This paper studied the three-phase PWM(pulse width modulation) rectifier in dual PWM variable frequency speed regulation system.

对双PWM变频调速系统中的三相PWM整流器及其控制方法进行了研究。

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This paper presents a new dual-amplitude pulse position modulation (DAPPM) on the basis of PPM.

针对该问题，提出了一种新的双幅度脉冲位置调制(DAPPM)。

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At last it discusses the dual-mode transmission technology of the Ultra Narrow Band Modulation and the FM combination.

最后着重讨论了超窄带调制与FM结合的双模式传输技术。

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