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A stream text transmission method

A transmission method and text technology, which is applied in the field of network information transmission, can solve problems such as inability to guarantee reception quality and increase bandwidth overhead, and achieve the effect of saving bandwidth overhead and ensuring reception quality

Active Publication Date: 2008-08-06
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Such multiple encapsulation and packaging greatly increase the bandwidth overhead. In addition, the MPEG4 streaming text actually forms two sets of synchronous time stamps in the MPEG2 transport layer, which also increases the bandwidth overhead
Also, MPEG4 streaming text does not give different error protection to the TTU (timed text unit, synchronous text unit) defined by it, so the receiving quality cannot be guaranteed

Method used

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Embodiment Construction

[0017] A kind of streaming text transmission method provided by the present invention comprises the following steps:

[0018] (1) Text samples are packaged into multiple TUs (text units), and TUs have three different importances. The TU-A with the highest importance contains descriptions of text samples and text-related scene descriptions. The text strings are of medium importance and can be packed into multiple TU-Bs according to their length. The TU-C with the lowest importance is a text modifier, and TUs with different importance have different CRC detection and protection methods for bit errors. The TU of TU-A is put into PES (packetized elementary stream) separately, and the PES CRC flag of PES is set to "1".

[0019] (2) The same part of TU-B and TU-C described by the same TU-A is placed in the common description (common description or CD for short) field, and if the TU-B and TU-C corresponding to TU-A If there is a change in the description in TU-B, the change will be...

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Abstract

The invention relates to a method for transmitting a streaming text. The method of the invention provides a method for directly mapping a 3GPP streaming text to a transport layer in order to realize the streaming text transmission with high efficiency and low broadband expenditure. The invention provides a method for bearing the difference text timestamp and the synchronization by a PES, which can save the expenditure of the broadband. The invention provides a method for detecting and packing a TU with different importance and different error codes CRC, which guarantees the receiving quality.

Description

technical field [0001] The invention relates to the technical field of network information transmission, in particular to a streaming text transmission method. Background technique [0002] The existing MPEG4 streaming text (MPEG4 streaming text) transmission method provides a general streaming text transmission solution. However, since the streaming text is packaged through the MPEG4 streaming text, it needs to be encapsulated in the synchronization layer (SL), and then carried by the MPEG2 transport layer. Such multiple encapsulation and packaging greatly increase the bandwidth overhead. In addition, the MPEG4 stream text is actually carried by the MPEG2 transport layer to form two sets of synchronous time stamps, which also increases the bandwidth overhead. In addition, MPEG4 streaming text does not give different bit error protection to its defined TTU (timed text unit, synchronous text unit), so the reception quality cannot be guaranteed. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L12/56
Inventor 丁亚强康一
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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