Hello Martin, Generally, SoX should do what it’s been told to do i.e. not try to guess what alternative would please the user when this is not possible.
For example, in this particular case, as well as a cut-off point, the lowpass sinc filter has a transition band width that is adjustable by the user, who may just as concerned in achieving the associated (perhaps gentle) roll-off as the ultimate cut-off. So the ‘correct’ behaviour in this case might be to increase the sample-rate, apply the sinc, and optionally return the sample-rate to the original. Scripting works well in such situations i.e. using soxi to query the audio file attributes and building up the sox command line as appropriate to the user’s preferences. That said, the current code does allow for effects that deem themselves redundant to simply remove themselves from the effects chain. E.g. see the rate effect: it will remove itself if its input rate and requested rate are equal. If the sinc effect were given the ability to auto-remove when the cutoff is above Nyquist, it would need to emit a WARN message or perhaps better, to auto-remove only if instructed to do so via a new flag. HTH, Rob _______________________________________________ SoX-devel mailing list SoX-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-devel
