How did the TV know what closed captions to show when VHS tapes were played?
In: Technology
CC was stored in the Vertical blanking back in the analog days of TV. It’s In the crt scan lines that you can’t see unless with a broadcast monitor. Generally line 21. Active picture started on line 22 for NTSC SDTV.
Source: myself. This is my career, though no analog anymore, all digital.
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