(This app is developed in Japan. If it's displayed in "Japanese", please add "English" to "PREFERRED LANGUAGES" in [Settings]-[General]-[Language and Region].)
This RTA app supports simultaneous display of "Audio Waveform", as well as the FFT-based "Amplitude Spectrum" (frequency magnitude) and "Spectrogram" (frequency distribution over time), for audio signals input from a microphone.
(FFT: Fast Fourier Transform, RTA: Real Time Analyzer)
[Features]
- Supports simultaneous display of Waveform / Spectrum / Spectrogram.
- Supports orientation both portrait and landscape.
- Selectable configuration of Waveform / Spectrum / Spectrogram display.
- Selectable FFT size.
- Selectable window function.
- Selectable Spectrum Average.
- Selectable frequency weighting. (Flat, dBA, dBC)
- Selectable the type of expressing the X direction (frequency) of Spectrum / Spectrogram. (Linear, Log)
- Displays the peak level and its frequency of the spectrum.
- Peak Hold (displays the results of holding past peak values of the spectrum).
- Octave Analysis (displays the spectrum divided into octave bands).
- Generates the audio signal (Sine, Triangle, Squire, Saw)
- Generates the noise signal (white noise, pink noise)
- Pitch meter display.
[Setting items]
1. Screen structure :
Select the display screen configuration.
View Num : 1, 2
View Type :
- 1 screen : Wave (Waveform) / 1D (Spectrum) / 2D (Spectrogram)
- 2 screens : W+1D (Waveform + Spectrum) / W+2D (Waveform + Spectrogram) / 1D+2D (Spectrum + Spectrogram)
Layout : Vertical (displayed vertically), Horizon (displayed horizontally)
2. Frequency Axis Scale Type :
Selectable the type of expressing the X direction (frequency) of Spectrum / Spectrogram.
- Linear: Distributed at equal intervals
- Log: The intervals increase logarithmically
3. FFT size :
Selectable FFT size. (number of samples used when performing FFT)
1024, 2048, 4096, 8192, 16384
(* 16384 is available in the Pro version.)
4. Window function :
Selectable window function (multiplication just before FFT) used for spectrum calculation.
Hanning, Hamming, Blackman, No window
5. Spectrum Average
Number of spectrum average for a display of spectrum.
1, 2, 4, 8 (init value: 1)
(* 4 and 8 are available in the Pro version.)
Higher value will make the spectrum less noisy and more smooth, at the cost of lower time resolution.
6. Frequency Weighting :
Selectable frequency weighting.
- Flat: No frequency weighting is applied.
- dB(A): Frequency response that takes into account human hearing.
- dB(C): Relatively flat response.
7. Peak Hold :
Displays the results of holding the past maximum values (peak values) of the spectrum.
8. Octave Analysis :
Displays the results of classifying the spectrum into octave bands.
Division method:
- FFT: Spectral display
- 1/12, 1/6, 1/3, 1 octave: Display divided into octave bands
Calc method:
- Max: Displays the maximum spectrum value in each band
- Average: Displays the average spectrum value in each band
9. Generates the audio signal :
Set the audio signal to be generated.
- There are 4 types of waveform. (Sine, Triangle, Squire, Saw)
- It can set the value of the frequency in 20Hz - 20000Hz.
10. Generates the noise signal :
Set the noise signal to be generated.
- There are 2 types of noise. (White noise, pink noise)
[Other]
- Background color selection: Black, White
- WaveForm: Line Color (Green, Yellow, Invert), Line Width (1.0 ~ 5.0 px)
- Spectrum: Bar color (Green, Yellow, Colorful)
- Spectrogram: Colormap selection, Display range (-150 ~ -60 dB), Display time (4 ~ 15 sec)
- Bluetooth connection policy selection (disabled, HFP, A2DP).
- Scaling of Waveform / Spectrum display in the Y direction (magnification: 0.5 - 2.0).
- Scaling of Spectrum / Spectrogram display in the X direction (magnification: 1.0 - 16.0).
[Information]
- The vertical line spacing in the waveform display is 2 mSec.
- The calculation of spectrum and spectrogram uses the vDSP library.
The Pro version offers Ad-Free Viewing and High-Resolution Analysis (FFT size: 16384, Spectrum Average: 4, 8).
Everything works as intended with a lot of customization but what would be really nice is a way to change the sampling rate to make measurements more readable.
It works
56wrty329
It works but one feature I would add would be options for selecting an audio file to analyze or using some other input sorce other than the microphone
Sound Tech Recommended
Bleikr
Tested app for lowest Hz detection using a Stormwise VLF / Earth frequency radio.App easily monitors down to 20 Hz, so this may also be useful as a ghost hunting device, as these phenomena usually appear in the 19 Hz range.
Battery and cpu usage 🔥
-PEDRAM-
A program that causes the phone's battery usage to drop from 100% to 74% in 30 minutes and makes the phone heat up like a frying pan! In the phone's logs, most of the errors and issues are related to the analyzer! I hope the respected developers work towards improving these issues and we witness significant progress.
Developer Response
Thank you for your comment.In the latest version, background operation has been disabled. This should improve the situation. Please update and try it out.
Added Spectrogram display.
It supports simultaneous display of up to two screens from Waveform / Spectrum / Spectrogram.
The screen layout has also been changed.
The advertising system has been updated. As a result, banner ads have been changed to a slightly larger size.
Version 2.4.0
The developer, Loop-Sessions.LLC., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Usage Data
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Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
