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Transport stream-based duplex digital television signal seamless switching method and system

A digital TV signal and seamless switching technology, applied in the field of signal switching, can solve problems such as seamless switching of digital TV signals at the difficult program layer, and achieve the effect of avoiding receiving delay errors

Active Publication Date: 2013-09-18
上海东方富联科技有限公司
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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and system for seamlessly switching two-way digital TV signals based on transport streams, which is used to solve the problem that it is difficult to implement digital TV signals at the program level in the prior art. The problem of seamless switching

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  • Transport stream-based duplex digital television signal seamless switching method and system
  • Transport stream-based duplex digital television signal seamless switching method and system
  • Transport stream-based duplex digital television signal seamless switching method and system

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Embodiment 1

[0051] This embodiment provides a method for seamlessly switching two-way digital television signals based on transport streams, such as figure 1 As shown, the method for seamless switching of dual-channel digital television signals based on transport streams includes:

[0052]The two channels of transport stream data obtained with the same encoding method and the same program content are respectively referred to as the first channel of transport stream data and the second channel of transport stream data. Further, the two channels of transport stream data with the same coding method and the same program content are two channels of signals from different channels, with different time delays, and transmitted after different modulations; that is, the first channel of transport stream data and the second channel of transmission stream data Streaming data is two signals that come from different channels, have different delays, are transmitted through different modulations, have th...

Embodiment 2

[0078] In this embodiment, the method for seamless switching of two-channel digital television signals based on transport streams according to the present invention is described in detail by taking switching between satellite signals and terrestrial signals as an example. Since the ground signal source is the result of remodulation after demodulation, demultiplexing and multiplexing of satellite signals, there is a time delay of more than 1s, and the experimental difference is not fixed. The satellite signal is sent to the receiving system through a special satellite mobile receiving antenna. The satellite demodulation module in the receiving system demodulates the satellite radio frequency signal into a TS stream and sends it to the buffer. Considering the volatility of the delay, the buffer area should be set as much as possible. Above 10s. Use the decoding chip to find out the basic frame according to the information of the corresponding TS stream, and send the demultiplexe...

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Abstract

The invention provides a transport stream-based duplex digital television signal seamless switching method and a transport stream-based duplex digital television signal seamless switching system. The method comprises the following steps: acquiring two transport streams of data with the same encoding mode and the same program content; respectively dismounting the two transport streams of data into a plurality of TS (transport stream) packets which take the predetermined number of bytes as a unit, wherein each TS packet comprises at least one PES (packet elementary stream) packet; reading DTS (decoding time stamp) frame information in each PES packet according to a PID (packet identifier) value of the encoding end mark of the PES packet, and taking the DTS frame information as a relative reference time stamp for code stream switching; aligning the two transport streams of data by taking the time stamp as the reference and caching the two transport streams of data; and respectively capturing the TS packets in each transport stream of data and performing continuous counting wrong statistics, outputting one transport stream of data with fewer errors as a main path, and discarding or taking the other transport stream of data with the same time for standby application. The invention discloses a code stream switching technology based on a transport stream base layer; the seamless switching on the objective sense is realized; and the receiving time delay error caused by the difference of channels and modulation modes are effectively evaded.

Description

technical field [0001] The invention belongs to the technical field of signal switching, and relates to a method for switching digital television signals, in particular to a method and system for seamlessly switching dual-channel digital television signals based on transmission streams. Background technique [0002] For analog TV, the switching between the two signals is generally completed during the field blanking period. For digital TV, because the signal is completely digitized, and the image and sound have been compressed and encoded, and the compression must comply with different standards, it is difficult to achieve digital. Seamless switching of TV signals at the program level. A simple understanding of seamless switching is that the stream after switching has no traces of splicing, either subjectively or objectively, just like the complete encoding process of the original video and audio data. Contents of the invention [0003] In view of the shortcomings of the ...

Claims

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Application Information

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IPC IPC(8): H04N21/434H04N21/435H04N21/8547
Inventor 戴懿贺章丽君王斌
Owner 上海东方富联科技有限公司
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