Hi,
I have some hardware questions and was hoping to find some help here.
Some background:
I work on a project about failures detection in an engine room with audio sensors. The concept is a small device with two microphones which will be able to detect chances in the tools normal behavior and send indication about the direction of the failed-tool relative to the device (that’s why two mics needed).
I assembled a prototype with teensy4.0 and two Digilent mic module (https://reference.digilentinc.com/reference/pmod/pmodmic3/start). It was very easy to assemble with it’s SPI communication. We had a very nice and successful feasibility test that showed very promising result.
Unfortunately, I noticed that when the noise level in the room increased to very high levels, the signal got corrupted. After some investigations, we came to conclusion that we need different mic with higher acoustic overload point and decided to try the following one: https://www.digikey.com/product-det...es-inc/S-VM2020-C/2022-S-VM2020-C-ND/10259330 . I briefly went over the ADC info from- https://www.pjrc.com/teensy/gui/?info=AudioInputAnalog but still have concerns about two issues (It might be trivial…):
This mic has differential output. I read somewhere that I can just connect the V_out- to ground and measure V_out+. What is the penalty of such setup? Ideally, should I just measure both signals simultaneously in both ADC and reduce the results?
Thanks in advance!
I have some hardware questions and was hoping to find some help here.
Some background:
I work on a project about failures detection in an engine room with audio sensors. The concept is a small device with two microphones which will be able to detect chances in the tools normal behavior and send indication about the direction of the failed-tool relative to the device (that’s why two mics needed).
I assembled a prototype with teensy4.0 and two Digilent mic module (https://reference.digilentinc.com/reference/pmod/pmodmic3/start). It was very easy to assemble with it’s SPI communication. We had a very nice and successful feasibility test that showed very promising result.
Unfortunately, I noticed that when the noise level in the room increased to very high levels, the signal got corrupted. After some investigations, we came to conclusion that we need different mic with higher acoustic overload point and decided to try the following one: https://www.digikey.com/product-det...es-inc/S-VM2020-C/2022-S-VM2020-C-ND/10259330 . I briefly went over the ADC info from- https://www.pjrc.com/teensy/gui/?info=AudioInputAnalog but still have concerns about two issues (It might be trivial…):
This mic has differential output. I read somewhere that I can just connect the V_out- to ground and measure V_out+. What is the penalty of such setup? Ideally, should I just measure both signals simultaneously in both ADC and reduce the results?
Thanks in advance!