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    • 8. 发明公开
    • METHOD FOR REDUCING CHANNEL CHANGE TIMES AND SYNCHRONIZING AUDIO/VIDEO CONTENT DURING CHANNEL CHANGE
    • 一种用于减少频道切换时间和同步音频/视频内容期间CHANNEL CHANGE
    • EP2082571A2
    • 2009-07-29
    • EP06845371.1
    • 2006-12-13
    • Thomson Licensing
    • DAI, JiwangSTEIN, Alan Jay
    • H04N5/44
    • H04N5/50H04N5/04H04N5/4401H04N21/23439H04N21/4307H04N21/4384H04N21/44016H04N21/6405
    • A digital A/V apparatus (50) provides reduced channel changes times and maintains synchronization between audio and video content during a channel change event. According to an exemplary embodiment, the digital A/V apparatus (50) includes at least one signal receiver (52, 62) for receiving a first audio stream, a first video stream and a second video stream, wherein the first and second video streams represent the same program and the first video stream has at least one characteristic different from the second video stream; a first audio signal processor (68) for processing the first audio stream to generate a first processed audio stream; a first video signal processor (66) for processing the first video stream to generate a first processed video stream; a second video signal processor (56, 58) for processing the second video stream to generate a second processed video stream having a delay with respect to the first processed video stream; a first buffer (74) for buffering the first processed audio stream to provide de-jittering; a renderer (78, 80) for rendering the first processed audio stream and the second processed video stream in response to a channel change command; a switch (76) for switching from the second processed video stream to the first processed video stream after the renderer (78) begins rendering the second processed video stream, and thereby causing the renderer (78) to begin rendering the first processed video stream; and whereby synchronization between the first processed audio stream and the first processed video stream is maintained during a channel change event.