Insertion of non-synchronous data into vertical interval

Details Insertion of non-synchronous data into vertical interval Insertion of non-synchronous data into vertical interval

1981-08-13

1983-02-15

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 704

Patent

active

043743994

ABSTRACT:
A head-end facility is provided for encoding selected data into the vertical intervals of one or more received television signals in a manner so as to avoid conflicts with the simultaneous re-broadcasting of the encoded signals. The selected data is generated at the head-end facility in the form of a plurality of pairs of duplicate data packets whose corresponding portions are separated in time by one-half field of a standard television signal. A plurality of channel registers are successively updated by being loaded with one of the duplicate data packets of each pair, the loaded duplicate data packets being non-coincident in time with the vertical intervals of the received television signal intended to be re-broadcast over the respective channel. The contents of the channel registers are successively read and inserted into the vertical intervals of the television signals of the respective channels.

REFERENCES:
patent: 3996583 (1976-12-01), Hutt et al.

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