Proposal DC Management

Proposed Feature
The proposal is an option (defaulted to on) to apply a low frequency high-pass filter to all audio in Audacity so that DC offset is removed.

Developer Backing

 * None so far.

Use Cases

 * For most users of Audacity for audio processing:
 * DC offset is not audible (so may not be corrected by the user) but reduces headroom for subsequent processing
 * Differences in DC offset cause unwanted clicks where audio is tacked together
 * It is suggested that where a waveform is inherently asymmetrical, such as in recordings of brass instruments, Audacity's DC removal method (making the average positive and negative sample values equal) may create an offset.

Background
See DC offset and Talk:DC offset.

Previous Feature Requests relating to this proposal
Correct as at October 2012.

Better management of DC offset:


 * Automatic removal of DC offset after recording (rather than just as an option in Normalize) (7 votes)
 * Audacity should block DC at source because of the problems it causes. DC is not sound, and passing DC should only be a fringe purpose for scientists/researchers. (2 votes)