©2019 Open Acoustic Devices

Audio Quality

AudioMoth

Example Recordings

How does AudioMoth compare?

AudioMoth's audio quality is fit for purpose for many environmental and biodiversity applications. The following links are evaluations and comparisons from AudioMoth users.

A nice way to visualise audio quality is looking at the difference between a recorded known signal and recorded noise present at silence, known as signal to noise ratio (SNR). Below are four plots used to calculate the SNR of AudioMoth and a widely used wildlife monitoring device, the SongMeter SM2. The top plots are 1kHz sine wave signals recorded at close to full range and the bottom plots are silence recordings showing low level noise. AudioMoth's SNR is 42dB, ~5dB less than the SM2. If you would like to discuss your applications audio quality requirements further, please get in touch on the support forum

AudioMoth

Mic: On-board MEMS, 48kHz sample rate, max gain

SongMeter SM2

Mic: SMXII, 48kHz sample rate, min (default) gain

1kHz @ 1 m, ~1 Pa
Silence
SNR: 44.2 dB
1kHz @ 1 m, ~1 Pa
Silence
SNR: 48.7 dB

Measurement Procedure

For this test we played a 1kHz sound source @ ~1 Pa measured from 1 m. Devices were positioned 1 m away from the sound source and gain was adjusted to achieve close to full range. Measurements were repeated with the same settings in silence and SNR was then calculated from the two measurements.