1 /*
2  * Author: Stefan Andritoiu <stefan.andritoiu@intel.com>
3  * Copyright (c) 2015 Intel Corporation.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining
6  * a copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be
14  * included in all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 public class MicrophoneSample {
26 
27 	static {
28 		try {
29 			System.loadLibrary("javaupm_mic");
30 		} catch (UnsatisfiedLinkError e) {
31 			System.err.println("error in loading native library");
32 			System.exit(-1);
33 		}
34 	}
35 
main(String[] args)36 	public static void main(String[] args) throws InterruptedException {
37 		// ! [Interesting]
38 		short[] buffer = new short[128];
39 
40 		// Attach microphone to analog port A0
41 		upm_mic.Microphone sensor = new upm_mic.Microphone(0);
42 
43 		upm_mic.thresholdContext ctx = new upm_mic.thresholdContext();
44 		ctx.setAverageReading(0);
45 		ctx.setRunningAverage(0);
46 		ctx.setAveragedOver(2);
47 
48 		// Repeatedly, take a sample every 2 microseconds;
49 		// find the average of 128 samples; and
50 		// print a running graph of the averages
51 		while (true) {
52 			int len = sensor.getSampledWindow(2, buffer);
53 
54 			if (len != 0) {
55 				int thresh = sensor.findThreshold(ctx, 30, buffer);
56 				sensor.printGraph(ctx);
57 				if (thresh != 0) {
58 					System.out.println("---Threshold reached---  " + ctx.getRunningAverage() + "  "
59 							+ ctx.getAverageReading());
60 				}
61 			}
62 		}
63 		// ! [Interesting]
64 	}
65 }