说明：  ASK调制与解调VHDL程序及仿真 FSK调制与解调VHDL程序及仿真 PSK调制与解调VHDL程序及仿真 MASK调制VHDL程序及仿真已经调试好的程序
(ASK Modulation and Demodulation Simulation of VHDL procedures and FSK modulation and demodulation procedures and VHDL simulation PSK modulation and demodulation procedures and VHDL simulation MASK modulation VHDL simulation procedures and good procedures have been debug)