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: 2008-06-11
深圳优地科技有限公司
View PDF0 Cites 8 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for quickly and smoothly switching channels, which is used in a digital television system for switching the channels, wherein, during the process of switching the channels, a decoder is firstly adjusted to forward state and video play is decoded, and then the decoder returns to normal state and begins to simultaneously decode audios and videos. In order to guarantee that the audios and the videos are not lost, a system clock is adjusted and the audios are guaranteed to be not lost; simultaneously, a tolerance limit parameter N of a video clock of the decoder is adjusted and the videos are guaranteed to be not lost. Moreover, N value is reduced gradually and approaches N value when the audios and the videos are synchronized; synchronization of the audios and the videos is realized and a next channel is begun to play. By adoption of the method of the invention, time for switching the channels is shortened to be within one second under the condition that arrangement of a coder is unnecessary to change in the same network condition, and switching speed reaches or exceeds speed for switching channels of the prior cable television; moreover, improvement of the switching speed is realized through minimum cost only with the necessity for adjusting system softwares and without the necessity for adjusting hardwares.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(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