2a:null 2b:["$","title",null,{"children":"DTMF Decoder | Jed Fox | Observable"}] 30:T1e04,DTMF = (function(t) { var e = {}; function n(o) { if (e[o]) return e[o].exports; var r = (e[o] = { i: o, l: !1, exports: {} }); return t[o].call(r.exports, r, r.exports, n), (r.l = !0), r.exports; } return ( (n.m = t), (n.c = e), (n.d = function(t, e, o) { n.o(t, e) || Object.defineProperty(t, e, { configurable: !1, enumerable: !0, get: o }); }), (n.r = function(t) { Object.defineProperty(t, "__esModule", { value: !0 }); }), (n.n = function(t) { var e = t && t.__esModule ? function() { return t.default; } : function() { return t; }; return n.d(e, "a", e), e; }), (n.o = function(t, e) { return Object.prototype.hasOwnProperty.call(t, e); }), (n.p = ""), n((n.s = 3)) ); })([ function(t, e, n) { "use strict"; Object.defineProperty(e, "__esModule", { value: !0 }); (e.dtmfFreqs = [[697, 770, 852, 941], [1209, 1336, 1477, 1633]]), (e.dtmfChars = [ ["1", "2", "3", "A"], ["4", "5", "6", "B"], ["7", "8", "9", "C"], ["*", "0", "#", "D"] ]); }, function(t, e, n) { "use strict"; Object.defineProperty(e, "__esModule", { value: !0 }); var o = (function() { function t(t, e) { for (var n = 0; n < e.length; n++) { var o = e[n]; (o.enumerable = o.enumerable || !1), (o.configurable = !0), "value" in o && (o.writable = !0), Object.defineProperty(t, o.key, o); } } return function(e, n, o) { return n && t(e.prototype, n), o && t(e, o), e; }; })(), r = n(0); var i = (function() { function t() { var e = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : {}; !(function(t, e) { if (!(t instanceof e)) throw new TypeError("Cannot call a class as a function"); })(this, t), (this.options = e); } return ( o(t, [ { key: "start", value: function(t, e) { if (!this._timer && e) { this.audioContext = new (window.AudioContext || window.webkitAudioContext)(); var n = this.audioContext.createMediaStreamSource(t), o = this.audioContext.createAnalyser(); (o.fftSize = 1024), (o.smoothingTimeConstant = 0), n.connect(o); var i, a = new Uint8Array(o.frequencyBinCount), u = this.audioContext.sampleRate / a.length / 2, s = 0, c = this.options.duration || 100, f = this.options.step || 10; this._timer = setInterval(function() { o.getByteFrequencyData(a); for (var t = 0, n = 0; n < a.length; n++) a[n] > t && (t = a[n]); var c = l(a, r.dtmfFreqs[0], u), d = l(a, r.dtmfFreqs[1], u); if (c >= 0 && d >= 0) { var h = r.dtmfChars[c][d]; i == h ? ++s > .75 * f && (e(h), (s = 0)) : (s = 0), (i = h); } }, c / f); } function l(t, e, n) { for (var o = 0, r = -1, i = 0; i < e.length; i++) { var a = Math.round(e[i] / n); t[a] > o && ((o = t[a]), (r = i)); } return r; } } }, { key: "stop", value: function() { clearInterval(this._timer), (this._timer = null), this.audioContext && ("function" == typeof this.audioContext.close && this.audioContext.close(), (this.audioContext = null)); } } ]), t ); })(); e.default = i; }, function(t, e, n) { "use strict"; Object.defineProperty(e, "__esModule", { value: !0 }); var o = (function() { function t(t, e) { for (var n = 0; n < e.length; n++) { var o = e[n]; (o.enumerable = o.enumerable || !1), (o.configurable = !0), "value" in o && (o.writable = !0), Object.defineProperty(t, o.key, o); } } return function(e, n, o) { return n && t(e.prototype, n), o && t(e, o), e; }; })(), r = n(0); var i = (function() { function t() { var e = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : {}; !