an external receiver location. Includes duct loss, bend loss, end reflection, directivity, correction for off-axis, radiation, distance, screening and facade incidence.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

Fan Noise - Room Side

Part of the Building Services Toolbox, the room-side fan noise calcs contains basic calculations of noise from a fan to an internal receivers. Three calcs are included, one direct to the room being served which includes general system losses along with the corrections required to calculate the direct and reverberant components in the receive rooms, one to calculate break-out from duct work travelling through a room, and one to calculate to multiple receivers and break-out locations.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

Basic Crosstalk Calc

Part of the Building Services Toolbox, this contains a basic calculation of the resulting level difference across a separating element as a result of noise travelling through the partition separating and the ductwork serving the adjacent rooms.

Click the Image to the right to see the relevant entry in the On-Line Calculations Database Reference Guide.

Download the Calculations Database

Click on the image to the right to download the Calculations Database. If you need any help loading the database within Sound Design, see the Database section of the User Guide.

Please remember that by downloading and using Sound Design, you must agree to the End User License Agreement (link further down the page).

On-Line Reference Guide

Click the image to the right to go to the on-line Calculations Database Reference Guide.

Calculations Database Reference Guide

Download a pdf of the Calculations Database Reference Guide by clicking on the image to the right.