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46 lines
1.6 KiB
JavaScript
46 lines
1.6 KiB
JavaScript
const analyzeSignal = async (yamlString) => {
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const [yaml, mathMod, ndarrayMod, fftMod, domMod] = await Promise.all([
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import('https://esm.sh/js-yaml@4.1.0'),
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import('https://esm.sh/mathjs@11.11.0'),
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import('https://esm.sh/ndarray'),
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import('https://esm.sh/ndarray-fft'),
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import('https://esm.sh/dompurify@3.0.3')
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]);
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const math = mathMod.default;
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const ndarray = ndarrayMod.default;
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const fft = fftMod.default;
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const DOMPurify = domMod.default(window);
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const { sampleRate, duration, components } = yaml.load(yamlString);
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const N = sampleRate * duration;
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const half = N / 2;
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const signal = new Array(N);
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for (let i = 0; i < N; i++) {
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const t = i / sampleRate;
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let s = 0;
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for (const { frequency, amplitude } of components) {
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s += amplitude * math.sin(2 * math.pi * frequency * t);
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}
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signal[i] = s;
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}
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const real = ndarray(new Float64Array(signal));
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const imag = ndarray(new Float64Array(N));
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fft(1, real, imag);
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const magnitude = [];
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for (let k = 0; k <= half; k++) {
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magnitude[k] = math.sqrt(real.get(k) ** 2 + imag.get(k) ** 2) / half;
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}
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const peaks = magnitude
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.map((m, k) => ({
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frequencyHz: Math.round(k * sampleRate / N),
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magnitude: Math.round(m * 100) / 100
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}))
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.filter(p => p.magnitude > 0.1)
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.sort((a, b) => b.magnitude - a.magnitude);
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const html = `<table><tr><th>Frequency (Hz)</th><th>Magnitude</th></tr>${peaks
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.map(p => `<tr><td>${p.frequencyHz}</td><td>${p.magnitude}</td></tr>`)
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.join('')}</table>`;
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return { peaks, html: DOMPurify.sanitize(html), signalLength: N };
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};
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export default analyzeSignal;
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// Generation time: 83.104s
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// Result: FAIL
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