Multichannel video system on basis of 1394b optical bus and data collecting and transmitting method thereof

Abstract

The invention provides a multichannel video system on the basis of 1394b optical bus and a data collecting and transmitting method thereof, which belong to the technical field of the 1394b optical bus. The multichannel video system comprises a video collecting unit and a video transmitting unit, wherein the video collecting unit comprises a DSP (digital signal processing) chip, video decoding chips, a flash memory, a synchronous dynamic random access memory, a PCI (peripheral component interconnect) interface A and a JTAG (joint test action group) interface, and the video transmitting unit comprises a PowerPC (performance optimization with enhanced reduced instruction set computer-performance computing) module and a 1394b interface protocol module. An embedded microprocessor is utilized to acquire videos, relying on a master controlling computer is avoided, the load to the master controlling computer is lowered, and reliability of the system is improved. The specified DSP chip for video image is utilized, multiple video ports can be provided, so that multichannel videos are realized with a single chip, systematic resources are fully utilized, the circuit design is simplified, and the cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of 1394b optical bus, and specifically refers to a multi-channel video system based on 1394b optical bus and a data collection and transmission method thereof. Background technique [0002] With the development and popularization of microcomputers, the mode of modern video image acquisition is becoming more and more high-speed, small and simple. In order to meet the increasingly high video quality requirements in applications, people often use software to control and process video. However, the software is limited to the configuration of the computer, which makes the video image processing speed slow, real-time performance is poor, and the price is high. The hardware system with FPGA, DSP, ARM and other microprocessors as the core can also be used for acquisition, which brings a new way to solve this problem. [0003] In recent years, in the high-speed signal acquisition and processing technology, the FPGA...

AI Technical Summary

Problems solved by technology

Due to the use of FPGA to control data acquisition, a system can only be connected to one set of data acquisition devices (including cameras or cameras, analog-to-digital conversion chips, etc.), therefore, only one data signal can be collected at the same time, wasting a lot of resources of the system ;

[0011] 2. Slow transmission speed

Due to the use of FPGA to control data transmission and data conversion, it cannot be connected to the 1394b link layer chip

The 1394a link layer chip is used in the system, so the maximum transmission speed of the system can only reach 400M / s, which is only half of the 1394b bus

[0012] Based on the above reasons, this technology has disadvantages such as low work efficiency and waste of resources, which is not conducive to the wide application of video systems and the promotion of IEEE 1394 optical bus

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