High-Frequency Noise Monitor for Android

11 things about High-Frequency Noise Monitor

1. This app collects randomly fluctuating high-frequency noise from the iPhone's built-in microphone and performs frequency analysis in real time.

2. The spectrogram is a graph showing the analysis results of the frequency spectrum of sound, with time on the vertical axis, frequency on the horizontal axis, and signal strength in colors.

3. High-frequency noise does not often occur at a constant volume or frequency, but often occurs in a certain cycle or randomly.

4. For example, harmonic noise is radiated from the main body of an electronic device or the power lines of a power conversion device such as an AC-DC power adapter, and depending on its power level, it may affect peripheral devices.

5. The frequency of the sound varies depending on the type of vermin, and some devices incorporate sensors to change the volume and frequency over time.

6. It displays the real-time instantaneous frequency analysis result and the trace of frequency time variation.

7. "High-Frequency Noise Monitor" is a high-frequency noise analysis tool that specializes in high-frequency bands above 8 kHz.

8. - The measurement of high frequency sounds depends on the sensitivity characteristics of the built-in microphone, so it may vary depending on the iPhone model.

9. In general, noise may contain relatively high frequency components depending on its source, and this is classified as high frequency noise.

10. There are also devices that generate high-frequency noise to drive away vermin such as rats and weasels.

11. In addition, it retains the PCM data for 20 seconds just before the measurement is stopped and displays a spectrogram of FFT and octave band analysis.