(EN)
A data transmission system is disclosed which including a source of a data signal and a modulator, responsive to the data signal, producing a first modulated signal representing the data signal and a second modulated signal representing a signal 180 out-of-phase with the data signal. The first and second modulated signals are transported via a transmission channel. A first demodulator demodulates the transported first modulated signal and a second demodulator demodulates the transported second modulated signal. A subtractor, responsive to the first and second demodulators, produces a signal representative of the data signal.
(ZH) 数据传输系统包括：数据信号源；调制器，产生具有第一和第二频谱分量的调制信号，第一频谱分量表示数据信号及第二频谱分量表示同数据信号相移180度的信号；传输信道，传送调制信号；向下变频器，将传送信号的传送的频谱分量分别转换为第一和第二中频；带通滤波器，有使传送信号的转换的第一和第二频谱分量通过的通带；第一解调器，对第一频谱分量解调；第二解调器，对第二频谱分量解调；第一加法器和第二加法器，产生表示数据信号的信号；第一低通滤波器和第二低通滤波器，使数据信号通过。
