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Reference.org
Tri-level sync
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<p>Tri-level sync is an analogue video synchronization pulse primarily used for the locking of <a href="/facts/High-definition_video/3CoUBum1">high-definition video</a> signals (<a href="/facts/Genlock/8BkfWe67">genlock</a>). </p><p>It is preferred in HD environments over <a href="/facts/Black_and_burst/uyUoJdD6">black and burst</a>, as timing jitter is reduced due to the nature of its higher frequency. It also benefits from having no DC content, as the pulses are in both polarities. </p>