Synchronized multiple format video processing method and apparatus
AssigneeSarnoff Corporation
InventorGlenn A. Reitmeier
Life of this patent
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Abstract
A multiple format video signal processing system operating in conjunction with a display device timing system to produce synchronized video and timing signals suitable for use by a fixed horizontal scanning frequency display device.
Claims20
Apparatus for processing an input video signal having one of a plurality of display formats to produce an output video signal suitable for use by a display device, said display device utilizing a fixed frequency horizontal deflection signal and a vertical deflection signal, said apparatus comprising:
- a format converter, for selectively adapting at least a horizontal display format of said input video signal to a horizontal display format defined by aid fixed frequency horizontal deflection signal;
- a frame rate converter, coupled to said format converter, for selectively adapting a frame rate of said input video signal to a frame rate of said display device;
- a raster generator, for generating, in response to a raster clock signal, said fixed frequency horizontal deflection signal and said vertical deflection signal, said vertical deflection signal having a frequency defined by a vertical display format of said output video signal;
- and
- a clock circuit, responsive to a program clock reference (PCR) associated with said input video signal, for producing a system clock signal and said raster clock signal, said raster clock signal being generated by frequency scaling said system clock signal.
In a system for processing a video stream associated with at least one of a plurality of video display formats, a method for generating video and timing signals for use by a display device having a substantially fixed horizontal scanning frequency, said method comprising the steps of:
- identifying a video display format associated with said video stream;
- generating, in response to a program clock reference (PCR) associated with said video stream, a system clock signal and a raster clock signal, said raster clock signal being generated by frequency scaling said system clock signal;
- generating, in response to the raster clock signal, a substantially fixed frequency horizontal synchronizing signal and a vertical synchronizing signal, said substantially fixed frequency horizontal synchronizing signal and said vertical synchronizing signal defining an active viewing area of a display device, said vertical deflection signal having a frequency defined by a vertical display format of said video stream;
- and
- adapting at least a horizontal display format of said video stream in response to a horizontal display format defined by said fixed frequency horizontal deflection signal.
Dependencies are inferred from the claim text.