(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。