Sound Level Analyzer
"Sound Level Analyzer" is a sound level measurement iPhone app with sound frequency analysis tools.
Available in variety of applications as the neighboring environmental noise measurement, audio system check, vehicle interior noise check, sound check of live events, and more.
"Sound Level Analyzer" has additional analysis modes, which are time graph, frequency realtime analyzer (RTA) and FFT analyzer.
It can be used to analyze the characteristics for the sound/noise source.
The latest version supports iOS 17 and improves stability and performance. Changed the display position of the occurrence time and the maximum level in "Display Max" at P.S. mode.
The WHO has proven direct links between noise and health risks; tinnitus, sleep disturbance, stress, cognitive impairment, heart diseases and annoyance in general. Please check your environmental noise for your wellness.
In addition, the high-end app "Sound Level Analyzer PRO" has more powerful sound / noise analysis function in addition to the sound level measurement function, so please consider using these apps for your advanced requirements.
Please to click the following link to download "Sound Level Analyzer" from App StoreTM. It will be open the download page on App StoreTM.
"Sound Level Analyzer" has the following features:
- Leq (equivalent sound level), Min (minimum value), Max (maximum value), Avg (time average equivalent sound level)
- Frequency weighting correction characteristics: A (for noise level meter), C (for sound level measurement), Z (no correction)
- Time weighting characteristics: Fast = 0.125 sec, Slow = 1.0 sec
- Display Range: 0 - 130 dB
- Spectrum analyzer function: FFT analysis, 1/3-octave band response analysis.
- 1/3-octave band center frequency: 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200,
250, 315, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k, 6.3k, 8k, 10k, 12.5k, 16k, 20k (Hz)
- FFT frequency range settings: 100Hz - 20kHz (FFT all) / 100Hz - 3kHz / 3k - 6kHz
- Measured value display function in 1/3 oct band response analysis. (OctVal)
- Power spectrum display function at the time of occurrence of Max. (Display Max)
"Sound Level Analyzer" can be used for various applications as follows:
In addition, the followings are examples of the magnitude of the sound level in the measurement of environmental noise.
Note: The standard noise measurement range is 30-130dBA, and the measured value (Leq) is about 30dBA in a quiet room of the household. Due to the presence of background noise, noise levels are never measured at 0dBA even in very quiet environments.
In order for this app to work properly, it is necessary to make the following initial settings related to the iOS system.
At the initial startup after installing the app, the iOS system asks for permission to access the built-in microphone. In this case, you need to enable access to "Microphone".
If you have not enabled this setting, this app can not work by privacy restrictions of the iOS system. Please enable the access permission on the iOS setting, "Settings > Privacy & Security > Microphone".
When the first time you save an image data with Snapshot, the iOS system asks for permission to access the "Photos" library. In this case, you need to enable access to "Photos".
If you have not enabled this setting, this app can not work by privacy restrictions of the iOS system. Please enable the access permission on the iOS setting, "Settings > Privacy & Security > Photos".
"Sound Level Analyzer" has two types of measurement analysis modes. By tapping on each mode button, you can select one of the modes and display it. The function of each mode is as follows.
Measurement analysis mode
"MAIN (Leq) mode" and "P.S mode" are also switched during measurement operation.
In addition, it will start up in MAIN (Leq) mode at the first boot-up.
"MAIN (Leq) mode" makes the sound level measurement in general. In this case, by applying the appropriate Frequency Correction, Time Correction, and Level Correction, you can be the best sound level measurement.
Tap the play button to start the sound level measurement, and it then pause by tapping it again.
Sound level measurements are displayed measured values of Equivalent continuous sound level (Leq), minimum value (Min), maximum value (Max) and Time average equivalent sound level (Avg) in dB units. The Leq is also displayed as a color bar graph.
It also displays a short-term time variability graph at the same time. This graph shows the sound level fluctuations for the past 20 seconds. The graph shows the Leq level (white bar), the Avg level (green line), and the moving average level for 10 seconds (orange line).
It can be measured as parameters, Time weighting correction, Frequency weighting correction, and Level calibration, to set as follows:
Time weighting correction
It specifies the time constant of calculating the sound level. Please set in accordance with the occurrence tendency and type of sound source.
Frequency weighting correction
It is a weighting filter that limits the frequency band of the input signal. Please set according to the measurement applications.
Level Calibration
You can specify the reference level in the offset range. Tap the calibration value window in Info view, the input keyboard will appear. If you have the standard sound level meter, please use it to adjust the reference level.
"P.S mode" displays frequency spectrum analysis in real time. Measurement is displayed by 1/3 octave band response and FFT analysis.
The 1/3 octave band analysis displays the signal response of the input signal's frequency spectrum in 1/3 octave and 24 band (100 Hz to 20 kHz). FFT analysis displays the FFT spectrum by Fast Fourier transform.
FFT frequency range
Tap "OctVal" button, it can display the measured values for each band of 1/3 octave band analysis in real-time.
Tap "Display Max" button, it can display the frequency spectrum characteristics at the moment when the maximum sound level "Max" has occurred.
Tap "Snap" button, you can capture the measured image to Photos. It is possible in all modes.
Tap "Timer Setting" picker to select the time setting from 1 minute to a maximum of 1 hours. To return to the previous view by tapping "Close" button.
Tap "Setting" button, it is displayed the product information and function description. The screen description can be scrolled up and down. Tap "Close" button, it will return to the previous measurement view.
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