vertical interval reference

vertical interval reference

[′vərd·ə·kəl ¦in·tər·vəl ′ref·rəns]
(electronics)
A reference signal inserted into a television program signal every ¹⁄₆₀ second, in line 19 of the vertical blanking period between television frames, to provide references for luminance amplitude, black-level amplitude, sync amplitude, chrominance amplitude, and color-burst amplitude and phase. Abbreviated VIR.
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