0012B - Audio Phase Reversal
v2.0
published
0012B
v2.0
AUDIO PHASE ERROR
2-Channel Phase Relationship
Applies to L - R, SL - SR
Duration, Threshold
Out of Phase Channel Pair(s)
https://qc.ebu.io/items/0012B/versions/2-0-0/
Check
Report
Summary
- EBU QC Id
- 0012B
- Name
- Audio Phase Reversal
- Status
- published
- Category
- subjective
- Lead editor
- Eric Carson
- Aliases
- phase stereo pair phase detection channel pair out of phase
- Tags
- audio
Versions
| Version | Status | Edition date | Saved by | Note |
|---|
Details
- Definition
- System shall determine if an audio channel pair which should normally be in phase is out of phase.
Channel pairs which should normally be in phase include the L/R pair, the SL/SR pair and the Lf/Rf (Lt/Rt) pair. - References
-
- Examples
-
-
00:01:02:00 - 00:01:13:23 audio channels 3 & 4 are out-of-phase with each other.
-
Input parameters
| Name | Description |
|---|
Output parameters
| Name | Description |
|---|
Test material
| Title | Version | Download |
|---|
Remarks
- Remarks
-
Determination of the channels' phase relationship could be done in the frequency domain on a sample-by-sample basis, looking specifically for a series of samples which are exactly 180 degrees out of alignment with each other (one channel at 0 degrees and its partner channel at 180 degrees, as an example)
Determination of the channels' phase relationship could be done in the time domain, by inspection of the waveform, phase reversal being revealed by series of samples where rises in the signal in one channel are accompanied simultaneously by falls in the other, and vice versa. Alternatively, an analysis in the frequency domain would show a consistent phase difference between the channels of 180 degrees if the channels being compared are phase reversed.
User discussions
| Title | Author | Last update |
|---|