Brooktree Corporation

Conexant Systems, Inc.

Stephen G Glennon

Paul B Wood

Michael J Brunolli

Michael D Asal

David Cureton Baker

Daniel Patrick Mulligan

Jeffrey L Nye

Jonathan I Siann

Benjamin E Felts, Iii

Matthew Damian Bates

David A G Wilson

A number of methods to display interlaced video on non-interlaced monitor are disclosed. One method is to display all of the incoming fields but one at a time, and correcting for the positional offset of one field relative to another in the interlaced data. An important aspect of the present invention is the correction of the positional offset of the two interlaced video fields. There are two ways presented to deal with the vertical offset of the two fields in accordance with the present invention. The first way is that the two fields can be displayed at different positions on the display using a non-interlaced display. The second way is that the video data can be altered to correct the positional offset between the fields. Another method of the present invention is to lock the frame rate of the output video to the incoming field rate or a multiple of the incoming field rate, or to certain sub-multiples of the incoming field rate. An important feature of this method is that each frame of the output monitor need not match the incoming field time precisely. As long as each output frame is displayed exactly the predetermined number of times, the appearance of smooth motion will be maintained.

Methods and systems for displaying interlaced video on non-interlaced monitors

Multimedia information (e.g. graphics, video, sound, control information) passes through a system bus from a CPU main memory to a display memory in accordance with CPU commands. The information may be packetized with associated packet types identifying the different media. A media stream controller processes the information and passes the processed information to the display memory. Controllers in the media stream controller individually pass multimedia information to the display memory. A PACDAC controller in the media stream controller causes media (e.g. graphics, video) in the display memory to be transferred to a PACDAC for display. The format, sequence, and rate of this transfer may be flexibly controlled by software on a frame by frame basis. Arbitration logic establishes priorities for the different controllers in the media stream controller so they may share a single bus for accessing the display memory. A single interrupt controller coordinates interrupts (e.g. at a single level) to provide priorities based upon the type of interrupt cause or media. Each interrupt cause activates only the appropriate callback functions. Two different virtual machine sessions (e.g. Windows, DOS) share an interrupt line to process interrupt requests form one (1) session (e.g. Windows) before processing interrupt requests from the other.

Using prioritized interrupt callback routines to process different types

Aspects of the present invention provide a system for selectively processing a video signal in accordance with instructions from application software. The system contains a video decoder for converting an analog video signal to digital video data, and a controller for formatting and routing the digital video data. A list of control structures may be loaded into a memory associated with the controller. The control structures contain formatting and routing information used by the controller to process different portions of the video stream. The number and content of control structures as well as the correlation between the control structures and selected portions of the video stream may be flexibly determined by application software. In particular, the control structures may be configured such that certain portions of the video stream are routed to the CPU for processing, while other portions are routed to a display driver and output on a display device.

System and method for capturing and transferring selected portions of a

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Cedar Park, TX, United States of America

Stephen G Glennon