A free app for Android, by PC Mehanik.

This application analyzes the sound pressure level (SPL) of the audio signal. It can detect and identify a wide range of frequencies from approximately 20 Hz to 20 kHz. The application uses an FFT algorithm to calculate the frequency spectrum in real time.

It is a tool to analyze the audio signal and detect the sound spectrum in real time using FFT.

It also includes a function to calibrate the device for a given frequency range.

It can be used to analyze all types of audio signals such as music, speech, noise, etc.

It can be used to analyze the sound pressure level (SPL) of the audio signal.