Descriptions：Based on the communication system of amplitude modulation of envelop demodulation is functioned through modulating baseband signal in the transmitting end and proceeding on envelop detection to mudulated Thus revert the modulating AM (amplitude modulation) integrated modulating signal into high frequency signal by means of changing modulating signal into the amplitude of high frequency Then send the high frequency signal via That is，the modulated signal-radiation is Envelop demodulation，is also called envelop detection，which is a process of collecting modulating signal form the envelop of amplitude-modulated The concrete process is:First，conduct rectifying for amplitude-modulated weave，getting the pulsating leaded by the change of envelop
