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Code stream time base discontinuous processing method and code stream receiving apparatus

A technology of receiving device and code stream, applied in the direction of TV, electrical components, pulse modulation TV signal transmission, etc., can solve problems such as loss, aggravate decoding or playback skip or interruption, pause, limit the clock adjustment accuracy of the decoding end, etc. Gap effect

Inactive Publication Date: 2008-05-14
SHANGHAI MAGIMA DIGITAL INFORMATION
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AI Technical Summary

Problems solved by technology

Changes in the time base may cause buffers waiting to be decoded or played to overflow, losing some frames of audio, video streams or data, and further aggravate the phenomenon of decoding or playing irregular jumps or interruptions, pauses, etc.
[0007] On the other hand, the minimum adjustment unit of PTS is 90KHz, which also limits the adjustment accuracy of the decoder clock when the time base changes

Method used

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  • Code stream time base discontinuous processing method and code stream receiving apparatus
  • Code stream time base discontinuous processing method and code stream receiving apparatus
  • Code stream time base discontinuous processing method and code stream receiving apparatus

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Embodiment Construction

[0041] see figure 2 , the present invention provides a code stream receiving device for processing a code stream with a discontinuous time base, which mainly receives an external multimedia transmission code stream, generally referred to as a transport stream (TS; TransportStream), and decomplexes the code stream After a series of processing such as using, parsing and decoding, the output is played. The device comprises a demultiplexing unit 21 , a decoder 22 , a synchronization unit 23 and a local system clock 24 . The decoder 22 may include an audio decoder 221 , a video decoder 222 and other data decoders 223 and the like. There can be one synchronization unit or multiple synchronization units corresponding to each decoder.

[0042] The demultiplexing unit outputs elementary stream packets (PES; Packetised Elementary Stream) after demultiplexing the transport stream, and sends them to each decoder.

[0043] Such as image 3 As shown, each decoder includes at least a buf...

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Abstract

The invention discloses a method for processing in continuous time base of bit stream and a device for receiving bit stream; wherein, the bit stream receiving device includes a demultiplexer unit used for demultiplex of base stream packet transmitted in the bit stream; marking related positions of the bit stream as synchronous in continuous points of the bit stream after receiving an in continuous instruction of the bit stream, and giving a notice of in continuous time base. A decoder which has an in continuous register is also contained by the invention. The decoder responds to the notice of in continuous time base; the in continuous register is in the first work status and then in the second work status when the marked position of the bit stream is decoded. The invention also contains a synchronous unit which sets the in continuous register in the first work status and closed the synchronous operation when receiving the in continuous notice, and starts the synchronous operation after the in continuous register is in the second work status. Furthermore, the invention includes a system clock as well which conducts renewal operation when the synchronous operation of the synchronous unit is closed.

Description

technical field [0001] The invention relates to a device and method for receiving digital audio and video data streams, in particular to a method for processing discontinuous time bases in code streams and a code stream receiving device using the method. Background technique [0002] Multimedia communication technology has received widespread attention and development in recent years, especially real-time audio and video transmission technology is closely related to people's quality of life, and has broad market prospects all over the world. Audio and video transmission technology often requires a large bandwidth to achieve the purpose of real-time transmission. In order to reduce the demand for bandwidth, various corresponding codec technologies have emerged as the times require. The MPEG series of standards define a widely used audio and video codec technology. In the MPEG series standards, the sending end compresses the data according to a certain coding principle and pa...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/24H04N7/62H04N7/60H04N7/52
Inventor 周振亚陈宏亮沈悦张亚林
Owner SHANGHAI MAGIMA DIGITAL INFORMATION
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