Merge pull request #9 from Justin-Johnson/svf-magnitude

Implemented SVF magnitude (and phase), + refactoring

ReSpectrum.jsfx

@@ -5,7 +5,7 @@ Version: v1.0.1
 
 The MIT License (MIT)
 
-Copyright (c) 2020 Justin Johnson
+Copyright (c) 2021 Justin Johnson
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

firhalfband.jsfx-inc

@@ -1,46 +1,68 @@
 desc:FIR Filter Half Band
 /*
- * FIR Half band filter
- * Copyright (C) 2018 Justin Johnson
- * License: LGPL - http://www.gnu.org/licenses/lgpl.html
- *
- * Reference: http://www.labbookpages.co.uk/audio/firWindowing.html
- *
- * This filter is designed to do one job and do it well and as fast as JSFX can muster (almost).
- *
- *  It's a half band low pass 65 tap FIR filter meant for use with oversampling x2.
- *
- *  For 44.1Khz: At 88.2kHz it filters out frequencies after 22050hz which gets rid of aliasing introduced
- *  by zero filling when oversampling.
- *
- *  The filter is steep and uses the following vars (44.1kHz):
- *
- *  Fa = 0
- *  Fb = 22050
- *  length = 65
- *  Fs = 88200
- *  Att = 96db
- *
- *  From here:
- *
- *    http://arc.id.au/FilterDesign.html
- *
- *  Example:
- * 
- *  // DAW sample rate 44.1kHz (left channel given, same for right channel)
- *  // Oversampling x 2
- *
- *  @init
- *  firL.init_FIR_filter_44100();
- *
- *  @sample
- *  y0 = left.do_process(spl0);   // Apply application filters and other processing etc
- *  y1 = left.do_process(0);      // Zero padding
- *
- *  spl0 = firL.do_FIR_filter(y0) * 2;  // First fir application
- *  firL.do_FIR_filter(y1);             // Discard (crude decimation, only do this if you're
- *                                      // not generating harmonics, ie. clean EQ)
- *
+  FIR Half band filter
+
+  The MIT License (MIT)
+
+  Copyright (c) 2021 Justin Johnson
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+
+  ---
+
+  Reference: http://www.labbookpages.co.uk/audio/firWindowing.html
+
+  This filter is designed to do one job and do it well and as fast as JSFX can muster (almost).
+
+   It's a half band low pass 65 tap FIR filter meant for use with oversampling x2.
+
+   For 44.1Khz: At 88.2kHz it filters out frequencies after 22050hz which gets rid of aliasing introduced
+   by zero filling when oversampling.
+
+   The filter is steep and uses the following vars (44.1kHz):
+
+   Fa = 0
+   Fb = 22050
+   length = 65
+   Fs = 88200
+   Att = 96db
+
+   From here:
+
+     http://arc.id.au/FilterDesign.html
+
+   Example:
+
+   // DAW sample rate 44.1kHz (left channel given, same for right channel)
+   // Oversampling x 2
+
+   @init
+   firL.init_FIR_filter_44100();
+
+   @sample
+   y0 = left.do_process(spl0);   // Apply application filters and other processing etc
+   y1 = left.do_process(0);      // Zero padding
+
+   spl0 = firL.do_FIR_filter(y0) * 2;  // First fir application
+   firL.do_FIR_filter(y1);             // Discard (crude decimation, only do this if you're
+                                       // not generating harmonics, ie. clean EQ)
+
  */
 
 @init