Frame-rate converting film scanner having continuously variable

Details Frame-rate converting film scanner having continuously variable Frame-rate converting film scanner having continuously variable

1979-08-20

1981-01-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 336

Patent

active

042452538

ABSTRACT:
Frame-rate converting film scanning apparatus capable of scanning film (having frame location indicia) projected at any speed, selected from within a range of speeds, to produce a television signal having a standard field rate is disclosed. The scanning apparatus is of the type employing a solid-state line sensor for scanning a projected image of the film in a direction generally perpendicular to the length of the film and a rotating multifacet mirror to displace the projected image relative to the line sensor for effecting a raster scan of a film frame to produce a standard television signal. The apparatus includes a frame position sensor responsive to a frame-rate converted image of the frame location indicia for producing a frame location signal. The speed of rotation of the mirror is controlled by a phase locked loop servo that employs a standard television vertical synchronization signal as a reference and receives the frame location signal as a feedback signal. The speed of rotation of the mirror is controlled by the phase locked loop such that the frame location signal and the vertical synchronization signal are in phase, thereby insuring proper frame-rate conversion regardless of the film projection speed.

REFERENCES:
patent: 2666356 (1954-01-01), Graham
patent: 2818467 (1957-12-01), Harris et al.
patent: 2890277 (1953-05-01), Duke
patent: 2922841 (1960-01-01), Graziano
patent: 3651254 (1972-03-01), Metzger
patent: 3790707 (1974-02-01), Valenta
patent: 3809807 (1974-05-01), Bulharowski
patent: 4148071 (1979-04-01), Zinchuk
Wright, "Solid State Sensors: The Use of a Single Dimension 512 Element Array for Film Scanning", BBC Research Report No. 1973/32.

Affiliated with

Also associated with

Rating

Frame-rate converting film scanner having continuously variable does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frame-rate converting film scanner having continuously variable , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frame-rate converting film scanner having continuously variable will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2234155