I Want To Check The Loudness Of Voice In Android

I am developing an application where I have to detect the loudness of voice. Means some on shouts on the mobile and it will show the loudness level on the screen. Which API can be

Solution 1:

Look at http://developer.android.com/reference/android/media/AudioRecord.html

When you read the buffer the byte values will represent the amplitude. The higher the byte value the louder the sound.

Here is a scaled-down version of something I used in an app I wrote a while back:

Add this to your mainifest.xml <uses-permission android:name="android.permission.RECORD_AUDIO" />

soundlevel.xml

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical" ><ToggleButtonandroid:id="@+id/togglebutton_record"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="ToggleButton" /><ProgressBarandroid:id="@+id/progressbar_level"style="?android:attr/progressBarStyleHorizontal"android:layout_width="match_parent"android:layout_height="wrap_content" /></LinearLayout>

SoundLevel.java

import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.widget.CompoundButton;
import android.widget.ProgressBar;
import android.widget.ToggleButton;

publicclassSoundLevelextendsActivity {

    privatestaticfinalintsampleRate=11025;
    privatestaticfinalintbufferSizeFactor=10; 

    private AudioRecord audio;
    privateint bufferSize;

    private ProgressBar level;

    privateHandlerhandler=newHandler();

    privateintlastLevel=0;

    @OverridepublicvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.soundlevel);

        level = (ProgressBar) findViewById(R.id.progressbar_level);

        level.setMax(32676);

        ToggleButtonrecord= (ToggleButton) findViewById(R.id.togglebutton_record);

        record.setOnCheckedChangeListener(newCompoundButton.OnCheckedChangeListener() {

            publicvoidonCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stubif (isChecked) {
                    bufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT) * bufferSizeFactor; 

                    audio = newAudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);

                    audio.startRecording();

                    Threadthread=newThread(newRunnable() {
                        publicvoidrun() {
                            readAudioBuffer();
                        }     
                      });

                    thread.setPriority(Thread.currentThread().getThreadGroup().getMaxPriority());

                    thread.start();

                    handler.removeCallbacks(update);
                    handler.postDelayed(update, 25);

                } elseif (audio != null) {
                    audio.stop();
                    audio.release();
                    audio = null;
                    handler.removeCallbacks(update);
                }

            }
        });
    }

    privatevoidreadAudioBuffer() {

        try {
            short[] buffer = newshort[bufferSize];

            int bufferReadResult;

            do {

                bufferReadResult = audio.read(buffer, 0, bufferSize);

                for (inti=0; i < bufferReadResult; i++){

                    if (buffer[i] > lastLevel) {
                        lastLevel = buffer[i];  
                    }

                }

            } while (bufferReadResult > 0 && audio.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING);

            if (audio != null) {
                audio.release();
                audio = null;
                handler.removeCallbacks(update);

            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    privateRunnableupdate=newRunnable() {

        publicvoidrun() {

            SoundLevel.this.level.setProgress(lastLevel);

            lastLevel *= .5;

            handler.postAtTime(this, SystemClock.uptimeMillis() + 500);

        }

    };
}