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<!DOCTYPE html> |
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<html> |
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<head> |
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<title>Широкополосный FM и ELF Demodulator</title> |
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<style> |
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body { font-family: Arial, sans-serif; } |
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#controls { margin-bottom: 20px; } |
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</style> |
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</head> |
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<body> |
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<div id="controls"> |
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<label for="frequencySlider">Частота (Hz): </label> |
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<input type="range" id="frequencySlider" min="3" max="20000" step="1" value="1000"> |
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<span id="frequencyValue">1000</span> Hz |
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<button id="toggleAudio">Включить звук</button> |
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<button id="toggleELF">Включить ELF режим</button> |
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</div> |
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<canvas id="elfCanvas" width="800" height="150" style="border:1px solid #000000;"></canvas> |
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<script> |
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let audioContext; |
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let analyser; |
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let microphone; |
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let canvas; |
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let canvasCtx; |
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let scriptProcessor; |
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let prevPhase = 0; |
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let demodulatedSignal = []; |
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let gainNode; |
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let isAudioEnabled = false; |
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let isELFMode = false; |
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let centerFrequency = 1000; |
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let elfBuffer = []; |
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let elfCanvas; |
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let elfCtx; |
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function startAudioAnalysis() { |
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audioContext = new (window.AudioContext || window.webkitAudioContext)(); |
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analyser = audioContext.createAnalyser(); |
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analyser.fftSize = 2048; |
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scriptProcessor = audioContext.createScriptProcessor(1024, 1, 1); |
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gainNode = audioContext.createGain(); |
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gainNode.gain.setValueAtTime(0, audioContext.currentTime); |
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navigator.mediaDevices.getUserMedia({ audio: true, video: false }) |
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.then(function(stream) { |
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microphone = audioContext.createMediaStreamSource(stream); |
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microphone.connect(analyser); |
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analyser.connect(scriptProcessor); |
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scriptProcessor.connect(gainNode); |
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gainNode.connect(audioContext.destination); |
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canvas = document.createElement('canvas'); |
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canvas.width = 800; |
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canvas.height = 300; |
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document.body.appendChild(canvas); |
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canvasCtx = canvas.getContext('2d'); |
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elfCanvas = document.getElementById('elfCanvas'); |
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elfCtx = elfCanvas.getContext('2d'); |
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drawSpectrum(); |
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}) |
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.catch(function(err) { |
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console.error('Ошибка доступа к микрофону:', err); |
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}); |
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scriptProcessor.onaudioprocess = processAudio; |
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} |
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function drawSpectrum() { |
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requestAnimationFrame(drawSpectrum); |
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const bufferLength = analyser.frequencyBinCount; |
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const dataArray = new Uint8Array(bufferLength); |
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analyser.getByteFrequencyData(dataArray); |
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canvasCtx.fillStyle = 'rgb(0, 0, 0)'; |
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canvasCtx.fillRect(0, 0, canvas.width, canvas.height); |
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const barWidth = (canvas.width / bufferLength) * 2.5; |
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let x = 0; |
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for(let i = 0; i < bufferLength; i++) { |
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const barHeight = dataArray[i] / 2; |
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canvasCtx.fillStyle = `rgb(${barHeight + 100}, 50, 50)`; |
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canvasCtx.fillRect(x, canvas.height - barHeight, barWidth, barHeight); |
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x += barWidth + 1; |
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} |
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canvasCtx.strokeStyle = 'rgb(0, 255, 0)'; |
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canvasCtx.beginPath(); |
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for(let i = 0; i < demodulatedSignal.length; i++) { |
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const x = (i / demodulatedSignal.length) * canvas.width; |
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const y = (0.5 - demodulatedSignal[i] / 2) * canvas.height; |
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if(i === 0) { |
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canvasCtx.moveTo(x, y); |
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} else { |
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canvasCtx.lineTo(x, y); |
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} |
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} |
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canvasCtx.stroke(); |
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const centerX = (centerFrequency / 20000) * canvas.width; |
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canvasCtx.strokeStyle = 'rgb(255, 255, 0)'; |
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canvasCtx.beginPath(); |
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canvasCtx.moveTo(centerX, 0); |
