Microphone Input Level

Skeniver · by **Skeniver** » Thu Jan 21, 2010 2:39 pm

Hi there

I was wondering how I could check the volume level from the mic... If that makes sense. IE: In a quiet room say it returns a 0, but when someone speaks it would return 10!

A thread was started here, but hasn't had much luck: http://www.anddev.org/viewtopic.php?p=25656

Basically, I want to measure a normal level and then trigger an event when there is more noise.

I have tried a little of what was posted in the mentioned thread:

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

 
AudioRecord ar;
 
    boolean running;
 
    @Override
 
    public void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
 
        setContentView(R.layout.main);
 
        running = false;
 
        int src = AudioSource.MIC;
 
        int sr = 44100;
 
        int ch = AudioFormat.CHANNEL_CONFIGURATION_DEFAULT;
 
        int af = AudioFormat.ENCODING_PCM_16BIT;
 
        try {
 
                ar = new AudioRecord(src,sr,ch,af,AudioRecord.getMinBufferSize(sr, ch, af));
 
                startListening();
 
        } catch (Exception e) {
 
                e.printStackTrace();
 
        }
 
    }
 
    public void startListening() {
 
        ar.startRecording();
 
        Thread t = new Thread() {
 
                public void run() {
 
                        int test = 2;
 
                        test++;
 
                        for (int y = 0; y < 5; y ++) {
 
                                short[] sho = new short[1];
 
                                sho[0] = 10;
 
                                int x = ar.read(sho, 256, 256);
 
                                if (x > 0)
 
                                        tHandler.sendMessage(Message.obtain(tHandler, 1));
 
                        }
 
                }
 
        };
 
        t.start();
 
    }
 
    private Handler tHandler = new Handler() {
 
        @Override
 
        public void handleMessage(Message msg) {
 
                switch (msg.what) {
 
                        case 1:
 
                                TextView tv = (TextView)findViewById(R.id.textLabel);
 
                                tv.setText("High");
 
                                ar.stop();
 
                                break;
 
                }
 
        }
 
    };
Parsed in 0.035 seconds,  using GeSHi 1.0.8.4

The values (particularly the ones used in ar.read()), are all thumb sucked. I have no clue what I was inputing or what I was expecting to get out!

Does anyone have any insight for me?

Thanks in advance
Neil

kanulo · by **kanulo** » Fri Jan 29, 2010 1:10 am

Any idea? i have the same problem.

Thanks.

stealthcopter · by **stealthcopter** » Tue Mar 30, 2010 4:23 pm

When I run the code you have here I get an error on this line

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Using java Syntax Highlighting

 
ar = new AudioRecord(src,sr,ch,af,AudioRecord.getMinBufferSize(sr, ch, af)); 
 
Parsed in 0.030 seconds,  using GeSHi 1.0.8.4

and if I check the value of

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

 
AudioRecord.getMinBufferSize(sr, ch, af)
 
Parsed in 0.033 seconds,  using GeSHi 1.0.8.4

I get -2 which clearly wont work. Not sure what's going on, I will try just putting a manual buffer size in, although I don't know what kind of size is a good idea.

Microphone Input Level

Microphone Input Level

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