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  rolling down
    In this article it is explicitly pointed out that the transition from 2FSK to MSK is a change from a binary digital modulation to a quaternary digital modulation and the development from QPSK、OQPSK、MSK to GMSK is to analyse the change of the frequency spectrum rolling down of the digital modulation signals.
    2FSK过渡到MSK是二进制数字调制变化为四进制数字调制; 同时,从QPSK、O-QPSK、MSK到GMSK的演变,分析数字已调信号频谱滚降低特性的变化
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  rolling down
A disk rolling down a given slope is taken as a simple example, for which it is the goal of the optimization to shape the rolling contour of the disk such that it takes a minimum time to cover a certain distance.
      
At the spots which are occupied by droplets, heat is taken away due to the rolling down movement of the droplets.
      
Golden Ten is an observation game which is played with a small ball rolling down in a large bowl.
      
Rolling down from the 30 keV peak: Modelling the Hard X-Ray and γ-Ray Backgrounds
      
Fractures of the trunk in males were probably caused by impact forces against their shoulders or hips or both caused by rolling down a steep slope or falling out of trees, perhaps during intertroop transfers.
      
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In this article it is explicitly pointed out that the transition from 2FSK to MSK is a change from a binary digital modulation to a quaternary digital modulation and the development from QPSK、OQPSK、MSK to GMSK is to analyse the change of the frequency spectrum rolling down of the digital modulation signals.

2FSK过渡到MSK是二进制数字调制变化为四进制数字调制;同时,从QPSK、O-QPSK、MSK到GMSK的演变,分析数字已调信号频谱滚降低特性的变化

 
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