From ea51a0dd4392b91256ad211d901f71c1e4dcd95b Mon Sep 17 00:00:00 2001
From: Alexander James Wallar <aw204@st-andrews.ac.uk>
Date: Tue, 21 Jan 2014 18:03:21 -0500
Subject: [PATCH] Can now determine amplitude

---
 .../com/locaudio/signal/WaveProcessing.java   | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/app/Locabean/src/com/locaudio/signal/WaveProcessing.java b/app/Locabean/src/com/locaudio/signal/WaveProcessing.java
index c412546..9155745 100644
--- a/app/Locabean/src/com/locaudio/signal/WaveProcessing.java
+++ b/app/Locabean/src/com/locaudio/signal/WaveProcessing.java
@@ -8,9 +8,32 @@ public static float amplitudeToSoundPressureLevel(float amplitude) {
 		return (float) (20 * Math.log(amplitude) / Math.log(10));
 	}
 
+	public static boolean isPeak(int prevVal, int curVal, int nextVal) {
+		if (prevVal <= curVal && nextVal <= curVal) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+
 	public static float determineAverageAmplitude(Wave wave) {
 
-		return 0;
+		short threshold = 100;
+		int runningSum = 0;
+		int count = 0;
+
+		short[] amplitudes = wave.getSampleAmplitudes();
+
+		for (int i = 1; i < amplitudes.length - 1; i++) {
+			if (isPeak(amplitudes[i - 1], amplitudes[i], amplitudes[i + 1])) {
+				if (amplitudes[i] > threshold) {
+					runningSum += amplitudes[i];
+					count++;
+				}
+			}
+		}
+		
+		return (float) runningSum / (float) count;
 	}
 
 	public static float determineAverageSoundPressureLevel(Wave wave) {