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AV Synchronization


As the display and audio technologies move to ever more complex and higher resolution systems (4K, UHD, HDR, Dolby ATMOS etc.), the processing requirements will cause AV sync issues.

Each component or firmware update will alter the AV sync in a system, and everyone knows how annoying it is when the LipSync is out, Sync-One2 is the most accurate way to check a system is in sync.

Lipsync Delay Measurement Made Easy

Sync-One2 measures audio visual (or lip-sync) delays / errors to help you make the correct adjustments to ensure everything remains in sync, without resorting to guessing.

Trying to check any system manually is always prone to error, as it relies on the subjective view of the person doing the testing.

Sync-One2 takes away the guessing by accurately measuring the time span between an audio beep and video flash (e.g. a 2-pop / flash frame or similar), giving the length of the delay and if the audio leads or lags with reference to the video.

With this reading you can simply set the audio delay in an AV amp or audio delay unit or adjust your digital workflow package. No guessing, no time wasted, Sync-One2 makes it easy.

Having a system in good sync helps to mitigate potential content sync errors, streaming or satellite content providers are known to suffer from poor sync. The overall system will be able to tolerate a larger error in the content if the base system is known to be in sync to start with.

Sync-One2 displays the error in milliseconds (1/1000th of a second), and in frames too if you want, all in real time so it becomes easy to make suitable adjustments.

Statistics are also calculated on the most recent 60 readings taken to help check overall system stability or drift.

Learn more…

Sync One2 Web

Test Video

To make measurements of sync delay in your system just play back the downloadable test file from the Sync One2 site or use this YouTube video. Point the Sync One2 mic and light sensors at the screen and Sync One2 calculates the delay between the flash and the beep….

Sync-One2 has the following core features to help make the task easier, quicker, and more accurate;
  • Easy one handed operation, systems can be checked in a couple of minutes
  • Works with any resolution or type of display, so is 4K / UHD / HDR ready, fine with LCD, OLED, Plasma, Projectors etc.
  • Measurement of audio visual delay up to ±750 milliseconds (or 2/3 of a second)
  • Self calibrating to help reduce false readings from ambient light and noise
  • Output in milliseconds and also, if required, in frames to an accuracy of 1/100th of frame for any rate input between 1 and 99 (readings over 10 frames are displayed to 1/10th of a frame)
  • Real time output in milliseconds / frames, a rolling real time average can also be displayed in milliseconds or frames
  • Easy to read 16×2 OLED display with a wide viewing angle
  • Large number display option for easy reading when taking measurements
  • Buffer of the most recent 60 readings, with statistical analysis including average and span in milliseconds and also in frames if required. Individual readings can also be removed from the buffer as required
  • User adjustable offset can be applied to readings, up to ±99 milliseconds and if a frame rate is selected also in frames
  • Adjustable sensitivity levels for audio and video, default is the most sensitive setting with four lower settings available for each
  • Detection test for setup assistance when testing, shows when audio and/or video input is triggered
  • Speaker distance input for correction of readings in large spaces, such as lecture theatres, up to 20m (65’ 7”)
  • Easy to use menus to set the various options and functions
  • Settings and options stored in flash memory so retained even if the batteries are removed, memory buffer is cleared at shutdown
  • Runs on common AA (LR6) batteries, including rechargeables
  • Low battery indication, with automatic shutdown if they get too low
  • Adjustable inactivity shutdown from to 1 to 60 minutes, which can also be disabled if required
  • Measurement of audio visual delay up to ±750 milliseconds
  • Display is rounded to the nearest 1 millisecond or 1/100th of a frame, internal timing resolution of 0.05 milliseconds between light and sound pulse
  • Self calibration adjusts for ambient noise and light, including fluorescent/ LED light flicker
  • Automatic microphone gain adjustment during calibration process
  • Dimensions (H x W x D), 144mm x 90mm x 30mm (5.6″ x 3.5″ x 1.2”)
  • 165g (5.8oz) excluding batteries
  • 16×2 OLED display for easy viewing, fast response, and low power consumption
  • Operating temperature from 5 to 50 Celsius (41 to 122 Fahrenheit)
  • 2 x AA (LR6) batteries, rechargeable AA batteries are fine too
  • Reverse battery protection
  • Battery life from standard AA batteries is around 50 hours of continuous operation
  • A tiny current of less than 0.1 micro amps is used when off. Even so when not being used for a while it is always best to remove the batteries
  • Low battery indication and auto shutdown when batteries become too low to maintain accuracy