Hi Jonty, I don't know on what algorithm the audacity and rubberband time-stretch is based on (PSOLA, WSOLA, etc.... , time-domain or frequency domain or whatever) but for what I know about that issue is that I never heard of an algorithm that stretches a soundfile by putting silence in between the extracted chunks. What about phase hits? ... the resulting signal has to produce terrible click noises. For example.... A simple PSOLA time-stretch algorithm would basically split the audiofile *P*itch *S*yncronous into chunks of some ms, duplicate certain chunks and reassemble the file by *O*ver*L*ap and *A*dd. I stretched Rostropovich playing Bachs Cello Suite No 1 Prelude to -50% and -99%. Didn't sound brilliant (lots of artifacts) but there were no chunks of silence in between the samples --> i have to ask: what do you mean by "into the samples" ? A sample is only one little value. Having 44.1kHz sampling rate means you have 44100 discrete samples per second. There is nothing to put "into" a sample. Or do you mean the audio file you used as an example? Could you show us a spectrogram/waveform screenshot? > Existing tempo changers that I've > seen put some silence in the output file when I use them. I never saw such a thing. > Again, usual disclaimer: If I'm being stupid, let me know. Why is someone stupid because of not knowing everything about anything? Don't worry :) Best regards, Sebastian. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
