Time base converter which automatically adapts to varying video

Details Time base converter which automatically adapts to varying video Time base converter which automatically adapts to varying video

1993-04-15

1995-04-04

Groody, James J.

Television

Format conversion

Involving both line number and field rate conversion

348458, 348459, H04N 701

Patent

active

054041708

ABSTRACT:
A time base changer for a video converter for converting between a sequence of input video images at an input video rate and a sequence of output video images at an output video rate is operable to convert from one of a number of input video rates to an output video rate. The time base changer includes N video stores 32 where N is a integer greater than one, each for storing a video image. The video stores are enabled cyclically and at the appropriate input video rate for storing successive input video images in successive video stores. Multiplexers 36 connected to the video stores can output pairs of video images from the video stores at the output video rate. The time base changer includes a counter 38 which can be clocked at the appropriate one of the input video rates. The counter is preferably a modulo-N counter. Control signals for controlling the multiplexer in the selection of the adjacent pairs of video stores preferably includes a samplers 44 for sampling the output of the counter 38 at the output video rate.

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