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Nexus S 4g Audio recorder frequency

package receive.ultrasound;

 

import java.io.BufferedOutputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import android.app.Activity;

import android.media.AudioFormat;

import android.media.AudioRecord;

import android.media.MediaRecorder;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

 

public class Beep_Beep_ReceiverActivity extends Activity{

    private int min_buff;

    private int len=0;

 

    File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/demo.pcm");

 

    AudioRecord record = null;

 

     Handler handler = new Handler();

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

 

 

        final Button buttonStart = (Button) findViewById(R.id.button1);

        final Button buttonStop = (Button) findViewById(R.id.button2);

 

        buttonStart.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {

            Toast.makeText(getApplicationContext(), "button1 clicked!", 50).show();

            startDownload();

        }

    });

 

        buttonStop.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                Toast.makeText(getApplicationContext(), "button1 clicked!", 50).show();

                stopDownload();

            }

        });

 

    }

 

   #start download function:

 

    public void startDownload(){

 

        OutputStream os = null;

        try {

            os = new FileOutputStream(file);

        } catch (FileNotFoundException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

                DataOutputStream dos = new DataOutputStream(os);

 

        try {

            /*       Create a DataOuputStream to write the audio data into the saved file.*/

 

 

 

 

                  min_buff = AudioRecord.getMinBufferSize(8000, AudioFormat.CHANNEL_CONFIGURATION_MONO,

                        AudioFormat.ENCODING_PCM_16BIT);

 

                  if( min_buff == AudioRecord.ERROR_BAD_VALUE )

                        Log.e( "ram", "hardware not supported for this configuration" );

 

                  if( min_buff == AudioRecord.ERROR )

                        Log.e( "ram", "Bad Value for "minBufferSize", implementation was unable to query the hardware for its output properties" );

 

 

     #This is where i give the sample rate.            

 

         AudioRecord record = new AudioRecord(MediaRecorder.AudioSource.MIC, 8000,

                        AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, min_buff);

 

 

 

 

 

                  byte[] buffer = new byte[min_buff * 10];

                  byte[] temp_buffer = new byte[min_buff];

 

                  record.startRecording();

 

 

                  while (len < (min_buff * 10)) {

                         int bufferReadResult = record.read(temp_buffer, 0, min_buff);

                         for (int i = 0; i < bufferReadResult; i++)

                                    dos.writeByte(temp_buffer[i]);

                         len += min_buff;

                  }

 

 

              //    record.stop();

              //  dos.close();

        }catch (Exception e) {

 

        }

 

 

    }

 

    public void stopDownload(){

 

       System.exit(0);      

    }

 

}