Design method of audio and video data acquisition interface circuit

Abstract

The invention provides a design method for an interface circuit of an audio and video data acquisition system, transmission and cache units are designed in an FPGA (Field Programmable Gate Array), so that stable and accurate transmission of data can be guaranteed when a video format and a video frame rate change. A DM365 data compression unit is arranged at an audio and video data acquisition output end, the FPGA is adopted to form information cache and transmission modules, the cache region module is connected to the DM365 data compression unit through an SPI (Serial Peripheral Interface) one-way communication bus and an EMIF (External Memory Interface) both-way communication bus and is connected to an upper computer through a PCI (Peripheral Component Interconnect) bus; a function configuration information cache region, a pipeline configuration information cache region, a broadcast time cache region and a compressed data two-stage cache region are arranged in the FPGA. A simulation result shows that the audio and video data acquisition circuit meets the requirements for transmission at different video formats, P / I frame rates, frame rates and data rates and has a low error rate, and the method is applied to various data acquisition systems with rate variation.

Description

technical field [0001] The invention belongs to the technical field of circuit design, and mainly relates to the design and realization of an interface circuit of a collection system, in particular to the design and realization of an audio and video data collection interface circuit. FPGA buffering and PCI bus transfer of compressed audio and video data can be realized. Background technique [0002] Audio and video data collection is a very popular streaming media technology today. As the name suggests, streaming media technology is to digitally compress the collected video or audio information to form a streaming file format. This format is generally used to transmit or store information files, and to play streaming media files in a certain way when necessary. This involves many technologies: including audio and video acquisition and quantization, color space conversion, analog-to-digital conversion, audio and video compression, audio and video packaging, and audio and vid...

AI Technical Summary

Problems solved by technology

[0005] There are also many designs for this series of chips at home and abroad, but their prices are generally too high, and the development technology is not transparent, so it is very difficult for users to carry out follow-up development after purchasing.

Although TI's Chinese partners Hezhongda and Ruitai have launched development boards based on Da Vinci technology, they only provide individual compression routines and cannot be used as a mature design for audio and video compression.

Our country has not yet formed a large-scale application case in this regard, especially in the military industry, mainly because the key technologies are controlled by some foreign large-signal processing companies, and there is still a big gap before formal mass production

Images