Information transmission during first-equalizing pulse interval

Details Information transmission during first-equalizing pulse interval Information transmission during first-equalizing pulse interval

1980-11-14

1982-06-15

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 708

Patent

active

043354025

ABSTRACT:
A teletext system transmits auxiliary information before the vertical sync pulse in the vertical blanking interval to avoid interference to the normal transmitted picture. At the transmitter a time gap is placed in the auxiliary information to allow for the equalizing pulses, while at the receiver the gap is removed. One, two, or all three lines that occur before the vertical sync pulse in the vertical blanking interval can be used to transmit the auxiliary teletext information signals.

REFERENCES:
patent: 2874213 (1959-02-01), Beers

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