Sound signal energy and spectrum analyzer

A spectrum analyzer for specific sound signals. The application is intended for capturing a sound signal from various sources (file, another phone, built-in microphone), calculating the sound signal spectrum using the Fast Fourier Transform, calculating the spectrum energy (RMS) for 20-30 sub-bands, analyzing it and displaying the result on screen as an image and text messages. It must be possible to save the result as a screenshot in a database, indicating the source name, date and time.

There is a somewhat more detailed specification available to clarify the expected development price.