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Phase Repair

Correct reversed channel polarity and remove DC offset.

Up to 200 MB. Decoded at 48 kHz on this device. Long recordings may exceed the browser memory limit.

Manual polarity correction is not time alignment, source separation or frequency-dependent phase reconstruction.

How phase repair works

What it does

Phase repair fixes two simple problems. The first is reversed polarity, where one channel is upside down compared with the other. Played in stereo it sounds wide and hollow, and summed to mono the centre can almost disappear. The tool flips the channel you choose so both point the same way.

The second is DC offset, a constant shift that moves the whole waveform above or below zero. The tool measures the average value of each channel over the whole file and subtracts it, which centres the waveform and gives back a little headroom.

Settings

  • Reverse polarity: neither channel, left (or the only channel of a mono file), or right.
  • Remove DC offset: on by default. Turn it off if you only want to flip polarity.

Files and output

  • Mono or stereo files up to 200 MB. Files with more than two channels are refused.
  • Audio is decoded at 48 kHz on your device, so about 11 minutes of mono or 5.5 minutes of stereo fit in the memory limit.
  • The result is a 24-bit WAV at 48 kHz with the same number of channels. If the processed audio would go over full scale, the whole file is turned down by a fixed amount, and that amount is shown.

Good to know

  • The tool does not detect which channel is reversed. Try left, then compare with the original, and check the result in mono.
  • It does not shift channels in time. A delay between two microphones is not corrected.
  • Phase problems that change with frequency are not fixed.

Listen to the original and corrected recording before exporting.

How it works.

  1. 1Choose a recordingOpen a mono or stereo audio file. Nothing is uploaded.
  2. 2Adjust and listenSet the controls, process, and compare with the original. Keep only changes that help your recording.
  3. 3Save a new WAVDownload a 24-bit WAV with your plan access. Your original file is unchanged.

Questions.

What are the limits?

Manual polarity correction is not time alignment, source separation or frequency-dependent phase reconstruction.

Does it master my song?

No. This is a focused repair step, not loudness mastering. Only output that would clip is attenuated, and that amount is shown.

How do I know if a channel is reversed?

Listen in mono. If the vocal, kick or bass gets much quieter or thin when the two channels are summed, one channel is likely reversed. Flip one channel and compare.

Does DC offset removal change the sound?

Usually not in a way you can hear. It removes a constant shift from zero, which can prevent a click at the start or end of playback and frees some headroom.

Explore more.