Design And Implementation Of Analog Audio And Video Signals Acquisition System

Digital signal processing technology has been widely used in various fields,with the rapid development of digital computer,multimedia technology,information technology and industrialization.By using digital signal processing technology,we can analyse signal,improve the quality of signal and display signal.Digital signal processing technology has a great demand in the market.High quality video and audio signals should be used in security monitoring system and real-time video communication system.Intelligent and networked analog audio and video signals acquisition system will be developed in the future.An analog audio and video signals acquisition system is designed in this paper.The system is based on Da Vinci technology and digital image processing technology,and it uses TMS320DM365 chip as the core processor and uses TVP5146M2 and TLV320AIC3101 as acquisition chip.The hardware circuit of the system is composed of video acquisition module,audio acquisition module,power management module,serial port debugging module and Ethernet communication module.In software design,Linux V4L2 framework and ALSA framework are analysed,chip registers configuration is finished according to system requirements.The I2 C device drivers for video sampling chip TVP5146M2 and audio sampling chip TLV320AIC3101 are implemented.The input analog audio and video signals are converted into digital signals by the system,and transmitted to TMS320DM365 processor.Digital signal processing and the playback of audio and video signals are realised by TMS320DM365 processor.The test results show that the analog audio and video signals acquisition system proposed in this paper can realize acquisition of analog PAL/NTSC SYS,CVBS and S-Video video signals and audio signals.The system can be used in video monitoring equipments.The system designed in this paper is low cost,low power consumption.It is a high practical value equipment.