Microphone evaluation

We attached the piezo buzzer, the Shadow guitar pickup and the piezoelectric film on a window and recorded their response to evaluate their quality.
After the recordings we performed a Fourier spectrum analysis of the sound-data.

Piezo-film analysis:


Piezo-buzzer analysis:


The comparisson shows a better response of the piezo-film, especially in the mid-range frequencies. Second came the guitar with the buzzer last, as expected.

Another factor that we evaluated was the unwanted noise levels picked up by the mics. Again, the piezo-film showed the lowest noise levels compared to the other two.