Hello there!
I am currently using AudioMoths (v. 1.1.0) for ornithological field work, and am working to obtain calibrated acoustic measurements of recordings using the PAMGuide developed by Merchant et al (2015). I have been successful in determining microphone sensitivity (dB re 1 V/Pa) and Gain for the AudioMoth devices, but I also need to determine what Merchant et al. (2015) call: the zero-to-peak voltage of the analogue-to-digital converter (vADC). For the Song Meter 2 (SM2+) the vADC is 1.414.
I am hoping that someone on the forum might be able to help me determine the correct vADC values for the AudioMoths I am using, or at least steer me in the right direction.
Thank you in advance for your time and support!
Chris 🦆
Hi Chris, The audio processing chain of AudioMoth from 1-4: 1. Microphone 2. Static Hardware amplifier with a voltage gain of 10 3. Adjustable software amplifier with an adjustable voltage gain, ranging from 0.33 to 30 4. ADC - AudioMoth uses a 2.5V reference voltage on the ADC, meaning 2.5V is the highest signal level the ADC can convert. Recordings are centered at 1.25V, so I assume the zero-to-peak voltage of AudioMoth is ±1.25V. I hope this helps. You may need to get in touch with the PAMGuide developers to see how this corresponds to the PAMGuide parameters and settings. Thanks,
Andy