/tags/dtw/ Recent content in DTW on Bdim Hugo -- 0.164.0 en 2021-CURRENT_YEAR Bdim Tue, 23 Dec 2025 00:00:11 +0800 /posts/learning-notes-on-dtw-dynamic-time-warping/ Tue, 23 Dec 2025 00:00:11 +0800 /posts/learning-notes-on-dtw-dynamic-time-warping/ <h1 id="starting-with-an-intuitive-problem">Starting with an Intuitive Problem</h1> <p>When processing audio, speech, or other time series data, we will almost certainly encounter this problem: if two signal segments are similar in &ldquo;content,&rdquo; but not consistent in the speed of time progression, can we still judge that they are similar?</p> <p>This problem is very common in real scenarios. For example, two people sing the same melody, but one sings faster and the other slower; students may slow down due to hesitation during sight-singing, retreat and re-sing after making mistakes, or suddenly accelerate at certain positions; the same sentence is spoken by different people with different speaking speeds and different pause patterns. In these cases, if we rigidly require &ldquo;frame 1 matches frame 1, frame 2 matches frame 2,&rdquo; then almost all real samples will be simply and crudely judged as &ldquo;not similar.&rdquo;</p>