As I understand and as Matt already wrote, you wanted a transposition of the phasor~'s frequency (which would change the frequency of the loop but not the sample content), but instead you did the classic up/downsampling-of-the-soundsample transposition. (The "distortion" you get is due to the difference in spectral content, which should be richer as you transpose upwards since you read a longer portion of the sample. Also, the end of the loop changes which could mean a harder discontinuity.)
I tried to fix the transposition and I also added an offset in the audio path before tabread4~ that corresponds to the beginning of the loop. And I'm sure you've already figured everything out, long before you got our emails. alabala On 23 April 2010 20:27, Frank Barknecht <f...@footils.org> wrote: > Hi, > > not related to the thread on smoother audio in Pd, I am struggling with > doing a smooth > loop player for data stored in tables. > > One building block for this is attached: It is a simple tabread4~ lookup > that > should loop over a configurable section of a table and play it back with > various frequencies. > As you'll easily see, I use a > > [phasor~] > | > [*~ loopsize] > | > [+~ loopstart] > | > [tabread4~ table] > > idiom here. Now I would like to avoid enveloping the rewind sections, so I > built an elaborate mechanism to set the loop points as good as possible by > hand. Test sections let you load a sample or try to find the smooth loop > points > inside of a sine-wave table graphically. > > Now my problem is, that even when I have found a nice and smooth sounding > loop > section, as soon as I start to change the frequency played (with the "pd > transpose" things), the sound gets very distorted. > > I'm puzzled: Shouldn't the tabread4~ interpolate correctly in this case? > Any > help or explanation is appreciated. (Except anything involving crossfades: > I > know I could do that and I guess I also know how.) > > Ciao > -- > Frank Barknecht Do You RjDj.me? _ ______footils.org__ > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > -- ypatios
looppoints2.pd
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