tinnitus.html

   1 <!-- This file is part of tinnitus. -->
   2
   3 <!-- tinnitus is free software: you can redistribute it and/or modify it -->
   4 <!-- under the terms of the GNU General Public License as published by the -->
   5 <!-- Free Software Foundation, either version 3 of the License, or (at your -->
   6 <!-- option) any later version. -->
   7
   8 <!-- tinnitus is distributed in the hope that it will be useful, but WITHOUT -->
   9 <!-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or -->
  10 <!-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -->
  11 <!-- for more details. -->
  12
  13 <!-- You should have received a copy of the GNU General Public License -->
  14 <!-- along with tinnitus. If not, see <https://www.gnu.org/licenses/>. -->
  15
  16 <!DOCTYPE html>
  17 <html>
  18   <head>
  19     <meta charset="utf-8">
  20     <title>Tinnitus</title>
  21     <script>
  22       function innerhtml(el, txt)
  23       {
  24         if (txt == undefined){
  25           return document.getElementById(el).innerHTML;
  26         }
  27         else document.getElementById(el).innerHTML = txt;
  28       }
  29
  30       function value(el, v)
  31       {
  32         if (v == undefined){
  33           return document.getElementById(el).value;
  34         }
  35         else document.getElementById(el).innerHTML = v;
  36       }
  37
  38       function fromradio(radio)
  39       {
  40         var l = document.getElementsByName(radio);
  41         for(var i=0; i<l.length; i++){
  42           if(l[i].checked){
  43             return l[i].value;
  44           }
  45         }
  46       }
  47   function tune()
  48   {
  49     try {
  50       osc.frequency.value = value("u");
  51     }
  52     catch{}
  53     return 0;
  54   }
  55   function volume()
  56   {
  57     try {
  58       gainNode.gain.value = value("s");
  59     }
  60     catch{}
  61     return 0;
  62   }
  63   function stopit()
  64   {
  65     try {osc.stop();}
  66     catch{}
  67     return 0;
  68   }
  69     </script>
  70   </head>
  71   <body>
  72     <style>
  73       input {
  74           height: 18px;
  75           width: 5.0%;
  76           font-size: 1.0em;
  77           background-color: magenta;
  78       }
  79     </style>
  80     <h3>Tinnitus emits wave with gain and frequency</h3>
  81     <input onchange="volume()"type="number" id="s" value=0.0> Gain [0.0 - 1.0]
  82 </input>
  83 <input onchange="tune()" type="number" id="u" value=440.0> Frequency [Hz]
  84 </input>
  85 <h3>Select your favorite pulse shape</h3>
  86 <input onchange="stopit()" type="radio" name="shape" value="silence" checked> Silence
  87 </input>
  88 <input onchange="restart()" type="radio" name="shape" value="sine"> Sine
  89 </input>
  90 <input onchange="restart()" type="radio" name="shape" value="triangle"> Triangle
  91 </input>
  92 <input onchange="restart()" type="radio" name="shape" value="sawtooth"> Sawtooth
  93 </input>
  94 <input onchange="restart()" type="radio" name="shape" value="square">Square
  95 </input>
  96 <input onchange="restart()" type="radio" name="shape" value="noise">Noise
  97 </input>
  98 <br><br>
  99 <script>
 100   function restart()
 101   {
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 104     try {
 105       osc.stop();
 106       delete ctx;
 107     }
 108     catch {}
 109     ctx = new AudioContext();
 110     osc = ctx.createOscillator();
 111     var type = fromradio("shape");
 112     if( type != "noise"){
 113       osc.type = type;
 114     }
 115     else {
 116       const wave = ctx.createPeriodicWave(real, imag);
 117       osc.setPeriodicWave(wave);
 118     }
 119     gainNode = ctx.createGain();
 120     osc.connect(gainNode);
 121     gainNode.connect(ctx.destination);
 122     osc.frequency.value = value("u");
 123     gainNode.gain.value = value("s");
 124     osc.start();
 125     return 0;
 126   }
 127 </script>
 128 </body>
 129 </html>