FFT is a high-resolution audio analysis tool available as an in-app purchase in AudioTools. It uses the Fast Fourier Transform (see below) to analyze incoming audio, and displays a very detailed graph of amplitude vs. frequency. This application has been designed for acoustics work, and so the FFT 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.
- FFT size from 4096 to 32k (on newer iOS devices)
- Difference mode to compare 2 graphs
- Peak frequency readout in real time
- Signal generator can generate sine waves, square waves, white noise, and pink noise
- Cursor move your finger across the screen to get a cursor to read out exact dB levels and frequencies
- Touch-GUI use pinch gestures to scale the graph and zoom in on frequencies
- Double-tap to normalize the graph to full range, and fit the entire graph on the screen
- Both full range (20-20kHz) and low range (5Hz to 3100Hz) are available
- Overall dB display
- Save the graph image to your photo roll to include in a report
- Export the data in XLS format
- FFT windowing available
