Audio Frequency Analyzer
"Audio Frequency Analyzer" is a powerful Real-time Audio Analyzer (RTA) app for iPhone.
"Audio Frequency Analyzer" uses our proprietary signal processing technology to analyze incoming audio signals and provides a precision frequency response measurement and spectral visualization.
In the frequency range of 20kHz from 23Hz, the response of the measurement frequency can be displayed in the logarithmic FFT scale or 30 split band scale of 1/3 Octave.
"Audio Frequency Analyzer" is available in a variety of applications, such as sound room tuning, speaker settings, audio equipment testing, stage setting measurement, evaluation of sound mixing environment and Investigation of noise environment.
The latest version supports iOS 17 and improves stability and performance.
Please to click the link below to visit the product page on the AppStoreTM.
"Audio Frequency Analyzer" measures the input acoustic signals, and displays the frequency spectrum in 30 split bands of 1/3 octave , or in the Logarithmic FFT scale.
"Audio Frequency Analyzer" has the following features:
"Audio Frequency Analyzer" can be very useful for a variety of applications including:
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".
At the time of starting this app "Audio Frequency Analyzer", this topview will be displayed. All operations can be carried out in the topview screen.
The access permission to the built-in microphone will be confirmed from the iOS system at the first start-up. Please enable access to the built-in microphone.
The topview has Measurement Mode(OCT/FFT), Calibration(Calibrate), Measured oct value (dB@OCT), Peak Hold(Hold), Start/Stop, Display response(Fast/Slow), Scroll, Slope adjustment(Slope), Snapshot(Snap) and Info view(Info) at right side. In addition, it has the measurement display (TRACE DISPLAY) at left side. By touching scroll the screen up and down direction, you can easily change the display range.
TRACE DISPLAY is the image monitor that displays the frequency spectrum measurements. The display shows the amplitude on the Y-axis, and the frequency of the 1/3 octave scale or logarithmic FFT scale on the X-axis.
TRACE DISPLAY is visible in the amplitude range of 70dB. By Touch Scroll setting, you can be observed in the amplitude display area that is shifted at +30dB to -130dB. The default position is set to 0dB. By tapping "Scroll" button, you can return to the reference level of 0 dB.
"Start/Stop" is a function to control the measurement of Frequency Analyzer. Tap "Start" button to start measurement and tap again to stop. Available to verify the instantaneous measurement results.
Measurement function has two measurement modes, 1/3 octave mode (OCT), or, FFT mode (FFT). You can select a measurement mode by tapping either mode. The default is set to 1/3 octave mode.
In 1/3 octave mode, you can measure the energy average value of each frequency band by frequency division in 1/3 octave x 30 bands. You can analyze spectrum in a specific frequency band, not the instantaneous frequency peak. It is suitable for more quantitative spectrum analysis.
In FFT mode, It will perform an instantaneous FFT measurement in all measurement frequency. It can measure the instantaneous frequency peak situations, such as cases where multiple harmonics are generated.
"Hold" is a display function that is held the accumulated peak level. The measurement value of 1/3 octave mode or FFT mode will always be displayed holding the maximum value.
In addition, in 1/3 octave mode, when ideal pink noise (-3dB/oct) is measured and displayed in HOLD, a flat frequency response is theoretically obtained in all frequency bands.
It is the display response control function. The display refreshing speed can be switched between "Fast" and "Slow". For example, if the input signal changes rapidly and the display is difficult to see, set it to "Slow".
When you tap "Scroll" button, TRACE DISPLAY will be initialized. Reference level of TRACE DISPLAY returns to 0dB. Please use ”Scroll" if you want to initialize the image display immediately or to undo the information display.
"Calibrate" is a function to set the measurement offset gain. It is effective only when measuring in 1/3 octave mode.
By adjusting the characteristics according to the external microphone used, high accuracy measurement can be realized.
If you tap "Calibrate" button, a setting window that can be set to gain correction value is displayed. The overall level value can be set in the range of -15 dB to +15 dB. Also, the offset value per 1/3 octave can be set independently in the range of -15 dB to +15 dB.
The 1/3 octave band offset level setting allows you to save two offset data. The saved data can also be reloaded.
By tapping the "dB@OCT" button, the response level for each band is displayed in the 1/3 octave band measurement, so it can assist for calibration adjustment.
In FFT mode, you can change the slope of the FFT graph by tapping the "Slope" button. Depending on the source to be observed, this slope adjustment (3dB/oct, center frequency 1kHz) can make the FFT graph display more visible.
"Snap" is a snapshot function to save the measurement result image to the Photos (camera roll). The access permission to Photos will be confirmed from the iOS system at the first snapshot usage. Please enable access to Photos.
If you tap "Info" button, it will be displayed the usage description and product information.
By tapping "Close" button, it return to the measurement view.
* Correspond to iOS 17.0. Improved internal processing and performance.
* Correspond to iOS 16.0, Renewed UI design, Performance improvement.
* Correspond to iOS 15.0, Renewed UI design. Added a new function to change the slope in the FFT graph, Improved stability.
* Correspond to iOS 12.5, Added the Peak Hold function at FFT mode, Improved stability.
* Correspond to iOS 12.4, Update of UI design, Minor bug fixes.
* Correspond to iOS 12.1, Update of UI design, Improved stability.
* Correspond to iOS 11.3, Improved stability.
* Performance improvement.
* Performance improvement.
* Correspond to iOS 11.2, Update of UI design, Performance improvement.
* Add the 1/3 octave band calibration function.
* Correspond to iOS 9.2, Performance improvement.
* Correspond to iOS 8.4, Update of UI design, Performance improvement.
* Add display response control function.
* Delete Monitor function.
* Correspond to iOS 8.1, Major Update. Changed UI design design, Performance improvement.
* Add Peak-hold function.
* Add Snapshot function.
* Add gain calibration function.
* Improved low frequency response.
* Optimized code.
* Correspond to iOS 7.1, Major Update. Performance improvement
* Changed UI design and App name.
* Add Function of Touch-Scroll to adjust visible amplitude ranges.
* Update for iOS 7.0, Redesign of UI, performance improvement
* Adjustment of frequency accuracy, Improvement of sensitivity
Please send a review of your comments and requests for this app. We will use your review to improve our products. Thank you for your cooperation.
For inquiries and consultation regarding our iOS app products, please contact the following support desk.