FFT 4+
Andrew Smith
Designed for iPad
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- £9.99
- Offers In-App Purchases
Screenshots
Description
FFT is a high-resolution audio analysis tool for the iPhone and iPod touch. It uses the Fast Fourier Transform to analyze incoming audio, and displays a very detailed graph of amplitude vs. frequency.
Use this app with the built-in iOS device microphone, or upgrade to our iAudioInterface2 or iTestMic for a complete professional solution.
*** Designed for Acoustical Analysis
This application has been designed for acoustics work, and so the bins have been normalized to octaves, to get a display that will show a flat line for pink noise. You can control both the level of graph smoothing and decay time, to get as much or as little detail as you require.
You can also control the dB resolution of the graph, as well as the frequency range that is displayed.
*** Includes Signal Generator
Included in this app is the engine from our Generator app, which is a low-distortion, artifact-free signal generator. The signal generator appears as a heads-up display when you tap the icon, so you can see the graph while you adjust the generator. Generate sine waves, square waves (within limits), white noise, and pink noise, optionally in psuedo-balanced mode. All waveforms are generated in real time using high-precision algorithms.
*** Cursor Readout
Move your finger across the screen to get a cursor to read out exact dB levels and frequencies.
*** Touch-GUI Controls
Use a vertical pinch-open gesture to expand the dB scale.
Use a horizontal pinch-open gesture to expand the frequency scale.
*** Graph Smoothing
Smooth the graph by octave, 1/3, 1/6, 1/12, or 1/24 octave. Adjust the decay time from 0.5 seconds, for a very fast fluid display, to 8 seconds, or use Peak Hold or Average mode. Average mode is a true equal-weighted average, which can run continuously.
*** Peak Tracking
Turn on Peak Tracking to have FFT automatically find a label the frequency of the highest peak on your graph.
*** Tune the Parameters
Set the FFT size from 4096 to 32k points (depending on iOS device) , or select Equal Points Per Octave mode, for high-resolution analysis, even at low frequencies.
*** Calibration
FFT comes calibrated for the typical iPad, iPod touch, or iPhone microphone, and you can adjust the calibration. Microphone compensation files tailored to each iOS device are automatically applied.
*** Save and Recall
When your analysis is complete, you can save the graph image to your photo roll to include in a report, or export the data in an XLS file.
*** Display Multiple Graphs
Show a recalled graph on the screen in a different color.
*** Difference Mode
Use a stored graph as a baseline that is subtracted from the current graph in real time.
*** RTA or FFT?
If you are wondering if you should download this app or our FFT app, check out our website, we have a page devoted to this topic.
*** Other Audio Apps
Also, check out our other great audio and acoustics apps: AudioTools, our premier suite of audio and acoustics analysis apps, SPL, SPL Graph, for recording SPL over time, RTA, RT60, Generator, and Speaker Pop.
What’s New
Version 7.2
-Updated for latest iOS devices and new iOS versions
-Bug fixes and stability improvements
Ratings and Reviews
Musical pitches are not correct
This appears as if it could be a good app.
Severe let down, is that it incorrectly labels the musical notes. Using the apps own signal generator to create a 440hz sine wave, which is generally used for middle A, the app labels it as a G# . It seems to be a semi tone out for all of its pitches.
I hope this is can be remedied ASAP with an update.
Will change my review when it does.
Add Colours Choice?
First off, you get 5 stars simply because I like gadgets and this looks to be a good one. :)
However, I haven't used the app in anger so the rating is somewhat spurious.
The real purpose of this review is to add a request. I'm colour blind. I have the commonest kind too, namely red-receptor deficiency. A couple of my friends are exactly the same. Essentially brown = red, pink = grey, and worst of all here, green = yellow. (Other people's XL plots, for example, are almost impossible to discern when they combine the graphic representation of a few functions in one single diagram — those shades can be so hard to track and pin down from the legend, especially when they're pastel. Only the nice, simple, bright, kiddy kind of colours work fine for us Darwin's losers.)
So, is there any chance you might add a facility to change the standard colours of the function lines displayed? Pretty please? As I mentioned, the green and yellow lines are the worst — I have to resort to the use of logic to tell them apart. It's tricky but I'm afraid I might actually make a mistake one day. Oh wait, I just did — fixing an electrical socket. That's why I'm typing this from a hospital bed. :)
P.S. Blue is nice. I like blue.
Expensive but excellent
I've got literally hundreds of apps, too many to fit on my iPhone, this however is on of the few that remain in the first few pages of apps. It's definitely a gadget but as a geek I love it. It's accurate and easy to use, the sine-wave generator can replicate tones exactly as sampled fooling many people into thinking they're hearing the original. It works notably better on the new 3GS as the sampling rate is higher, it will happily sample and generate tones from a few 10s of Hz to 20KHz in real-time.
FFTs are a very "simple" way to divide up sound samples and produce histograms of the frequencies, it's amazing how well this can be done in such a small device. The algorithm is relatively simple and there are many open source implementations but this one is nicely packaged and perfectly designed for the iPhone.
I've bought many apps in the past that have been erased after a few days, I've had this now since the 3GS came out and I still use it regularly both as a toy and, well, er, well, as a toy. :-)
-John-
App Privacy
The developer, Andrew Smith, 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 Not Collected
The developer does not collect any data from this app.
Privacy practices may vary based on, for example, the features you use or your age. Learn More
Information
- Provider
- Andrew Smith
- Size
- 33.8 MB
- Category
- Music
- Compatibility
-
- iPhone
- Requires iOS 12.1 or later.
- iPad
- Requires iPadOS 12.1 or later.
- iPod touch
- Requires iOS 12.1 or later.
- Mac
- Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
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English, French, German, Japanese, Polish, Simplified Chinese, Swedish
- Age Rating
- 4+
- Copyright
- © Andrew Smith
- Price
- £9.99
- In-App Purchases
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- Reference Curve Files £9.99