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The management of acoustics within indoor spaces that re designed for human occupation is very important. The spaces must be designed so that important sounds (such as speech, music or announcements) can be heard clearly or coherently. In spacious rooms such as auditoria, concert halls, lecture theatres, large meeting rooms (such as parliament), restaurants and public arenas, acoustic performance is very important.
The most critical performance criterion is the room’s reverberation time. The reverberation time is measured in seconds and relates to the time it takes for acoustic energy within the room to decay.
There exists recommended reverberation time for various types of room. These are specified in:
Australian / New Zealand standard AN/NZS 2107:2000 Acoustics – Recommended design sound levels and reverberation times for building interiors (available online from the library here).
2. The challenge
Your team needs to develop and validate a (computer) tool to evaluate the reverberation time of indoor spaces.
The reverberation time will need to be evaluated for each octave band within the normal human hearing range as well as for white noise.
The tool will make use of your own smartphones / devices to generate the necessary sounds as well as to record the decaying sound within the room.
The tool will need to be validated by evaluating the reverberation time of one indoor space and comparing the results with the recommended values in AS/NZS 2107:2000.
3. Deliverables and assessment
1. Written report (10 marks). Your findings are to be presented in a report (one report for each team) that is laid-out as follows:
a. An introduction of the problem
b. A methodology
c. A description of the room (s) you have investigated
d. A clear description of the procedure
e. A detailed description of your analysis software (computer code)
f. Results of reverberation time measurements along with a discussion in relation to recommended values
g. Conclusion including suggestions on how to improve the acoustic performance of the room(s)
This is to be completed and submitted to your designated facilitator before 5:00 pmin Friday following the last week for the project. After it is assessed, you report will be returned to you along with comments and feedback on your effort.
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