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Digital television PSI/SI information distributing system and method

A digital TV and data packet technology, applied in the components of TV system, pulse modulation TV signal transmission, TV and other directions, can solve the problem of heavy CPU load and affect processing of other tasks, and achieve the effect of reducing load

Inactive Publication Date: 2010-12-22
长沙闿意电子科技有限公司
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Problems solved by technology

[0003] In order to solve the technical problem that the existing embedded system sends PSI / SI information through the CPU and causes the CPU load to be too large, which affects its processing of other tasks, the present invention provides a method that can effectively solve the problem that the CPU is overloaded when sending PSI / SI information. Large, so that PSI / SI information can be sent strictly according to the technical scheme of the sending interval standard

Method used

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  • Digital television PSI/SI information distributing system and method
  • Digital television PSI/SI information distributing system and method

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Embodiment Construction

[0028] see figure 2 The write buffer control module is composed of two sets of registers, the packet attribute register and the write buffer register, and the address mapping table module. The CPU writes the packet to be sent into the write buffer register, and at the same time writes the packet attribute into the packet attribute register. After the preparation is completed, The CPU will write the control position, the main control module responds to the write request, controls the memory control module, transfers the data packet to SDRAM, calculates the SDRAM address according to the packet attribute, and writes it into the address mapping table.

[0029] The write buffer register is implemented by dpram with a data bit width of 32 bits and an address bit width of 6 bits. Only one packet of 188 byte length or 204 byte length is allowed to be saved at a time, and unused addresses are reserved for registers to save CPU address bit width resources.

[0030] see image 3 The i...

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Abstract

The invention discloses digital television PSI / SI information distributing system and method. The system comprises a CPU, a TS stream output channel, a buffer control module, a distribution timing control module, a port polling control module, a combined buffer and continuity counting processing module, a system main control module and an SDRAM (Synchronous Dynamic Random Access Memory). Tasks of sending PSI / SI information, processed by the CPU originally, are contributed by hardware in a digital television embedded system to ensure that the CPU preferably processes and sends PSI / SI data packets without interrupting other tasks, thereby greatly lowering the load of the CPU, and ensuring that the requirement for interval accuracy of sending the PSI / SI data and the stability and the reliability of the system.

Description

technical field [0001] The invention relates to a digital TV PSI / SI information packet sending system and method. Background technique [0002] When the embedded system is applied to the digital TV front-end equipment, the processing and forwarding of the program information and PSI / SI are usually processed and analyzed by the processor, that is, the CPU. Since there will be a large amount of information to be processed when the machine is working, this is It brings a high load to the embedded processor, especially when sending these information, there is a certain delay between the CPU interrupt and the sending, especially in the operating system of the pre-emptive multitasking mechanism, there is a time delay when the CPU tasks are switched The problem of inaccuracy will affect the transmission interval and accuracy of PSI / SI information, causing a large amount of PSI / SI information to be sent in real time, and will also cause certain impact and interference on the PCR adj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N5/00
Inventor 丁泽湘王宁昌
Owner 长沙闿意电子科技有限公司
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