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Eddie Kim
Michael
parent
65dd203ab4
commit
82a505344c
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const morseToAlphabet = new Map([
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["12", "A"],
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["2111", "B"],
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["2121", "C"],
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["211", "D"],
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["1", "E"],
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["1121", "F"],
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["221", "G"],
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["1111", "H"],
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["11", "I"],
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["1222", "J"],
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["212", "K"],
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["1211", "L"],
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["22", "M"],
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["21", "N"],
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["222", "O"],
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["1221", "P"],
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["2212", "Q"],
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["121", "R"],
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["111", "S"],
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["2", "T"],
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["112", "U"],
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["1112", "V"],
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["122", "W"],
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["2112", "X"],
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["2122", "Y"],
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["2211", "Z"],
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["12222", "1"],
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["11222", "2"],
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["11122", "3"],
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["11112", "4"],
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["11111", "5"],
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["21111", "6"],
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["22111", "7"],
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["22211", "8"],
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["22221", "9"],
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["22222", "0"],
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]);
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class Decoder {
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constructor() {
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this.lastLetter = '';
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this.decodeArray = '';
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this.unit = 80; // adjustment: short dit reduces, long dah lengthens
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this.keyStartTime = null;
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this.keyEndTime = null;
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this.spaceTimer = null;
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this.farnsworth = 3;
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}
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keyOn() {
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clearTimeout(this.spaceTimer);
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this.keyStartTime = Date.now();
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//var pauseDuration = (this.keyEndTime) ? this.keyStartTime - this.keyEndTime : 0;
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//if (pauseDuration > this.unit + (this.unit/10)) { // end sequence and decode letter
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//this.registerLetter();
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//}
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}
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keyOff() {
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this.keyEndTime = Date.now();
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var keyDuration = (this.keyStartTime) ? this.keyEndTime - this.keyStartTime : 0;
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if (keyDuration < this.unit) {
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// reduce unit based on short dit
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this.unit = (keyDuration + this.unit) / 2;
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this.registerDit();
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} else if (keyDuration > this.unit * 3) {
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// lengthen unit based on long dah
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this.unit = ((keyDuration / 3) + this.unit) / 2;
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this.registerDah();
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} else {
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var ditAndDahThreshold = (this.unit * 2);
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if (keyDuration >= ditAndDahThreshold) {
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this.registerDah();
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} else {
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this.registerDit();
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}
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}
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let spaceTime = this.unit * this.farnsworth;
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this.spaceTimer = setTimeout(() => { // end sequence and decode letter
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this.updateLastLetter(this.morseToLetter(this.decodeArray));
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this.decodeArray = '';
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}, spaceTime, "keyOff");
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}
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registerDit() {
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this.decodeArray += '1';
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}
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registerDah() {
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this.decodeArray += '2';
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}
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updateLastLetter(letter) {
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updateCurrentLetter(letter);
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this.lastLetter = letter;
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//console.log(this.lastLetter);
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}
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morseToLetter(sequence) {
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var letter = morseToAlphabet.get(sequence);
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if (letter) {
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return letter;
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} else {
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return '*';
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}
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}
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calculateWpm() {
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return 60000 / (this.unit * 50);
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}
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setFarnsworth(farnsworth) {
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this.farnsworth = farnsworth;
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}
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}
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class Keyer {
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constructor(sndr, decoder) {
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this.sndr = sndr; // Sounder instance
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this.decoder = decoder; // Decoder instance
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// Using [ and ] for dits and dahs respectively for compatibility with the vband usb interface
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this.ditKey1 = 'ControlLeft';
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this.dahKey1 = 'ControlRight';
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this.ditKey2 = 'BracketLeft';
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this.dahKey2 = 'BracketRight';
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this.wpm = 20;
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this.unit = 60; // length of dit in milliseconds; 60 is 20wpm
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this.mode = 2; // 1: straight key, 2: iambicA, 3: iambicB, 4: ultimatic
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this.tone = 550;
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this.queue = [];
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this.ditKeyState = 0;
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this.dahKeyState = 0;
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this.lastKey = null;
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this.ditStreak = 0;
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this.dahStreak = 0;
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this.streak = 0;
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this.ditStart = null;
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this.ditStop = null;
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this.dahStart = null;
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this.dahStop = null;
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this.sending = false;
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this.lastSendTimestamp = null;
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this.oscillatorTimer = setInterval(() => {
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this.oscillate();
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}, 0);
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}
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setWpm(wpm){
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this.wpm = wpm;
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this.unit = 60000 / (wpm * 50) // based on the PARIS method 60 seconds / 50 elements per word * WPM
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this.decoder.unit = this.unit;
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}
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setMode(mode){
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this.mode = mode;
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}
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setTone(tone){
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this.tone = tone;
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}
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sendSignal() {
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this.sending = true;
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//console.log('startSignal');
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if (restartAudioNeeded()) {
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restartAudio();
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}
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this.sndr.setTone(this.tone);
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this.sndr.on();
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this.decoder.keyOn();
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}
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stopSignal() {
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//console.log('stopSignal');
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this.sndr.off();
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this.decoder.keyOff();
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this.lastSendTimestamp = Date.now();
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setTimeout(() => {
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this.sending = false;
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}, this.unit);
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}
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press(event, down, mode=this.mode) {
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if (mode > 1 && event.code != this.ditKey1 && event.code != this.dahKey1 && event.code != this.ditKey2 && event.code != this.dahKey2) return;
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if (mode == 1) {
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if (down) {
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if (restartAudioNeeded()) {
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restartAudio();
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}
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this.sndr.setTone(this.tone);
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this.sndr.on();
