双信号单通道红外光传输

以FPGA作为控制核心,设计了一种脉冲频率调制(PFM)与脉冲宽度调制(PWM)对信号先后调制,并用红外光来进行同时传输的装置。发送端通过FPGA自带的高速AD对音频信号采样,通过PFM与PWM来实现音频信号的调制,接收端FPGA对光脉冲进行解调输出。设计中发射电路与接收电路完全采用分离元件进行构建,具有成本低、功耗小、传输效率高等优点。通过对设计结果的分析可以得到在12 m内,1～10 kHz的音频信号和数字信号能够在一个通道里进行无失真的实时传输。传输信号经过中继站实现信号向不同方向转发的功能。同时中继站的功耗为0.08 W,满足节能的要求。

Dual signal single channel infrared light transmission

Taking FPGA as the control core,a dual signal single channel transmission device was designed.The pulse frequency modulation(PFM) and pulse width modulation(PWM) are used to modulate the signal,and simultaneous transmission is achieved by infrared light.The audio signal is sampled by high-speed AD of FPGA at transmitting end,and then the audio signal modulation is achieved through the PFM and PWM;the optical pulse is demodulated and output by FPGA at the receiving end.The transmission circuit and the receiving circuit adopts complete discrete components,and it has the advantages of low cost,low power consumption and high transmission efficiency.The design results show that 1 ~10 kHz audio signal and digital signal can be in a channel for real-time transmission without distortion within 12 meters.Transmission signal can transmit to the different directions after crossing the relay station,and the relay station power consumption is only 0.08W,which meet the energy requirements.