add samples from NWaves repo; add DemoStereo

NWaves.DemoForms/AdaptiveFiltersForm.cs

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+using NWaves.Filters.Adaptive;
+using NWaves.Filters.Base;
+using NWaves.Signals;
+using NWaves.Signals.Builders;
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace NWaves.DemoForms
+{
+    public partial class AdaptiveFiltersForm : Form
+    {
+        DiscreteSignal _s;
+        DiscreteSignal _noise;
+
+        public AdaptiveFiltersForm()
+        {
+            InitializeComponent();
+        }
+
+        private void adaptButton_Click(object sender, EventArgs e)
+        {
+            var mu = float.Parse(muTextBox.Text);
+
+            AdaptiveFilter filter;
+
+            if (nlmsRadioButton.Checked)
+                filter = new NlmsFilter(5, mu);
+            else if (lmfRadioButton.Checked)
+                filter = new LmfFilter(5, mu);
+            else if (rlsRadioButton.Checked)
+                filter = new RlsFilter(5, mu);
+            else
+                filter = new LmsFilter(5, mu);
+
+            var a = Enumerable.Range(0, _noise.Length)
+                              .Select(i => filter.Process(_noise[i], _s[i]))
+                              .ToArray();
+
+            linePlot1.Markline = a;
+
+            weightsListBox.DataSource = new BindingList<float>(filter.Kernel);
+        }
+
+        private void generateButton_Click(object sender, EventArgs e)
+        {
+            _noise = sinRadioButton.Checked ? 
+                        new SineBuilder()
+                            .SetParameter("freq", 1000)
+                            .OfLength(1000)
+                            .SampledAt(16000)
+                            .Build()
+                        :
+                        new WhiteNoiseBuilder()
+                            .SetParameter("min", -0.5)
+                            .SetParameter("max", 0.5)
+                            .OfLength(1000)
+                            .SampledAt(16000)
+                            .Build();
+
+            var fir = new FirFilter(new[] { 0.2, 1, -0.5, 0.5, 0.9 });
+
+            _s = fir.ApplyTo(_noise);
+
+            linePlot1.Stride = 5;
+            linePlot1.Line = _s.Samples;
+        }
+    }
+}