Apparatus for converting the scanning period of a video signal t

Details Apparatus for converting the scanning period of a video signal t Apparatus for converting the scanning period of a video signal t

1993-04-09

1994-05-03

Powell, Mark R.

Television

Format conversion

H04N 701

Patent

active

053092333

ABSTRACT:
A general scanning-period converting device is equipped with two frame memories (first and second frames), and a video signal is written in any one of the frame memories (e.g., first memory) at a scanning period thereof while the video signal is repetitively read out from the other frame memory (e.g., second memory) in accordance with a synchronizing signal having a desired (target) shorter scanning period. When the write-in operation of the first frame memory is finished, the first frame memory is switched so as to carry out a read-out operation from an address thereof corresponding to a read-out address of the second frame memory at the finishing time of the write-in operation thereof, and the second frame memory which has carried out the read-out operation is switched so as to carry out the write-in operation.

REFERENCES:
patent: 3941921 (1976-03-01), Yumde et al.
patent: 4292652 (1981-09-01), Yumde et al.
patent: 4573080 (1986-02-01), Maze
patent: 4680632 (1987-07-01), Willis et al.
patent: 4901148 (1990-02-01), Nakayama et al.
patent: 4935815 (1990-06-01), Ichikawa et al.

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