Method of and apparatus for generating a precise frame rate in digital video transmission from a computer system to a digital video device
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United States of America Patent
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Mar 3, 2009
Grant Date -
Jul 7, 2005
app pub date -
Feb 28, 2005
filing date -
Feb 12, 1999
priority date (Note) -
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Abstract
A video frame is part of an isochronous stream of video data transmitted over an IEEE 1394-1995 network. The desired frame rate is determined by the receiving device. The source device determines a ratio of data packets versus video frames in response to the frame rate and a cycle time. This ratio rarely computes to an integer result. Accordingly, the source device generates two groups of frames. A first group contains an integer value of packets nearest to and above the ratio. A second group contains an integer value of packets nearest to and below the ratio. To achieve the frame rate, the source device serially generates each of the frames in an order including a combination of the first group of frames and the second group of frames to achieve the ratio. The source device then transmits the resulting isochronous video stream of data to the receiving device.
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