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1.
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它采用正交调制与数字上变频方法，可以生成多种中频调制信号。
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2.
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论证了高压变频器的应用于煤矿主扇风机的系统改造，必将取得良好的运行效果和经济效益。
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3.
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主要介绍TDc控制系统在现场总线通讯模式下的设置及应用，aBB变频器的控制字和状态字，以及通讯协议。
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4.
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以盱眙产优质凹凸棒石粘土为研究对象,用变频式行星球磨机对其进行超细粉碎.
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5.
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最后，本文给出了QPSK解调系统的性能仿真以及数字下变频和定时同步部分的FPGa实现。
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6.
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进口变频器控制采用进口部件组装而成的水冷主轴电机，噪音低，寿命长，维护成本更低。
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7.
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目前轴流式通风机在煤矿是普遍的主通风设备，文章阐述了变频器在轴流式风机中的应用，以解决主扇调整风量和节能降耗的问题。
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8.
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本文介绍了一种数字式下变频器的控制系统.
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9.
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本文提出一种基于多相滤波结构的正交数字下变频方案，通过计算机和DSP仿真，证明了它的可行性。
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