| 摘要 |
PURPOSE:To cancel the noise and the magnitude and to obtain desired signal components with a simple constitution, by adding or subtracting outputs of amplifiers in accordance with the output of a phase comparator. CONSTITUTION:Coils 3 and 4 for transmission are connected in series between output terminals of an amplifier 2. Coils 5 and 6 for detection are arranged orthogonally to each other, and outputs induced by coils 5 and 6 are sent to amplifiers GX and GY. Noise components in outputs pass through a comparator 11 which compares phases, and outputs of amplifiers 7 and 8 are subtracted in case of the same phase, and they are added in case of phases opposite to each other. Thus, the noise and the magnitude of an output K0 of the system are cancelled even if they are changed, and desired signal components are obtained. |
