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A kind of audio and video synchronization circuit and method based on mpeg-2 system layer standard

An audio and video synchronization, MPEG-2 technology, applied in the direction of electrical components, image communication, selective content distribution, etc., can solve problems such as error, large calculation overhead, poor effect, etc., to ensure quality and accuracy, and calculate time overhead small effect

Active Publication Date: 2017-12-22
AVIC NO 631 RES INST
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Problems solved by technology

[0005] However, in the MPEG-2 system layer standard currently adopted, the main solution is to use software to calculate the PTS and DTS time for audio and video at the encoding end and decoding end. A certain error, the effect is poor, and the calculation cost is large

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  • A kind of audio and video synchronization circuit and method based on mpeg-2 system layer standard

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Embodiment Construction

[0061] Based on the MPEG-2 system layer standard, the present invention proposes a hardware-framed audio and video synchronization processing circuit and method thereof, which realizes high-precision calculation of audio and video DTS and PTS, while ensuring the quality of audio and video synchronization, and greatly reducing the calculation overhead .

[0062] First of all, combined with figure 1 Describe the circuit structure of the present invention:

[0063] The audio and video synchronization circuit includes a system time generating unit, an audio PTS processing unit, and a video DTS and PTS processing unit;

[0064] The system time generating unit includes a frequency divider, an adder and a 33-bit system time register;

[0065] Specifically, the frequency divider is used to generate a 90KHz clock; the 90KHz clock is internally connected to the audio PTS processing unit, video DTS and PTS processing unit, and outputs external synchronized audio time sampling enable and video t...

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Abstract

The invention provides an audio / video synchronous circuit and method based on an MPEG-2 system level standard. The circuit comprises a system time generating unit, an audio DTS and PTS processing unit and a video DTS and PTS processing unit, wherein the system time generating unit comprises a frequency divider, an adding device and a 33-bit system time register, the frequency divider is used for generating a 90KHZ cloud, the audio PTS processing unit comprises an audio PTS time buffer unit and an audio PTS output effective register, and the video PTS processing unit comprises a video PTS time buffer unit and a DTS calculation unit and two video time output effective registers. The circuit and the method have the advantages that the DTS and PTS high-precision calculation can be realized, meanwhile, the audio and video synchronization quality is ensured, and the calculation expenditure is greatly reduced.

Description

Technical field [0001] The invention belongs to integrated circuit design technology, and relates to an audio and video synchronization circuit and method based on the MPEG-2 system layer standard. Background technique [0002] The simultaneous transmission of audio and video is an important sign of high quality of audio and video program transmission, and is a very special and important key technology in digital television technology and multimedia communication technology. [0003] With the further development of digital technology, network technology, communication technology, and multimedia technology and the widespread popularization of digital TV, user service quality requirements are getting higher and higher, and ensuring audio and video synchronization has become an important way to improve service quality. [0004] At present, the phenomenon of unsynchronized audio and video still exists. The main reasons for the unsynchronized audio and video include delay jitter, differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/24H04N21/8547H04N21/236
CPCH04N21/23602H04N21/242H04N21/8547
Inventor 安博锋许宏杰颜哲陈威宇卢俊王婷
Owner AVIC NO 631 RES INST
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