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    • 10. 发明授权
    • Digital demodulator for a phase-modulated signal
    • 用于相位调制信号的数字解调器
    • US5818297A
    • 1998-10-06
    • US855189
    • 1997-05-13
    • Philippe Levionnais
    • Philippe Levionnais
    • H04L27/227H04L27/22
    • H04L27/2276
    • The demodulator is for processing a signal having a carrier modulated by (0, .pi.) phase shifts and sampled at a rate that is at least twice the frequency of the carrier co. It comprises, in cascade: a first multiplier for squaring successive samples e(t), a phase locked loop adjusted to the frequency of the carrier, thereby performing programmable digital filtering; a divider for dividing the frequency by two, reconstituting the carrier from the output of the phase locked loop; a second multiplier receiving the sampled input signal and the output signal from the divider and an output lowpass digital filter. A phase adjustment circuit is placed upstream of one of the inputs of the second multiplier.
    • 解调器用于处理具有由(0,pi)相位调制的载波的信号,并以至少是载波co频率的两倍的速率进行采样。 它包括级联:用于对连续样本e(t)进行平方的第一乘法器,调整到载波频率的锁相环,从而执行可编程数字滤波; 用于将频率除以2的分频器,从锁相环的输出重构载波; 接收采样输入信号的第二乘法器和来自分频器的输出信号和输出低通数字滤波器。 相位调整电路位于第二乘法器的输入之一的上游。