echogarden/dist/alignment/DTWMfccSequenceAlignment.js

An easy-to-use speech toolset. Includes tools for synthesis, recognition, alignment, speech translation, language detection, source separation and more.

import { cosineDistancePrecomputedMagnitudes, euclideanDistance, euclideanDistance13Dim, magnitude } from '../math/VectorMath.js';
import { getIntegerRange, logToStderr } from '../utilities/Utilities.js';
import { alignDTWWindowed } from './DTWSequenceAlignmentWindowed.js';
const log = logToStderr;
export async function alignMFCC_DTW(mfccFrames1, mfccFrames2, windowLength, distanceFunctionKind = 'euclidean', centerIndexes) {
    if (distanceFunctionKind == 'euclidean') {
        let distanceFunction = euclideanDistance;
        if (mfccFrames1.length > 0 && mfccFrames1[0].length === 13) {
            distanceFunction = euclideanDistance13Dim;
        }
        const { path } = alignDTWWindowed(mfccFrames1, mfccFrames2, distanceFunction, windowLength, centerIndexes);
        return path;
    }
    else if (distanceFunctionKind == 'cosine') {
        const indexes1 = getIntegerRange(0, mfccFrames1.length);
        const indexes2 = getIntegerRange(0, mfccFrames2.length);
        const magnitudes1 = mfccFrames1.map(magnitude);
        const magnitudes2 = mfccFrames2.map(magnitude);
        const distanceFunction = (i, j) => cosineDistancePrecomputedMagnitudes(mfccFrames1[i], mfccFrames2[j], magnitudes1[i], magnitudes2[j]);
        const { path } = alignDTWWindowed(indexes1, indexes2, distanceFunction, windowLength, centerIndexes);
        return path;
    }
    else {
        throw new Error('Invalid distance function');
    }
}
export function getCostMatrixMemorySizeMB(sequence1Length, sequence2Length, windowLength) {
    const costMatrixMemorySizeMB = sequence1Length * Math.min(sequence2Length, windowLength) * 4 / 1000000;
    return costMatrixMemorySizeMB;
}
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