Acoustic interaction measurement
Acoustic interaction measurement
(OP)
I need measuring two buzzer working on 40Hz to verify the interaction to the circuit and SPL.
Below is my test schematic figure, I planed to use the free version of TrueRTA to measure the SPL, do any suggestion?
should I prepare rheostat or variometer or varicapacitance to measure the impedance or simply calculate it from the difference with theory output of SPL?
Below is my test schematic figure, I planed to use the free version of TrueRTA to measure the SPL, do any suggestion?
should I prepare rheostat or variometer or varicapacitance to measure the impedance or simply calculate it from the difference with theory output of SPL?






RE: Acoustic interaction measurement
The setup should be OK for relative (uncalibrated) SPL measurements. Many internal sound cards have low frequency response roll-off starting about 100-Hz, but again for relative dB changes that should be OK with enough response at 40-Hz. If both speakes have same electrical sounrce, then I assume you are trying to measure constructive/destructive interference (phasing) with the two speakers. Note that 40-Hz is low frequency audio, and the sound wavelength in air is about 27-ft (8.2-m)! This would have a significant effect on the microphone and speaker spacings.
Walt
RE: Acoustic interaction measurement
RE: Acoustic interaction measurement
You might want a more capable sound program to measure electrical and SPL properties. Take a look at ARTA along with application examples:
http://www.artalabs.hr/
Walt