石油钻采工艺专利名称：Feed forward circuit 发明人：Andrew F. Folkmann 申请号：US06/334859
申请日：19811228
公开号：US04450417A
公开日：
成就小故事19840522
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摘要：A feed forward circuit that can be ud as an isolator or filter includes a first and a cond directional coupler that, depending on the application, either splits an applied signal into two paths or combines the two paths to obtain an output signal. One path includes an electronically tunable band reject filter (or notch filter) which may be bypasd by a switch in the isolator application, and an inverting amplifier. The cond path includes a delay line that compensates for the time delay of the signal in the first path due to the time delay of the inverting amplifier and electronically tunable band reject filter.响度和音调的区别
申请人：ROCKWELL INTERNATIONAL CORPORATION
代理人：Richard K. Robinson,George A. Montanye,H. Fredrick Hamann
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