Room Acoustics Exercise

 

 

 

1. Pick the room you want to analyze.  The room shouldn’t be too small or complicated architecturally.  You will be calculating the volume and absorbing area using the Sabine model discussed in class.

 

*  Make a drawing of the room with both vertical and horizontal elevations.  You might also include a digital picture.

 

2. Using Audacity, measure the reverberation time using handclaps and/or slapstick strikes.   For the sound you are analyzing, include a plot of sound amplitude in dBs versus time in your report. See this webpage for help.

 

3. Determine the response of your measuring system. Using Audacity, measure the “reverberation time” for an echo-free area. Appropriate places are in "The Box" or outside away from buildings. How does your measuring system's response time affect your reverberation measurement in #2?

 

4.  Determine the spectrum of your impulsive noise source (handclap and slapstick). Use SFSWin to make a plot of frequency vs. time for your source and include this plot in your report. Comment on the frequency content of noise source.

 

5. Comment on the possible uses for this room as determined by the reverberation time and the room volume.

 

6. Calculate the reverberation time using the Sabine model.  Use the absorption values for frequencies that are present in your noise source.  (See Exercise 1.)   How does the spectrum of your noise source measured in #4 affect your reverberation calculation? For information on this calculation, see section 23.5 in your text and this webpage.  Compare your result with what you measured.

 

7. Write a report of your findings.  This should contain all of the material above plus your own observations.  Various criteria for judging a room's acoustics may be found on this webpage.