<![CDATA[dynamic time warping (dtw) ?]]>Hi, in order to compare sounds with each other, I need dynamic time warping. I know that this is possible with PD since at least 10 years, but I don't know which externals I have to use for that. Any suggestions?

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtwRSS for NodeSat, 08 Aug 2026 12:55:33 GMTSun, 13 Apr 2025 20:27:20 GMT60<![CDATA[Reply to dynamic time warping (dtw) ? on Sun, 13 Apr 2025 20:27:20 GMT]]>Hi, in order to compare sounds with each other, I need dynamic time warping. I know that this is possible with PD since at least 10 years, but I don't know which externals I have to use for that. Any suggestions?

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtwhttp://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtwSun, 13 Apr 2025 20:27:20 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Mon, 21 Apr 2025 14:16:57 GMT]]>Do you need to warp the tempo of a metro? Or the playback of an audio file? Or something else?

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/2http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/2Mon, 21 Apr 2025 14:16:57 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Mon, 21 Apr 2025 19:16:17 GMT]]>@nicnut in my case dynamic time warping is used to measure the tonal similarity of audio files with slightly different length.

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/3http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/3Mon, 21 Apr 2025 19:16:17 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Mon, 21 Apr 2025 20:24:20 GMT]]>OK, So, for example, would you take two different audio files and play them both for 1000 milliseconds and, with your ears, compare where they are different or similar?

Is this what you imagined? If so that is doable.

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/4http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/4Mon, 21 Apr 2025 20:24:20 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Tue, 22 Apr 2025 04:23:03 GMT]]>@nicnut No, I need to calculate warping paths between two audio files to measure the tonal distance between them. Not by ear. Please google "dynamic time warping".

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/5http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/5Tue, 22 Apr 2025 04:23:03 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Tue, 22 Apr 2025 09:56:22 GMT]]>@elden said:

Please google "dynamic time warping".

Never tried this: https://github.com/irllabs/ml-lib
https://cycling74.com/forums/machine-learning-in-max-hallelujah

https://discourse.flucoma.org/search?q=dtw

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/6http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/6Tue, 22 Apr 2025 09:56:22 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Tue, 22 Apr 2025 11:49:14 GMT]]>@lacuna I'm afraid I won't find anything there that's useful in my scenario...

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/7http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/7Tue, 22 Apr 2025 11:49:14 GMT<![CDATA[Reply to dynamic time warping (dtw) ? on Tue, 22 Apr 2025 12:38:46 GMT]]>@elden You will have seen....... https://www.uni-weimar.de/kunst-und-gestaltung/wiki/images/Dynamic_Time_Warping_for_Pure_Data.pdf

The paper concludes with an application for body gesture recognition, but it is working with arrays so should be equally applicable to audio.
The code still exists as C++ to be compiled for a Pd external, but of course we have since moved to 64bit.
https://github.com/lemire/lbimproved

And there is this....... which is older, by the same same author....
https://github.com/felixr/dtw_lbimproved

David.

]]>http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/8http://forum.pdpatchrepo.info/topic/15089/dynamic-time-warping-dtw/8Tue, 22 Apr 2025 12:38:46 GMT