1.   In the United States, part of the blanking interval was set aside to carry program identification information, schedules and emergency broadcast functions.

2.   The approaches went beyond closed-captioning and were based on a broadcasting feature called the vertical blanking interval.

3.   The chips are hard-wired to recognize signals in specific places in the blanking interval.

4.   Updated schedules are downloaded weekly from information that is broadcast by another company in an unused portion of television signals called the vertical blanking interval.

5.   The text data is transmitted over an unused portion of the TV picture signal called the vertical blanking interval.