Design of digital broadcast telephone system of coal mine

This paper analyzes the existing drawbacks of broadcast telephone system of coal mine, and introduces a design scheme of digital broadcast telephone system of coal mine based on TCP/IP protocol and Texas Instruments (TI) TMS320DM642 digital processor. The system makes use of audio codec chip TLV320AIC23B to achieve audio codec and adaptive anti-noise algorithm so that the output audio´s quality could be good to meet requirements of the voice in the mine, and then takes advantage of seamlessly connectivity between EMAC and physical layer chip Intel LXT971 to complete digital audio signal transmission based on embedded-based TCP/IP protocol stack. In the System software portion, the system integrates audio collection task, audio processing task, network transmission and other tasks by RF5 in the DSP/BIOS. And this paper analyzes the development process of network transmission using the network development kit (NDK). In the telephone terminal audio signal can be output through speakers or headphones to achieve high-quality voice communications under mine.