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I measured room acoustics and analysed the data as a project.

The procedures can be roughly divided into two as below.

IR Measurement
1. Generate sine sweep by using AURORA (20-20kHz)
2. Set equipment at each place
3. Physical measurement of spaces by using measurement and laser metre
4. Record only noise
5. Measure impulse responses with sine sweep
6. Measure impulse responses with balloon
7. Repeat acoustics measurement (2 to 6)
Noise Measurement
Measure noise by using CEL-254 Digital Impulse Sound Level Metre - Setting on sound level metre
Mode: SPL (sound pressure level) for normal noise measurement Range: A LO (low range)
Response: I (impulse response)

And then, I calculated a reverberation time of each measurement by RT60 on MATLAB.

Hardware
 Two speakers: Genelec 8030A
 Two microphones: AKG C414B XLII Pair
 Four microphone stands: K&M Mic Stand
 Audio Interface: PreSonus AudioBox iTwo
 XLR Male to XLR Female
 XLR Male to TRS Jack
 Measurement
 Sound source: Balloon
 PC
 Sound level meter: CEL-254 Digital Impulse Sound Level Metre Laser metre: BOSCH GLM 80 Professional
Software
 RME(Fireface 800 setting) TotalMix
 Reaper
 Audacity
 AURORA

The basic principle of an RT60 measurement is visualized as above.

The slope of this is defined by the reverberation time.

© 2017 created by Ayaka Hara