The screen i used is http://www.amazon.co.uk/Touch-Screen-Designed-Raspberry-Model/dp/B00UV78E9Q/ref=sr_1_14?ie=UTF8&qid=1432902157&sr=8-14&keywords=raspberry+pi+2 I would like to know how to input the audio signal into the raspberry pi and how to show the spectrum of the signals at the same time in the screen. Any programming or extra components i need? Please help me. Thank you.
Now I determine to use a USB audio input the sound signals. But how could the spectrum or other graphs of the signals display on the screen? Much thanks.