amplitude

I was wondering if someone could point me to a good tutorial or show me how to graph the amplitude from a byte array. The audio format I am using is: U LAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame. It sounds like you are interested in a short term smoothed RMS amplitude measurement. Usually to do this you take a rectified version of the input signal, and then apply a low pass filter to this, e.g. x1 = abs(x); // x2 = rectified input signal x2 = k * x2 + (1 - k) * x1; // simple single pole low pass recursive filter x2 is the amplitude of the signal x. k is a factor < 1.0 which determines the time

I know there are some similar questions here, but most of them are concerning generating waveform images , which is not what I want. My goal is to generate a waveform visualization for an audio file, similar to SoundCloud, but not an image. I'd like to have the max amplitude data for each second (or half second) of an audio clip in an array. I could then use this data to create a CSS-based visualization. Ideally I'd like to get an array that has all the amplitude values for each second as a percentage of the maximum amplitude of the entire audio file. Here's an example: [ 0.0, # Relative max

I'm trying to make an app that records sound for a second and then reads the maximum amplitude from the recorded sound. This is what I have so far but my app crashes and I can't figure out why. This is my second activity, which I'm calling from my first after I press a "Record" button. The app crashes on my emulator and on my phone. package radu.soundSampler; import java.io.IOException; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.widget.TextView; import android.media.MediaRecorder; public class DisplayMessageActivity extends Activity {