How to draw the spectrogram from data the stft?

Question

I have calculated stft(short time fourier transform) data. That is the number of the form a+bi. how would these can be drawn the spectrogram of frequency vs time, what function in java can I use.

how to draw up like. I need one solution.

Answer 1

The Java SE libraries do not cover this sort of thing. You need to:

• identify a 3rd-party Java library that provides scientific graphing,

• identify a non-Java application that you can run to generate an image that you can embed in your Java app's output; e.g. run it using Runtime.exec(...), or

• figure out how to render the image using the Java 2D libraries; i.e. by painting the pixels ...

Approaches 1 and 2 require you to do some research (e.g. Google). Approach 3 requires you to understand the Java 2D graphics libraries, and code the solution for yourself.