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Fast and smooth channel switching method for IPTV set top box

A smooth channel switching technology, applied in the field of IPTV, can solve the problem of slow switching speed

Inactive Publication Date: 2009-10-14
深圳优地科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide and improve the channel switching speed of the IPTV set-top box, and find an effective and low-cost method to solve the problem of slow switching speed

Method used

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  • Fast and smooth channel switching method for IPTV set top box
  • Fast and smooth channel switching method for IPTV set top box
  • Fast and smooth channel switching method for IPTV set top box

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Embodiment Construction

[0037] When IPTV TV is switching channels, because the clocks of the audio and video frames sent from the encoder to the set-top box are not synchronized, the difference is generally about 1.5 seconds. In order to perform lip synchronization during decoding, traditional decoders will buffer the audio or video with a clock ahead in the decoder, and play the audio and video at the same time when the synchronized video or audio arrives. The disadvantage of this method is: during the synchronization process, the user can only see the TV black frequency or video pause for a long time.

[0038] The so-called audio and video synchronization is not completely synchronized, but has a range. For example, if the current system clock is 1 minute and 50 seconds, then he thinks that the audio and video within the range of 1 minute 49 seconds and 1 minute 51 seconds are synchronized.

[0039] This is because the decoder has two important parameters, that is, the decoder has the limit of the...

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Abstract

The present invention proposes a method for quickly and smoothly switching channels, which is used to switch channels in a digital television system. When switching channels, first adjust the decoder to the fast-forward state, and decode the video to play, and then restore the decoder to the normal state , start decoding audio and video at the same time. In order to ensure that the audio and video are not lost, adjust the system clock to ensure that the audio is not lost, and at the same time adjust the video clock tolerance limit parameter N of the decoder to ensure that the video is not lost. And gradually reduce the N value, approaching the N value when the audio and video are synchronized, realize the audio and video synchronization, and start to play the next channel. Through the method of the present invention, the channel switching time can be shortened to less than one second without changing the encoder configuration and the same network conditions, reaching or exceeding the speed of traditional cable TV channel switching, and only need to adjust the system software without making hardware The adjustment on the above can complete the improvement of the switching speed with the minimum cost.

Description

technical field [0001] The invention relates to the field of IPTV, in particular to a method for an IPTV set-top box to switch channels. Background technique [0002] Nowadays, the IPTV (internet-based interactive TV) industry is developing rapidly, and the set-top box plays an important role as the terminal equipment of the Internet TV. Its working principle is: the server sends the streaming media data encoded by the encoder to the set-top box through the Internet, and the decoder residing on the set-top box completes the decoding of the data, and then outputs the video and audio signals to the TV, and the TV displays The image plays sound. [0003] The biggest difference between IPTV and traditional cable TV is: traditional cable TV can only passively receive data and cannot do on-demand, and the content broadcast on TV channels is real-time. IPTV can meet the needs of user interaction to the greatest extent. It can not only play VOD on demand, but also achieve time-shi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04N5/50H04N5/00
CPCH04N21/4384
Inventor 刘少军姚亚群
Owner 深圳优地科技有限公司
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