RealTimeSound (jp.gr.java_conf.tetratank.realtimesound) on Google Play
New v2.0.1 has functions to display maximum and second peak frequency of spectrum, and you can stop and play the display by pushing button.RealTimeSound displays the following three sound information.* Sound wave detected by microphone input plug* Sound spectrum (FFT is applied to analyze a sound wave)* Sound pressure level (dB)you can do the following on the graph of sound wave and spectrum.* Shift the display area by dragging* Zoom in and out by pinching (or push the buttons on the right of the screen)The button to restore the graph area is displayed .