commit 9b743f002b62dde31a3a9697c7fd34aac0d8071a
parent c70179e7bc3756da5ec9170e34a503e59f9e49ef
Author: Yuval Langer <yuvallangerontheroad@gmail.com>
Date: Sun, 28 Jun 2020 21:20:08 +0300
Add an annoying audio api page.
Diffstat:
1 file changed, 48 insertions(+), 0 deletions(-)
diff --git a/html/annoying-sawtooth-alarm.html b/html/annoying-sawtooth-alarm.html
@@ -0,0 +1,48 @@
+<!doctype html>
+<html>
+ <head>
+ <meta charset="utf-8">
+ <script type="text/javascript">
+'use strict';
+
+
+(function() {
+ function main() {
+ let f = 440;
+ let v = 1;
+ let audio = new window.AudioContext;
+
+ let oscillator = audio.createOscillator();
+
+ oscillator.type = 'sine';
+ oscillator.frequency.setValueAtTime(f, audio.currentTime);
+ oscillator.connect(audio.destination);
+ oscillator.start();
+
+ function changeFrequency() {
+ //alert(f);
+ if ((f > 880) || (f < 440)) {
+ f = Math.min(Math.max(f, 440), 880);
+ v *= -1;
+ };
+
+ f += 10 * v;
+
+ oscillator.type = 'sawtooth';
+ oscillator.frequency.setValueAtTime(f, audio.currentTime);
+ oscillator.connect(audio.destination);
+ //oscillator.start();
+
+ window.setTimeout(changeFrequency, 10);
+ };
+
+ window.setTimeout(changeFrequency, 10);
+ };
+
+ window.addEventListener('load', main);
+})();
+ </script>
+ </head>
+ <body>
+ </body>
+</html>
