Starting off right

Here I will post the latest tests and findings regarding Nosey MEMS performance.

List of tests:

Noise Floor and Resonance Characteristics

Beyond frequency response matching, understanding the noise floor and self-resonance behavior of the MEMS microphones provides insight into the device's practical performance limits and acoustic characteristics.

This test was carried out using two different sets of harvesting resistors (R,R5 are 10k, while R11,R12 are stock 15k). The reason wasgkitarag102030

NOTE:

The analysis was carried on a modified Nosey MEMS, where Nasality L-channel has 10k harvesting resistors, while Orality R-channel has the stock 15k resistors. In theory, this impact should be minimal. New tests will be run at a later date.

Noise Floor Analysis

The noise floor spectrum reveals the baseline electronic noise present in the microphone system when no acoustic signal is present. Both L and R channels exhibit similar characteristics:

Left channel noise floor spectrum Right channel noise floor spectrum

The noise spectrum shows approximately -51 dB at 50 Hz, rolling off smoothly to -90 dB between 2-4 kHz.

Averaged Resonance Spectrum

Averaging the entire test session reduces the influence of transient positioning variations and reveals the consistent acoustic signature of both channels:

Left channel averaged resonance spectrum Right channel averaged resonance spectrum

Both channels demonstrate remarkably similar patterns:

  • Elevated plateau at -48 dB from 50 Hz to 500 Hz — combination of residual noise floor and low-frequency acoustic coupling
  • Roll-off to -78 dB around 2 kHz — transition from noise-dominated to resonance-dominated spectrum
  • Resonance peaks at approximately 5 kHz, 9 kHz, 15 kHz, and 21 kHz — acoustic resonances of the MEMS capsule cavity and mounting structure?