| 摘要 |
PURPOSE:To realize stereophonic and monaural combinational use by using double winding consisting of a group A and a group B and putting the L and R outputs of the group A antiphase with the L and R outputs of the group B. CONSTITUTION:Winding B1 and winding A1, and winding B2 and winding A2 are coupled mutually preferably as close as possible, so the so-called bifilar winding is ideal, but up and down superimposing winding or left and right line winding may be employed as far as necessary coupling within an in-use frequency range is obtained. The winding B1 and winding B2 are connected in antiphase relation with the A-winding side and the L and R outputs are synthesized in phase to obtain a vertical oscillation output. In this case, horizontal leakage to the vertical output side is <-30dB and only a stylus noise is obtained, so this is added to a main signal in antiphase relation to cancele the noise. A double variable resistor VR is used to find the best phase and intensity of a cancelling output. |