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this.decoder.keyOn();
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} else {
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this.sndr.off();
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this.decoder.keyOff();
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}
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} else if (mode > 1) {
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//console.log(key);
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if (event.code == this.ditKey1 || event.code == this.ditKey2) {
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if (down) { // dit key down
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this.ditKeyState = 1;
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this.ditStart = Date.now()
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} else { // dit key up
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this.ditKeyState = 0;
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this.ditStop = Date.now()
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}
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}
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if (event.code == this.dahKey1 || event.code == this.dahKey2) {
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if (down) { // dah key down
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this.dahKeyState = 1;
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this.dahStart = Date.now()
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} else { // dah key up
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this.dahKeyState = 0;
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this.dahStop = Date.now()
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}
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}
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}
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}
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processQueue() {
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//console.log('processQueue');
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if (!this.sending && this.queue.length) {
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this.lastKey = this.queue.shift();
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var signalLength = (this.lastKey == 1) ? this.unit : this.unit * 3;
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this.sendSignal();
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setTimeout(() => {
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this.stopSignal();
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}, signalLength);
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}
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}
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oscillatev1() {
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if (!this.ditKeyState && !this.dahKeyState) {
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this.queue = [];
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}
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if (this.ditKeyState) {
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if (this.queue.length == 0) {
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if (!this.dahKeyState && !this.sending || this.lastKey == 2) {
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this.queue.push(1);
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}
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}
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}
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if (this.dahKeyState) {
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if (this.queue.length == 0) {
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if (!this.ditKeyState && !this.sending || this.lastKey == 1) {
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this.queue.push(2);
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}
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}
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}
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if (!this.sending && Date.now() - this.lastSendTimestamp > this.unit) {
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this.processQueue();
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}
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}
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oscillatev2() {
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if (this.mode == 2 && !this.ditKeyState && !this.dahKeyState) { // Iambic B doesn't clear the queue
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if (this.streak > 1) {
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//console.log(this.streak + " queue: " + this.queue[0]);
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this.queue = [];
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}
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this.streak = 0;
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}
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if (this.ditKeyState) {
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if (this.queue.length < 1) {
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if (!this.sending || this.lastKey == 2) {
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this.queue.push(1);
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if (this.lastKey == 2 && this.dahKeyState) {
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this.streak++;
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} else {
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this.streak = 0;
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}
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}
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}
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}
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if (this.dahKeyState) {
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if (this.queue.length < 1) {
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if (!this.sending || this.lastKey == 1) {
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this.queue.push(2);
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if (this.lastKey == 1 && this.ditKeyState) {
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this.streak++;
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} else {
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this.streak = 0;
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}
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}
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}
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}
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if (!this.sending && Date.now() - this.lastSendTimestamp >= this.unit) {
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this.processQueue();
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}
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}
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oscillatev3() {
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if (this.mode == 2 && !this.ditKeyState && !this.dahKeyState && this.queue.length) { // Iambic B doesn't clear the queue
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if ((this.ditStreak && this.queue[0] == 1) || (this.dahStreak && this.queue[0] == 2)) {
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console.log("ditStreak: "+this.ditStreak+" dahStreak: "+this.dahStreak+" queue: "+this.queue[0]);
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this.queue = [];
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}
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//console.log("NO CLEAR ditStreak: "+this.ditStreak+" dahStreak: "+this.dahStreak+" queue: "+this.queue[0]);
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this.ditStreak = 0;
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this.dahStreak = 0;
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}
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if (this.ditKeyState) {
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if (!this.queue.length) {
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if (!this.sending || this.lastKey == 2) {
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this.queue.push(1);
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this.ditStreak++;
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}
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} else if (!this.dahKeyState && this.queue[0] == 2) { // dah was canceled. Replace in queue
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this.queue[0] = 1;
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this.dahStreak = 0;
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this.ditStreak++;
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}
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}
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if (this.dahKeyState) {
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if (!this.queue.length) {
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if (!this.sending || this.lastKey == 1) {
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this.queue.push(2);
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this.dahStreak++;
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}
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} else if (!this.ditKeyState && this.queue[0] == 1) { // dit was canceled. Replace in queue
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this.queue[0] = 2;
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this.ditStreak = 0;
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this.dahStreak++;
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}
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}
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if (!this.sending && Date.now() - this.lastSendTimestamp >= this.unit) {
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this.processQueue();
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}
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}
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oscillate() {
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if (this.mode == 2 && !this.ditKeyState && !this.dahKeyState && this.queue.length) {
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if (this.queue[0] == 1) { // Dit is in the queue
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if (this.ditStart < this.dahStart || this.ditStop - this.ditStart > this.unit * 4) {
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this.queue.pop();
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}
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} else { // Dah is in the queue
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if (this.dahStart < this.ditStart || this.dahStop - this.dahStart > this.unit * 2) {
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this.queue.pop();
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}
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}
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}
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if (this.ditKeyState) {
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if (this.queue.length == 0) {
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if ((!this.dahKeyState && !this.sending) || this.lastKey == 2) {
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this.queue.push(1);
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}
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} else { // dah key was lifted and is still in queue
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if (this.mode == 2 && !this.dahKeyState && this.dahStart < this.ditStart && this.queue[0] == 2) {
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this.queue.pop();
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}
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}
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}
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if (this.dahKeyState) {
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if (this.queue.length == 0) {
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if ((!this.ditKeyState && !this.sending) || this.lastKey == 1) {
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this.queue.push(2);
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}
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} else { // dit key was lifted and is still in queue
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if (this.mode == 2 && !this.ditKeyState && this.ditStart < this.dahStart && this.queue[0] == 1) {
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this.queue.pop();
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}
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}
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}
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if (!this.sending && Date.now() - this.lastSendTimestamp > this.unit) {
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this.processQueue();
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}
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}
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}
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