Title: High-resolution information storage and retrieval system including electronic refresh buffer

Abstract: A high-resolution video filling system making use of a standard low-resolution magnetic tape video recorder for the storage and retrieval of documentary information. In the storage mode, each document to be filed is scanned by a high-resolution video camera to produce a video signal representing a single image frame having a predetermined number of scan lines that is a multiple of the number of scan lines in a standard low-resolution image frame. The image frame signal from the video camera is divided into a series of fields each having a like number of scan lines, the fields being sequentially applied to the recorder to produce on the moving tape thereof a set of parallel transverse tracks one for each field, the set representing a single image frame. In the retrieval mode, the set of tracks representing a selected document is played back by the recorder and written into an electronic refresh buffer whose contents are then repeatedly read out into a high-resolution monitor at a rate producing a flicker-free image of the selected document.

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Inventors: Holt, Arthur W. (Annapolis, MD, US)

Application Number: 871084
Filing Date: 1978-01-19
Publication_date: 1979-02-13
Assignee: Videofax Communications Corporation (Washington, DC)
Primary Class(es): 386/119 360/72.2
Other Classes:
US Patent Ref:

3095473	Jun, 1963	Roizen	360/10.
3514537	Mar, 1970	Uemura	360/72.
3573356	Apr, 1971	Toce	360/9.
3594729	Jul, 1971	Uemura	360/72.
3715481	Feb, 1973	Harr	360/35.
3761711	Sep, 1973	Nakamura	360/35.
3803352	Apr, 1974	Goldberger	360/9.
3934268	Jan, 1976	Uemura	360/72.

Other Refs:
Primary Examiner: Wolff, John H.
Assistant Examiner:
Attorney: Ebert; Michael