Encoded digital video transmission system
First Claim
Patent Images
1. A video transmission system comprising a transmitter and a packet switched network, the transmitter comprising a video source for providing an encoded video signal, and transmitting means for transmitting said encoded video signal over the packet switched network, characterized in that the transmitter further comprises:
- indication means for providing an indication of scene change,requirement means for indicating a required grade of service for a scene following said scene change, andrequest means for requesting a service from the packet switched network according to said required grade of service in response to said indication of scene change, prior to transmission of said scene following said scene change.
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Accused Products
Abstract
Compressed digitally encoded video signals are transmitted over an asynchronous transfer mode network with varying grades of service dependent on bitrate requirements for a desired picture quality and the currently available network capacity. To maximize transmission quality and minimize cost, the grade of service requested from the network is changeable in response to scene changes.
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Citations
15 Claims
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1. A video transmission system comprising a transmitter and a packet switched network, the transmitter comprising a video source for providing an encoded video signal, and transmitting means for transmitting said encoded video signal over the packet switched network, characterized in that the transmitter further comprises:
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indication means for providing an indication of scene change, requirement means for indicating a required grade of service for a scene following said scene change, and request means for requesting a service from the packet switched network according to said required grade of service in response to said indication of scene change, prior to transmission of said scene following said scene change. - View Dependent Claims (2, 3, 4)
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5. A transmitter for a video transmission system, in which system encoded video signals are carried over a packet switched network,
said transmitter comprising a video source for providing an encoded video signal, and transmitting means for transmitting said encoded video signal to the packet switched network, characterized in that the transmitter further comprises: -
indication means for providing an indication of scene change, requirement means for indicating a required grade of service for a scene following said scene change, and request means for requesting a service from the packet switched network according to said required grade of service in response to said indication of scene change, prior to transmission of said scene following said scene change. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A video transmission method comprising encoding an uncoded video signal, and transmitting said encoded video signal via a packet switched network to a receiver, characterized in that the method further comprises:
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providing an indication of scene change, indicating a required grade of service for a scene following said scene change, and requesting a service from the packet switched network according to said required grade of service in response to said indication of scene change, prior to transmission of said scene following said scene change. - View Dependent Claims (13, 14, 15)
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Specification