(function(t, e) { if (!(t instanceof e)) throw new TypeError("Cannot call a class as a function"); })(this, t); for ( var n = new (window.AudioContext || window.webkitAudioContext)(), o = [], i = 0; i < r.dtmfFreqs[0].length; i++ ) { for ( var a = [], u = r.dtmfFreqs[0][i], s = 0; s < r.dtmfFreqs[1].length; s++ ) { var c = r.dtmfFreqs[1][s], f = {}; (f.gain1 = n.createGain()), (f.gain1.gain.value = 0), f.gain1.connect(n.destination), (f.osc1 = n.createOscillator()), (f.osc1.type = "sine"), (f.osc1.frequency.value = u), f.osc1.connect(f.gain1), (f.osc2 = n.createOscillator()), (f.osc2.type = "sine"), (f.osc2.frequency.value = c), f.osc2.connect(f.gain1), f.osc1.start(0), f.osc2.start(0), a.push(f); } o.push(a); } (this.options = e), (this.audioContext = n), (this.grid = o); } return ( o(t, [ { key: "play", value: function(t, e) { if ((e || (e = function() {}), !t)) return e(); var n = t.split(""), o = this.grid, i = this.options.duration || 100, a = this.options.pause || 40; !(function t() { var u, s, c = n.shift(); if (!c) return e(); t: for (u = 0; u < r.dtmfChars.length; u++) for (s = 0; s < r.dtmfChars[u].length; s++) if (r.dtmfChars[u][s] == c) break t; var f = o[u][s]; if (!f) return e(); (f.gain1.gain.value = 1), setTimeout(function() { (f.gain1.gain.value = 0), setTimeout(t, a); }, i); })(); } }, { key: "destory", value: function() { this.audioContext && ("function" == typeof this.audioContext.close && this.audioContext.close(), (this.audioContext = null)); } } ]), t ); })(); e.default = i; }, function(t, e, n) { "use strict"; Object.defineProperty(e, "__esModule", { value: !0 }), (e.Receiver = e.Sender = void 0); var o = i(n(2)), r = i(n(1)); function i(t) { return t && t.__esModule ? t : { default: t }; } (e.Sender = o.default), (e.Receiver = r.default); } ])31:[] 2e:{"id":"d3b6ae40fa0a339b","slug":"dtmf-decoder","title":"DTMF Decoder","thumbnail":"23c6ac2f20a63079301be3803f6325e8d0fbd99a24a45ae4b24bc249d27dc168","access_level":"public","create_time":"$D2019-09-07T16:02:40.420Z","update_time":"$D2022-11-10T20:42:17.959Z","view_time":null,"first_public_time":"$D2019-09-07T17:43:40.480Z","fork":false,"stars":1,"starred":false,"owner":{"type":"team","id":"d2030a8eee317bb7","login":"j-f1","name":"Jed Fox","avatar_url":"https://avatars-next.observableusercontent.com/d222a344a2bdf162a8495aa976e7c08179a554665edaa137ea155ef6bb38fc37","tier":"starter_2024"},"version":159,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"6a6723dba070655c","login":"j-f1","name":"Jed Fox","avatar_url":"https://avatars-next.observableusercontent.com/d222a344a2bdf162a8495aa976e7c08179a554665edaa137ea155ef6bb38fc37","tier":null}],"members":[{"type":"individual","id":"6a6723dba070655c","login":"j-f1","name":"Jed Fox","avatar_url":"https://avatars-next.observableusercontent.com/d222a344a2bdf162a8495aa976e7c08179a554665edaa137ea155ef6bb38fc37","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":4,"collection":{"id":"ec5a18f631f70b10","slug":"tools","title":"Tools","owner":{"id":"d2030a8eee317bb7","login":"j-f1","name":"Jed Fox"}},"type":"notebook","body":{"title":"DTMF Decoder","cells":[{"id":0,"value":"# DTMF Decoder","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":19,"value":"{\n const button = html`