Chip of system for decoding audiovisual frequency in digital TV

An audio and video decoding and system chip technology, which is applied in the field of digital TV audio and video decoding system chips, can solve the problems of low CPU processing capacity, inability to carry out further expansion and development, and few interfaces, so as to enhance competitiveness and facilitate secondary development. , cost-effective effect

Inactive Publication Date: 2005-11-16
杭州晶图微芯技术有限公司
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Problems solved by technology

However, there are still many problems, such as low CPU processing power and fe

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  • Chip of system for decoding audiovisual frequency in digital TV
  • Chip of system for decoding audiovisual frequency in digital TV
  • Chip of system for decoding audiovisual frequency in digital TV

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[0017] The following describes the present invention in detail based on the drawings and embodiments, and the purpose and effects of the present invention will be more clear.

[0018] The digital TV audio and video decoding system chip of the present invention adopts the expandable MASTER group and SLAVE group structure, and realizes the audio and video processing structure based on the MPEG2 standard. The overall structure of this chip is as figure 1 Shown. The system receives the transport stream (TS) from the pulse width modulator Tuner. The conditional access module first descrambles and demultiplexes the transport stream to obtain the transport stream corresponding to the program selected by the user, and then performs decryption processing to separate the audio elementary stream and video respectively Basic flow. The conditional access module stores the decoded audio and video elementary streams into the audio and video elementary stream buffer of the SDRAM respectively. Af...

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Abstract

The chip is composed of following parts mainly: CPU, conditional receiving module, audio/video decoder, post-processing module for video, audio/video output module, bus and clock management, external memory controller, and general purpose interface etc. Data interaction of these parts is carried out through system bus and general bus mainly. The disclosed chip possesses low requirement for system frequency to realize normal decoding audio/video for example at system clock 54MHz. Features are: low power consumption, low requirement for SOC design technology, and high ratio between performance and cost. The chip possesses abundant interface functions and built in 32 bits RISC CPU, which is in favor of users to carry out development in second times.

Description

technical field [0001] The invention relates to the fields of audio and video multimedia processing, digital TV, set-top box source decoding and the like, and in particular relates to a digital TV audio and video decoding system chip. Background technique [0002] At present, the main sources of digital multimedia processor chips such as digital TV audio and video decoding system chips are foreign manufacturers, such as ST, Philips, Fujitsu and other large foreign companies, typically ST's STi5518, STi5516 and Fujitsu's MB87M2141, etc. This type of chip has large scale, complex system and high cost. [0003] my country's digital media technology, application, and industry are developing extremely rapidly, and have become a bright spot in the development of the information industry. The prospect is very broad, but the supply of chips in the domestic digital TV and broadband product markets is insufficient. At present, only a few domestic companies can launch mature related c...

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Application Information

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IPC IPC(8): H04N5/00
Inventor 郭斌林莫国兵杨雪燕傅利泉朱江明
Owner 杭州晶图微芯技术有限公司
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