High-Frequency Noise Monitor 4.0
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Paid Version
Publisher Description
"High-Frequency Noise Monitor" is a high-frequency noise analysis tool that specializes in high-frequency bands above 8 kHz.
You may be exposed to artificial high-frequency noise on a daily basis that is inaudible to the human ear. This app allows you to monitor such high frequency noises and examine their occurrence.
In general, noise may contain relatively high frequency components depending on its source, and this is classified as high frequency noise.
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.
There are also devices that generate high-frequency noise to drive away vermin such as rats and weasels. 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. When such devices are installed in the vicinity, there are cases where they can lead to noise problems with adverse effects on human health.
High-frequency noise does not often occur at a constant volume or frequency, but often occurs in a certain cycle or randomly. It is not easy to detect such high-frequency noise.
This app collects randomly fluctuating high-frequency noise from the iPhone's built-in microphone and performs frequency analysis in real time.
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. 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. You can visually monitor the occurrence of high-frequency noise.
Features:
# Main: Real-time frequency analysis function.
- Real-time measurement: Automatically stops after a maximum of approximately 180 seconds.
- Maximum frequency detection and power level display (dB unit in 20 μPa standard)
- Time trace display: approx. 10 seconds
- Display gain adjustment (Range): 3 levels (0dB - 90dB / -10dB - 80dB / -20dB - 70dB)
# Analysis: FFT/octave band spectrogram analysis function (PCM data for 20 seconds immediately before the measurement is stopped is saved, and spectrogram analysis is performed.)
- FFT spectrogram analysis (FFT)
- Octave spectrogram analysis (OCT)
- Display gain switching (Range): 3 levels
- Playback function: approx. 20 seconds.
- Playback sound filter (Filter): 8kHz high-pass filter to cut off low-mid range sound.
# Snapshot (Snap): Save the analysis result as an image file.
Operation Procedure:
1) Sound measurement and real-time frequency analysis (Main)
Tap Start button in Main mode to start measurement. It displays the real-time instantaneous frequency analysis result and the trace of frequency time variation. The frequency and signal level at which the maximum level is detected can be displayed numerically.
2) Spectrogram analysis (Analysis)
After measurement in Main mode, tap the Analysis button to perform spectrogram analysis. Tap FFT or OCT button to display the spectrogram by FFT or octave band analysis.
3) Snapshot
By tapping Snap button, you can save the measurement result as an image file in "Photos".
Notes:
- 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.
- Wireless (Bluetooth) headphones and headset are not supported.
Please visit our iOS app support page for more information on this app.
Oct 11, 2023
Version 4.0
- Improved internal processing and performance.
- Requires iOS 16.6 or later.
About High-Frequency Noise Monitor
High-Frequency Noise Monitor is a paid app for iOS published in the System Maintenance list of apps, part of System Utilities.
The company that develops High-Frequency Noise Monitor is TOON,LLC. The latest version released by its developer is 4.0.
To install High-Frequency Noise Monitor on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2023-10-11 and was downloaded 2 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the High-Frequency Noise Monitor as malware if the download link is broken.
How to install High-Frequency Noise Monitor on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the High-Frequency Noise Monitor is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After High-Frequency Noise Monitor is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
