# Audio SA — spectrum analyzer

> Spectrum analyzer app for creating and customizing TFFT voiceprint images. (iPhone/iPad app by Yasuyoshi Ota.)

- Source: https://appshunter.io/ios/app/audio-sa/id6444715596 (this page in markdown: same URL + `.md`)
- Developer: [Yasuyoshi Ota](https://appshunter.io/developer/1500357652)
- Category: Utilities, Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.6 · 5 MB
- Languages: American English, Japanese
- Released: 2023-01-07
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/audio-sa/id6444715596/reviews.md

## What is Audio SA?

"Audio SA" is a spectrum analyzer that can capture voiceprints as TFFT images.
The created TFFT image can be exported as a high resolution image. (Image size example iPhoneSE3: 4096×4096, iPhoneX: 6144×6144)

If you just want to try creating a voiceprint, you don't need to worry about the settings. Just record your voice and run the TFFT to see the voiceprint.

"Audio SA" can also be used for FFT-related learning. You can also check changes in important characteristics such as FFT frequency resolution and dynamic range while switching the FFT size and window function.
As an additional function, we have implemented a simple waveform generator, so please try it when learning. The simple waveform generator can generate sine waves, square waves, Gaussian white noise, and their combinations.

When using TFFT images for machine learning, etc., it will be necessary to give sufficient consideration to the settings.
"Audio SA" allows you to set the audio waveform analysis range, FFT size, power spectrum scale, window function, and drawing color.

The analysis range of the audio waveform is set by scaling and moving the audio waveform. The displayed range becomes the analysis range.
Tap the play button to play only the analysis range, which is convenient for checking.

FFT size can be selected from 256,512,1024,2048,4096,8192,16384,32768.
(However, you can select from 256, 512, 1024, 2048, and 4096 during recording and playback.)

The power spectrum scale can be selected from Linear scale, Log scale, and Mel scale.
For Mel scale, you can set the break frequency. The mel scale is close to a linear scale up to the break frequency and close to a log scale after the break frequency. 700Hz, which is the most commonly used frequency, is set as the default value.

The window function can be selected from Blackman, Hamming, Hann, Rectangular.
It is recommended to choose Blackman when wide dynamic range is required and Hamming when high frequency resolution is required.
Roughly speaking, Hann is a trait between Blackman and Hamming.
For Rectangular, no special window function is multiplied during FFT transform. The audio data cut out from the audio waveform for the FFT size is used as it is.

In addition, the lower limit of the dynamic range when drawing TFFT images can also be set. It's easy to set up, just swipe up and down on the FFT image. The part displayed as the FFT image is drawn as it is in the TFFT image.

"Audio SA" consumes tickets to record audio. Tickets can be earned by watching ads.
However, if you purchase "Remove Ads" as an in-app purchase, you will be able to record without a ticket.

[details]
https://app.brain-workout.org/spectrumanalyzer-e/

## Key features

- TFFT voiceprint image generation
- High-resolution image export
- Customizable FFT analysis settings
- Adjustable audio waveform analysis range
- Simple waveform generator (sine, square, noise)
- Multiple FFT sizes and window functions

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove ads. | $3.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/audio-sa/id6444715596/reviews.md

### 5/5 — 凄いソフトです

*2025-01-02*

画像を読み込んで音にできたら神ソフト確定ですね！

## Frequently asked questions about Audio SA

### What is Audio SA?

Audio SA is a spectrum analyzer that captures voiceprints as TFFT images. It allows users to export these images in high resolution and offers extensive customization for audio waveform analysis.

### How does Audio SA generate voiceprints?

Audio SA records your voice and processes it using the TFFT algorithm to create a visual representation called a voiceprint. You can then export this as a high-resolution image.

### Can I customize the audio analysis in Audio SA?

Yes, Audio SA offers deep customization. You can adjust the analysis range, FFT size (from 256 to 32768), power spectrum scale (Linear, Log, Mel), and select from various window functions like Blackman, Hamming, and Hann.

### Does Audio SA have a waveform generator?

Yes, Audio SA includes a simple waveform generator. It can create sine waves, square waves, Gaussian white noise, and combinations of these, which is useful for learning and testing.

### How does Audio SA handle ads and purchases?

Audio SA is free to download and use, but it consumes tickets to record audio. Tickets can be earned by watching ads. An in-app purchase is available to remove ads and record without tickets.

### What devices is Audio SA compatible with?

Audio SA is designed for iOS devices, including iPhone, iPad, and iPod. It is rated for ages 4 and up.

### How often is Audio SA updated?

The latest version of Audio SA is 1.0.7, last updated on August 24, 2026. This suggests a relatively recent update frequency, though specific intervals are not detailed.

### Is Audio SA suitable for machine learning applications?

Yes, Audio SA can be used for machine learning. The app allows for detailed consideration of settings like analysis range, FFT size, and power spectrum scale, which are crucial for preparing data for machine learning.

## Version history (last 5 releases)

### 1.0.7 — 2026-08-24

performance improvements

### 1.0.6 — 2025-12-17

performance improvements

### 1.0.5 — 2025-10-18

performance improvement

### 1.0.4 — 2024-12-31

performance improvement

### 1.0.3 — 2024-02-20

performance improvement

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## More apps by Yasuyoshi Ota

- [Kinetic Visual Acuity](https://appshunter.io/ios/app/kinetic-visual-acuity/id315045189)
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- [Amida Mikann](https://appshunter.io/ios/app/amida-mikann/id358691639)
- [2 Digit Multiplication](https://appshunter.io/ios/app/2-digit-multiplication/id395133470)

All apps by Yasuyoshi Ota: https://appshunter.io/developer/1500357652

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*