I want to present my new Reverberation time calculator.
Calculation is performed in accordance with Eyring's formula:
T (sec) = 0,163*V / (-ln(1-a)*S + 4*µ*V)
V – volume of the room, m3
S – total surface area of the room, m2
a - average absorption coefficient of room surfaces
µ - coefficient which takes account of attenuation of sound in air
Calculations can be performed for rooms for different purposes. Keep in mind diffuse sound field limitation of calculations accuracy for a small spaces.
Besides using internal database of absorbers, the program allows to enter sound absorption coefficients of any arbitrary materials taken from reference books.
Calculated value of reverberation time is graphically compared to recommended (optimum) values are in compliance with international standards:
DIN 18041 Acoustical quality in small to medium-sized rooms, 2004
EBU Tech. 3276 – Listening conditions for sound programme, 2004
IEC 60268-13 (2nd edition) Sound system equipment - Part 13, 1998
There is a possibility to create report of calculation results in PDF format.
Just choose Standard, room type, enter room dimensions, enter properties of internal surfaces.
Programm automatically calculate optimum T60 for the rooom. Tolerance limits for Topt will shown on diagramm.
You can add absorbers from internal database (or from another sourse).
Calculator description available at the link Calculator Reverberation time
Direct link to calculator http://www.acoustic.ua/forms/Reverberation-RT60.html
Direct link to sound absorption coefficients of common materials table http://www.acoustic.ua/st/web_absorption_data_eng.pdf
More on-line acoustic calculators on the web page http://www.acoustic.ua/recommendations/800
If you have any questions, please let me know