DISEQC DEVICE AND TRANSMITTING AND RECEIVING CIRCUIT THEREOF

摘要

A DiSEqC device and a transmitting and receiving circuit thereof. The transmitting and receiving circuit comprises: a switch control module, a switch module, an LC resonance module, a signal conversion module and a shaping module. When a set-top box sends a control signal, the switch control module controls the switch module so that same is turned off or on according to the control signal, and the set-top box outputs a control signal to an controlled end correspondingly through the LC resonance module or the switch module according to the switch module being turned off or on; and when the set-top box receives a feedback signal of the controlled end, current-voltage conversion is performed on the feedback signal via the signal conversion module after which a corresponding AC voltage signal is output to the shaping module, and the shaping module performs reverse shaping on the AC voltage signal and then outputs a square wave level signal to the set-top box, and the set-top box receives feedback information about the controlled end.