| 摘要 |
PURPOSE:To cancel the crosstalk between rotary transformers by changing gains of outputs of each channel reproduced via the rotary transformers having plural channels relatively and mixing them. CONSTITUTION:An output A+BK is obtained at an output of an amplifier 5 and an output B+KA is obtained at an output of an amplifier 6 (A, B are outputs of heads 1, 2, KA, KB are crosstalk of the outputs of the heads 1, 2 to the rotary transformers 3, 4, and K is the rate of crosstalk). In setting the attenuation of an attenuator 7 to K, the output of the attenuator is K(B+ KA)=KB+K<2>Aapprox.=KB. An output of the amplifier 5 is inputted to a non-inverting input of a differential amplifier 8 and an output of the attenuator 7 is inputted to an inverting input. Thus, the output of the differential amplifier 8 is A+ KB-KB=A, then only the output of the head 1 from which the crosstalk from the head 2 is eliminated is extracted.
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