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.