| 摘要 |
<p>A method for rapid and smooth channel switching, which is used in digital TV system for channel switching is provided. In the case of channel switching, at first, the decoder is adjusted into a fast forward state, and decodes the video for display, then the decoder is recovered into a normal playing state and begins to decode the audio and video simultaneously. In order to ensure the non-loss of the audio and video, the system clock is adjusted to guarantee the non-loss of the audio, at the same time, the video clock acceptance-limit parameter N of the decoder is adjusted to guarantee the non-loss of the video. The value N is reduced gradually to approach the value N in the state of synchronization of video and audio. Then the synchronization of the audio and video is realized and the next channel is began to display. With the method of present invention, the channel switching time can be shortened within one second in the same network condition without changing the configuration of the encoder. The speed of channel switching of present invention can reach or exceed that in traditional cable TV. And it is solely necessary to adjust the system software and needn't to adjust the hardware, thus, the improvement of the switching speed can be realized with the minimum cost.</p> |
