A signal conversion device includes a first converting section configured to convert a clock signal input through a first signal line, a data signal input through a second signal line, and a control signal input through a third signal line, into pulse signals including a first pulse train and a second pulse train; and a transmitting section configured to transmit the first pulse train through a fourth signal line and the second pulse train through a fifth signal line, wherein the control signal is a signal that, through a level transition, causes a control target device to switch between an active state and an inactive state, and wherein the first converting section is configured to put successive pulses into at least one of the first pulse train and the second pulse train in response to the level transition of the control signal.