Audio / Spectrum Analyzer
RTA (FFT / Spectrogram)
Free · In-App Purchases
(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
- FFT size
- Window function
- Spectrum average
- Spectrum Tilt
- Frequency weighting (Flat, dBA, dBC)
- The type of expressing the 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
The Pro version offers Ad-Free Viewing and High-Resolution Analysis (FFT size: 16384, 32768, Spectrum Average: 4, 8).
[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 / W+2D / 1D+2D
Layout : Vertical / Horizon
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
3-1. FFT size :
1024, 2048, 4096, 8192, 16384, 32768
(* 16384, 32768 is available in the Pro version.)
3-2. Window function :
Hanning, Hamming, Blackman, No window
4. 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.
5. Spectrum Tilt :
Compensates the visual slope of the spectrum around a 1 kHz pivot.
-6.0 to +6.0 dB/oct in 0.5 dB/oct steps (0 means no tilt).
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
- 1/24, 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: Black, White
- WaveForm: Line Color (Green, Yellow, Invert), Line Width (1.0 ~ 6.0 px)
- Spectrum: Bar color (Green, Yellow, Color patterns)
- Spectrogram: Colormap, Display range (-150 ~ -60 dB), Display time (4 ~ 60 sec), Apply Spectrum Tilt
- 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).
- Added a time scale to the spectrogram. (can be toggled on/off in the settings)
- Updated the app’s compatibility requirements to iOS / iPadOS 17.0 or later.
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
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Loop-Sessions.LLC.
- Size
- 5.6 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Pro (Remove ads, High-Res analysis) Rp 229ribu
- Copyright
- © Loop-Sessions.LLC.