NoiSee Sound Level Meter

NoiSee is a professional sound level meter application designed for Android devices. It meets all the requirements for a professional ANSI or IEC compliant sound level meter, including filters, averaging modes, and statistics. The app is specifically designed for occupational health and live sound measurements, and was created by a team with over 20 years of experience in calibration and owning a Sound Level Meter calibration laboratory that meets ISO 17025 requirements. The same calibration equipment used for the development of the app ensures accuracy and precision.

It is important to note that NoiSee is only supported on certain devices with internal microphones that have been calibrated and compensated for frequency response. These devices include the Galaxy S10e, S22, S23, S23 Ultra, A52, A54, Pixel 3 XL, Xiaomi 12 Pro, and Nothing CMF Phone 2 Pro. For other devices, the app makes an estimation of the internal microphone sensitivity, but it may be off by more than 10 dB.

The app also includes parameters and UI optimizations for live event analysis and live audio monitoring. This includes the running LAeq (5min, 10min, 15min, and 20min averaging intervals) and a standard live sound target curve in spectrum analysis. The initial calibration of the app has been verified for differences in microphones between devices of the same model, and is determined through testing in an anechoic chamber meant for calibration of professional Sound Level Meters. It is not recommended to change the initial calibration for supported phones, as the internal sensitivity of the microphones has been found to have insignificant variation between devices.

NoiSee makes full use of your device's dynamic range, which is approximately 35 dB to 95 dB (re. 20 uPa), and frequency response range, which is from 40 Hz to 18 kHz and 35 dB to 110 dB for frequencies from 100 Hz to 8 kHz.

The app features a history view of all relevant parameters, as well as a statistics view of the current measurement, including percentiles from ISO 1996. The spectrum view offers a time-history of the sound level, with options for different time-weightings and frequency analysis according to IEC 61260 and ANSI S1.11 standards.

NoiSee is also compliant with occupational health standards (ISO 9612, OSHA/NIOSH) and includes parameters such as Noise DOSE, Elapsed time, Threshold, Reference level, and Exchange rate. Special parameters like LEX 8h, Projected DOSE, and Time to reach 100% DOSE are also available.

The app has been tested with external microphones, including MicW i436 and MicW D236, which are calibrated measurement microphones that comply with the Class 2 (IEC 61672) sound level meter standard. For those using an acoustic calibrator, NoiSee can perform automatic calibration. The app also has robust native drivers for dongles that can be used when connecting i436 to a USB-C based device, allowing for measurements up to 130 dB.

In-app purchases are available for premium octave analysis, logging, and recording. These include non-standard time weightings, spectrum analysis in ⅓ octave or less, one second logging of spectrum and total parameters, the ability to export in CSV, and recording in 24-bit WAV or AAC formats.