正交检波 orthogonal detection
- 数字正交检波技术能够较好地提取信号的幅度和相位参数,保留信号包络中的所有信息。
Digital I/Q demodulation picks up the amplitude and phase of signal and remains all the information intact under the signal envelope. - 正交检波方法既能给出灰度超声成像所需要的回波的幅值信息,也能给出多普勒超声成像所需要的回波的相移信息。
Orthogonal detection can give us both the amplitude information for gray-scale imaging and phase shift information for doppler spectrum analysis. - 结合对带通采样定理的理解,讨论了直接中频带通信号采样正交检波的基本原理,重点探讨正交混频低通滤波法和希尔伯特变换频移法。
Fundamentals of IF(Intermediate Frequency) bandpass signal sampling and quadrature detection are discussed, especially the coherent mixing LPF method and Hilbert transform frequency-shift method.
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