Added support for f32 bin files, and other tweaks.

Author: macaba

source/NSD.UI/MainWindow.axaml

@@ -120,6 +120,7 @@
 									<ComboBoxItem>131072</ComboBoxItem>
 									<ComboBoxItem>262144</ComboBoxItem>
 									<ComboBoxItem>524288</ComboBoxItem>
+									<ComboBoxItem>1048576</ComboBoxItem>
 								</ComboBox>
 							</StackPanel>
 							<StackPanel x:Name="spLinearStacking" Orientation="Horizontal" Margin="6,0,0,0" IsVisible="{Binding AlgorithmLinStack}">
@@ -139,6 +140,7 @@
 									<ComboBoxItem>131072</ComboBoxItem>
 									<ComboBoxItem>262144</ComboBoxItem>
 									<ComboBoxItem>524288</ComboBoxItem>
+									<ComboBoxItem>1048576</ComboBoxItem>
 								</ComboBox>
 								<Label VerticalAlignment="Stretch" VerticalContentAlignment="Center">Minimum FFT length</Label>
 								<ComboBox SelectedIndex="2" SelectedItem="{Binding SelectedLinearStackingMinLengthItem, Mode=OneWayToSource}" IsEnabled="{Binding Enabled}" HorizontalAlignment="Stretch">
@@ -155,6 +157,7 @@
 									<ComboBoxItem>65536</ComboBoxItem>
 									<ComboBoxItem>131072</ComboBoxItem>
 									<ComboBoxItem>262144</ComboBoxItem>
+									<ComboBoxItem>524288</ComboBoxItem>
 								</ComboBox>
 							</StackPanel>
 						</StackPanel>

source/NSD.UI/MainWindow.axaml.cs

@@ -46,7 +46,7 @@ public async void BtnSearch_Click(object sender, RoutedEventArgs e)
                 viewModel.InputFilePaths.Add(file);
                 viewModel.InputFileNames.Add(Path.GetFileName(file));
             }
-            files = Directory.EnumerateFiles(viewModel.ProcessWorkingFolder, "*.bin");      // Hidden functionality that supports F32 bin files
+            files = Directory.EnumerateFiles(viewModel.ProcessWorkingFolder, "*.f32");      // Hidden functionality that supports F32 bin files
             foreach (var file in files)
             {
                 viewModel.InputFilePaths.Add(file);
@@ -156,7 +156,7 @@ await Task.Run(() =>
                             fileParseFinish = DateTimeOffset.UtcNow;
                             break;
                         }
-                    case ".bin":
+                    case ".f32":
                         {
                             fileParseStart = DateTimeOffset.UtcNow;
                             await Task.Run(() =>

source/NSD/NSD.cs

@@ -8,6 +8,7 @@ public static Spectrum Linear(ReadOnlyMemory<double> input, double sampleRate, i
         {
             //var window = Windows.HFT90D(outputWidth, out double optimumOverlap, out double NENBW);
             var window = Windows.FTNI(outputWidth, out double optimumOverlap, out double NENBW);
+            //var window = Windows.HFT95(outputWidth, out double optimumOverlap, out double NENBW);
             // Switched from HFT90D to FTNI
             // FTNI has the useful feature where Math.Ceiling(NENBW) is 1 less than most flaptop windows,
             // therefore showing one more usable frequency point at the low frequency end of the spectrum.
@@ -33,7 +34,7 @@ public static Spectrum Linear(ReadOnlyMemory<double> input, double sampleRate, i
             ConvertWorkSpectrumToAverageVSDInPlace(workSpectrum, spectrumCount);
             var nsd = Spectrum.FromValues(workSpectrum, sampleRate, spectrumCount);
             //nsd.TrimDC();     // Don't need to trim DC if trimming start/end
-            nsd.TrimStartEnd((int)Math.Ceiling(NENBW));
+            nsd.TrimStart((int)Math.Ceiling(NENBW * 2));
             return nsd;
         }