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canvasCtx.lineTo(centerX, canvas.height); |
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canvasCtx.stroke(); |
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if (isELFMode) { |
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elfCtx.fillStyle = 'rgb(0, 0, 0)'; |
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elfCtx.fillRect(0, 0, elfCanvas.width, elfCanvas.height); |
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elfCtx.strokeStyle = 'rgb(0, 255, 0)'; |
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elfCtx.beginPath(); |
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for(let i = 0; i < elfBuffer.length; i++) { |
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const x = (i / elfBuffer.length) * elfCanvas.width; |
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const y = (0.5 - elfBuffer[i] / 2) * elfCanvas.height; |
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if(i === 0) { |
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elfCtx.moveTo(x, y); |
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} else { |
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elfCtx.lineTo(x, y); |
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} |
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} |
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elfCtx.stroke(); |
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} |
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} |
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function processAudio(audioProcessingEvent) { |
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const inputBuffer = audioProcessingEvent.inputBuffer; |
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const outputBuffer = audioProcessingEvent.outputBuffer; |
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const inputData = inputBuffer.getChannelData(0); |
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const outputData = outputBuffer.getChannelData(0); |
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demodulatedSignal = []; |
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for(let i = 0; i < inputData.length; i++) { |
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const phase = Math.atan2(inputData[i], prevPhase); |
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const instantFreq = (phase - prevPhase + Math.PI) % (2 * Math.PI) - Math.PI; |
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let demodulated; |
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if (isELFMode) { |
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demodulated = lowPassFilter(instantFreq); |
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} else { |
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demodulated = instantFreq * (centerFrequency / 1000); |
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} |
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demodulatedSignal.push(demodulated); |
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outputData[i] = demodulated; |
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prevPhase = inputData[i]; |
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} |
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if (isELFMode) { |
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elfBuffer = elfBuffer.concat(demodulatedSignal); |
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if (elfBuffer.length > 1000) { |
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elfBuffer = elfBuffer.slice(-1000); |
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} |
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} |
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} |
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function lowPassFilter(input) { |
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const alpha = 0.1; |
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this.filtered = (this.filtered || 0) * (1 - alpha) + input * alpha; |
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return this.filtered; |
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} |
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function toggleAudio() { |
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if (isAudioEnabled) { |
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gainNode.gain.setValueAtTime(0, audioContext.currentTime); |
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document.getElementById('toggleAudio').textContent = 'Включить звук'; |
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} else { |
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gainNode.gain.setValueAtTime(1, audioContext.currentTime); |
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document.getElementById('toggleAudio').textContent = 'Выключить звук'; |
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} |
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isAudioEnabled = !isAudioEnabled; |
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} |
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function toggleELF() { |
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isELFMode = !isELFMode; |
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if (isELFMode) { |
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document.getElementById('toggleELF').textContent = 'Выключить ELF режим'; |
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document.getElementById('frequencySlider').min = 3; |
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document.getElementById('frequencySlider').max = 30; |
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centerFrequency = 15; |
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document.getElementById('frequencySlider').value = centerFrequency; |
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updateFrequency(); |
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} else { |
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document.getElementById('toggleELF').textContent = 'Включить ELF режим'; |
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document.getElementById('frequencySlider').min = 3; |
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document.getElementById('frequencySlider').max = 20000; |
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centerFrequency = 1000; |
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document.getElementById('frequencySlider').value = centerFrequency; |
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updateFrequency(); |
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} |
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elfBuffer = []; |
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} |
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function updateFrequency() { |
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centerFrequency = parseFloat(document.getElementById('frequencySlider').value); |
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document.getElementById('frequencyValue').textContent = centerFrequency.toFixed(0); |
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} |
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window.onload = function() { |
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startAudioAnalysis(); |
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document.getElementById('toggleAudio').addEventListener('click', toggleAudio); |
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document.getElementById('toggleELF').addEventListener('click', toggleELF); |
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document.getElementById('frequencySlider').addEventListener('input', updateFrequency); |
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}; |
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</script> |
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</body> |
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</html> |
