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Multiplex apparatus and multiplex method

A technology of multiplexing device and multiplexing frame, which is applied in the direction of pulse modulation TV signal transmission, etc., can solve the problems of inability to multiplex video and audio, loss of video data, and degradation of video quality.

Inactive Publication Date: 2009-01-07
新奇点智能科技集团有限公司
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Problems solved by technology

[0006] In this way, when the output code rate of the video encoder increases, the input code rate input to the multiplexer also increases accordingly, when the code rate exceeds the capacity of the logical channel When the multiplexer cannot perform normal multiplexing on the video and audio, the transmitted video data will be lost. In the case of a large picture change, the video quality may be greatly reduced.

Method used

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no. 1 approach

[0044] In this embodiment, video frames that exceed the capacity of the logical channel are multiplexed in the next multiplex by buffering the video frames to solve the problem of video quality degradation caused by video frames being discarded due to the capacity of the logical channel. In addition, in order to prevent A large number of video frames are piled up in the buffer to cause problems such as picture delay, and a video frame deleter is set to selectively delete the video frames in the video frame buffer. Therefore, even if the video frame bit rate exceeds the logical channel capacity for a long time, high-quality pictures can be provided for the terminal.

[0045] Specifically, as figure 2 As shown, the multiplexing device of the first embodiment of the present invention includes a video and audio preprocessor 21 , a video buffer manager 22 , a video frame buffer 23 and a multiplexing framer 24 . The video and audio preprocessor 21 synchronizes the input video and ...

no. 2 approach

[0083] The difference between this embodiment and the first embodiment is that an audio frame buffer is added, and audio frames and video frames are managed synchronously, so as to improve the synchronization of multiplexed transmitted images and sounds while improving video quality sex.

[0084] Specifically, as Figure 5 As shown, the multiplexing device in this embodiment includes a video and audio preprocessor 51 , a video and audio buffer manager 52 , a video frame buffer 53 , a multiplexing framer 54 and an audio frame buffer 55 . Wherein, video and audio preprocessor 51, video frame buffer 53 and multiplexing framer 54 are respectively connected with figure 2 The shown video and audio preprocessor 21, video buffer manager 23 and multiplex framer 24 have the same functions. Next, the buffer manager 52 and the audio frame buffer 55 which are different from those of the first embodiment will be mainly described.

[0085] The video and audio buffer manager 52 stores the...

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Abstract

The invention relates to a multiplex device and a multiplex method in a communication system. A video and audio multiplex device of the invention receives video and audio data and then builds the video and audio data into multiplex frames for multiplexing, and comprises a video and audio preprocessor, a cache manager, a video frame buffer and a multiplex framer, wherein, video frame data in the video and audio data sent by the video and audio preprocessor is stored into the video frame buffer by the cache manager and the video frame with a certain data size is taken out from the video frame buffer in sequence by the cache manger and is sent with the audio data sent by the video and audio preprocessor to the multiplex framer. Furthermore, the video frame obtained from the video frame buffer is controlled so as to ensure that the sum of the capacities of the obtained video frame and the audio data sent by the video and audio preprocessor in the multiplex frame is less than or equal to the capacity for containing the video and audio data in the multiplex frame. By adopting the invention, the quality of the transmitted video when an input code rate exceeds bandwidth which can be provided by a logic channel can be improved.

Description

technical field [0001] The invention relates to a multiplexing device and method for multiplexing video and audio data in a communication system, in particular to a multiplexing device and method for multiplexing video and audio data in a mobile multimedia broadcasting system. Background technique [0002] As an important module of the digital multimedia broadcasting transmitter, the multiplexer is responsible for multiplexing and sending information in various formats according to the specifications. like figure 1 As shown, the most important service in the multimedia broadcasting system-the information processing flow of video and audio data is divided into the following steps: 1. The TV program is sent to the video and audio encoder; 2. The video and audio encoder proceeds according to the set parameters Video and audio encoding; 3. The video and audio encoder sends the encoding result to the multiplexer in the form of RTP stream; 3. The multiplexer receives the video an...

Claims

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Application Information

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IPC IPC(8): H04N7/52
Inventor 张辉王西强李刚肖兵郭洛玮吕义柱邹畅捷
Owner 新奇点智能科技集团有限公司
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