Talk:DC offset

Limitations of offset removal
Audacity's DC offset removal method could potentially create a new offset and therefore a click in some rare cases. Two cases are noteworthy:


 * where only part of the audio is offset, for example if absolute silence with no offset has been inserted into an offset recording.
 * where the offset is not constant. Strictly speaking this is not DC offset, it is sub-sonic modulation or "slowly changing DC bias", but over a short time period it looks very much like DC offset.

In the case where some sections of the audio are clearly offset and some not, the solution in Audacity is to first carefully select each section of non-offset audio then use ] to split it a new track. Then remove the offset from the remaining audio, and paste the non-offset audio back. Use before split and paste if the non-offset audio is not absolute silence.

High Pass DC removal as in LADSPA dcRemove may well remove offset without adding new clicks if the offset is not constant.