(EN) The purpose of the present invention is to obtain a signal transmission circuit which outputs an external output signal that accurately reflects an external input signal. A first circuit (100) according to the present invention outputs transmission signals (VS and VR) that change between "H" and "L" in the period of an oscillation signal (CLK) in addition to transitions to "H" and "L" of an inputsignal (XIN). Control protection elements (23S and 23R) disable induced voltage signals (RX1 and RX2) obtained from transformers (10 and 20) in response to the transmission signals (VS and VR) duringfirst and second mask periods. Buffer circuits (24S and 24R) and Schmitt circuits (25S and 25R) generate a signal (VS2) and a signal (VR2) that indicate "H" for a relatively long time on the basis of"H" of the induced voltage signals (RX1 and RX2). A control circuit 26 disables the signal (VS2) and the signal (VR2) when both the signals (VS2) and (VR2) indicate "H".
(ZH) 本发明的目的在于得到输出准确地反映外部输入信号的外部输出信号的信号传输电路。而且，本发明的第1电路(100)除了输入信号(XIN)向“H”、“L”转变时之外输出在振荡信号(CLK)的周期内在“H”以及“L”之间变化的发送信号(VS以及VR)。控制保护元件(23S以及23R)响应于发送信号(VS以及VR)而使从变压器(10以及20)得到的感应电压信号(RX1以及RX2)在第1以及第2屏蔽期间无效。缓冲器电路(24S以及24R)及施密特电路(25S以及25R)根据感应电压信号(RX1以及RX2)的“H”来生成较长地指示“H”的信号(VS2)以及信号(VR2)。控制电路26在信号(VS2)以及(VR2)都指示“H”时，使信号(VS2)以及信号(VR2)无效。
