Aimed at 2dpsk modulation, the cross spectra demodulation method that obtains relative phase information through calculating the cross spectra of two neighboring symbol signals is proposed.
针对2 DPSK调制方式，提出了通过对相邻两个码元信号求互谱来获取相对相位信息的互谱解调法。
2
In addition to alternating phase difference between two aims of interferometer, the intensity of light of the interference fringes will vary in the same frequency, which is called as phasemodulation.
当两相干光附加一按固定频率变化的相位差时，其干涉条纹的光强将随之交变，即为相位调制干涉。
3
The mechanism of phasemodulation is investigated based on the model of two degree of freedom in the thermoacoustic prime mover consisting of a looped tube and the resonator.