高频课程设计——无线门铃的设计本设计主要讨论用红外来传播信号，实现短距离的无线的要求。要设计出发射和接受电路，以及解调电路，发音电路等。-High curriculum design- the design of the wireless doorbell to discuss the design of the main transmission of infrared signals to achieve short-range wireless requirements. To design the transmitting and receiving circuit, and the demodulation circuit, voice circuit.