added energy spectrogram class

src/AudioAnalysisTools/StandardSpectrograms/EnergySpectrogram.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AudioAnalysisTools.StandardSpectrograms
+{
+    using Acoustics.Tools.Wav;
+    using TowseyLibrary;
+
+    public class EnergySpectrogram : BaseSonogram
+    {
+        public EnergySpectrogram(SonogramConfig config, double[,] amplitudeSpectrogram)
+            : base(config, amplitudeSpectrogram)
+        {
+            this.Configuration = config;
+            this.FrameCount = amplitudeSpectrogram.GetLength(0);
+            this.Data = amplitudeSpectrogram;
+            this.Make(this.Data);
+        }
+
+        public EnergySpectrogram(AmplitudeSonogram sg)
+            : base(sg.Configuration)
+        {
+            this.Data = MatrixTools.SquareValues(sg.Data);
+        }
+
+        public override void Make(double[,] amplitudeM)
+        {
+            this.Data = MatrixTools.SquareValues(amplitudeM);
+        }
+    }
+}