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Topic: Ascale - fast tempo adjusting filter (Read 1447 times) previous topic - next topic
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Ascale - fast tempo adjusting filter

Hi,

Implemented this because was not happy with current solutions.
Either time stretching in other open source projects was good quality and too slow or fast and bad quality or both slow and bad quality.

TODO items:
 - fix >1 channel processing, when channels go out of phase it can lose sync between L/R from time to time for example.
 - the ultra low frequencies, bellow 35 Hz, can cause issues for < 1.0 tempo, looking for possible solutions.
 - add support for tempo < 0.5 and > 2.0

If anybody interested I can post also some explanation of "novel" algorithm that I developed.
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Re: Ascale - fast tempo adjusting filter

Reply #1 –
Ones with enough skills can compile and try librempeg build on github, it have ascale filter in it.

I can post short mono channel audio wav files scaled to different tempo values together with reference audio if anybody really interested.
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Re: Ascale - fast tempo adjusting filter

Reply #2 –
Bug with the ultra low frequencies, bellow 35 Hz that caused issues for < 1.0 tempo have been fixed.
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Re: Ascale - fast tempo adjusting filter

Reply #3 –
The >1 channel processing sync-issue have been resolved.
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Re: Ascale - fast tempo adjusting filter

Reply #4 –
While I don't prefer to use speed changers that modify the waveform, I would like to try it or listen to some example files.

Re: Ascale - fast tempo adjusting filter

Reply #5 –
This one is very "lossless", it operates so it does not modify existing samples at all, it only inserts new periods of samples for slow tempo mode.
For the fast tempo mode, if will modify samples only if it needs to compress the some period of them, so for >=2.0 tempo it will modify all samples in such case.

Will post example files, what scales you are interested? only 0.5-2.0 range is supported for now.
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Re: Ascale - fast tempo adjusting filter

Reply #6 –
Quote from: mycroft on
This one is very "lossless", it operates so it does not modify existing samples at all, it only inserts new periods of samples for slow tempo mode.
For the fast tempo mode, if will modify samples only if it needs to compress the some period of them, so for >=2.0 tempo it will modify all samples in such case.

Will post example files, what scales you are interested? only 0.5-2.0 range is supported for now.

I can be happy to listen to 0.5x, 0.75x, 1x, 1.5, and 2x.