角度调制是频率调制和相位调制的总称。角度调制是使正弦载波信号的角度随着基带调制信号的幅度变化而改变。
两种调制方式都表现为载波信号的瞬时相位受到调变, 故 统称为角度调制( angle modulation) , 简称调角 [ 3] 。
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ECG调制不能与其它一些类型管电流调制相组合.如角度调制(angular modulation)。虽然在心脏CT检查中可能使用Z轴调制。
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信号经过角度调制后,频谱结构将发生变化,频谱分析是处理信号的重要步骤和必要的保证。
The signal, after the Angle modulation, would change in its spectral structure. And the analysis on its frequency spectrum is an important and necessary step for signal processing.
常用的调制方式使用正弦波作为载波并对其进行幅度调制(AM)和角度调制即调频(FM)或调相(PM)。
In frequently used methods, sine wave is used as carrier with amplitude modulation (am), frequency modulation (FM) and phase modulation (PM) implied.
因此,在调制式旋转导向工具中,就必须设置一个不受钻柱影响的、可以自动保持和调整工具面角度的稳定平台。
So, it is necessary to have a stabilized platform in the tool to obtain steady angle adjustable and independent to the rotation of drilling string.
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