Audio / Spectrum Analyzer
RTA (FFT / Spectrogram)
| Revenue % | ||||
|---|---|---|---|---|
| One-time purchase | 175 | $10.45 – $15.83 |
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Description
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: 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 ~ 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).
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