The calculator requires you to input any two of the following three parameters: wave speed, frequency (or wave period) and wavelength. Once you input two parameters, the calculator will calculate the remaining one and display the result.

Calculation of frequency and wavelength change for a moving source

Predicting the height of the waves depending on the wind strength

The calculator displays the waveform of the input audio file fragment.

The article describes how to use input and output files in Planetcalc calculators