The principle of noise shutoff on "Noisecuttrans" is as follows:
The space of primary and secondary coils on transformer is insulated. The electrostatic capacity coupling between both coils is shutoff by shield. "Noisecuttrans" is composed that all electric surges are transferred by magnetic coupling. After that, magnetic flux of noise ingredient that is high-frequency is lost in magnetic path, does not link with the secondary coil and magnetic flux of low-frequency ingredient only links with the secondary coil. By means of these, the ingredient only around the fundamental wave of electric surge in the primary side is induced to and regenerated at the secondary side.

On the basis of this principle, our "Noisecuttrans" is produced with the following three items on construction:

1. The concern of position for the primary and secondary coils insulated fully is selected that the magnetic coupling due to air-core is difficult in occurring.
   
   
2. Each coil and the space between them are made electromagnetic shield strictly and in multiplicity, and the electrostatic capacity coupling is shutoff and the radiation is prevented.
   
   
3. Both coils are penetrated by the magnetic cores with material and shape that the effective permeability rapidly deteriorates in accordance with high-frequency, though the effective permeability is high in fundamental wave.

These three items are a base, and the most useful good are made by the way selected from the numberless combination of material and shape. Namely, "Noisecuttrans" is quite different in construction from the insulating transformer, shielded transformer, etc. for the elimination of common mode noise in low band.

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