A free app for Android, by MusicalSoundLab.
SimpleFFT is a real-time Fast Fourier Transform (FFT) analyzer that uses the microphone on your smartphone or tablet to detect low-frequency sounds, such as speech and music. It provides real-time results for sound pressure levels (SPL) in the frequency range from 300 Hz to 5 KHz.
It allows you to adjust the frequency range from 300 Hz to 5 KHz. To do this, use the slider that is displayed on the screen. The range is set to the value you want by dragging the screen. You can also change the display to the horizontal or vertical direction by dragging the screen.
To analyze the sound pressure level, tap on the graph. The level will be displayed on the screen.
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