Circuit for generating a digital, deleted data, blinking cross s

Details Circuit for generating a digital, deleted data, blinking cross s Circuit for generating a digital, deleted data, blinking cross s

1977-02-04

1978-12-19

Martin, John C.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 14, 360 72, 340324AD, H04N 578, G06F 314

Patent

active

041308425

ABSTRACT:
A circuit for generating a deleted data signal, which is reproduced as a blinking cross in a television picture, to provide thereby visual indication that a storage location in a video frame store is unoccupied, and available for recording therein. The blinking effect is created by interlacing one diagonal line generated in one field with an opposing diagonal line generated in a second field at the 30 Hertz frame rate. The deleted data signal corresponding to the blinking cross is recorded in the deleted track, e.g., the still location thereof, whereby the store can be interrogated and the deleted data signal suitably displayed to indicate the availability and location of the track for subsequent recording.

REFERENCES:
patent: 2937368 (1960-05-01), Newby
patent: 3797037 (1974-03-01), Kolpek

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