Applies to: TV/audio system with documented timing controls; use a known synchronised reference before changing any delay value.
The useful distinctions
- Sony distinguishes audio-before-video and audio-after-video cases.
- Sony describes picture delay as one possible sync action.
- External audio processing can contribute delay.
Give the offset a direction
“Out of sync” leaves the next person guessing which signal needs to move. Describe the event explicitly: the clap is heard before the hands meet, or after they meet. If the direction is difficult to judge, use a better known reference before altering controls. Avoid estimating precise milliseconds from ordinary viewing when the method cannot support that precision.
Understand the control’s action
A control labelled delay may move audio, picture or a model-specific combination. Read the exact manual before using it. Increasing an audio delay cannot solve a situation that requires the audio to arrive earlier relative to the same unchanged picture. That is a logical limit of the proposed comparison, not a claim about every manufacturer’s implementation.
Keep one timing owner at a time
Several devices in a chain may expose timing controls. Record their starting values and change one supported control during the test. Otherwise one adjustment can conceal another and create inconsistent results across inputs. A useful report states direction, route, reference and which single adjustment changed the outcome. Fixed-offset correction still needs a separate check for drift over a longer uninterrupted passage.
A focused way to proceed
- Use a known visible/audio event and record the initial control values.
- Write whether sound leads or follows the visible event.
- Compare TV-speaker and external routes if supported.
- Change only one model-documented timing control in the relevant direction.
- Restore it and verify that the observed change repeats.
Worked example · synthetic
Hypothetical example: sound follows a reference clap through the soundbar. A documented picture-delay comparison moves alignment toward the event, and restoration returns the original mismatch. The user records the control’s actual action rather than assuming every delay slider moves audio.
When to stop or ask for help
Use exact model documentation. Do not repeatedly add delay across devices or claim a universal correction value.