| 摘要 |
PURPOSE:To reduce coupling noises induced from recording heads to reproducing head windings by inverting the phase of voltages induced at detection windings for recording head leakage magnetic flux and adding them to reproduced signals. CONSTITUTION:Reproducing heads each consisting of a reproducing magnetic circuit 10 and a winding 20 for the 1st channel 11- the 18th channel 18 are stacked successively and provided with exactly the same magnetic circuits 12 and windings 22 for recording head leakage magnetic flux detection with the magnetic circuits 10 and windings 22. Winding start terminals 21 of the windings 20 for the respective channels are connected to plus input terminals 5 of amplifiers 4 and the other-side terminals are connected to minus input terminals. The winding end terminals 23 of the windings 22 of the magnetic circuits 12 are connected to the plus input terminals of the amplifiers 4 and the other-side terminals are connected to the minus input terminals to obtain recording head leakage magnetic flux detection outputs 7 with the negative phase while amplifying the amplitude; and those outputs are inputted to adders 9 together with the outputs 6 of the amplifiers 4. |
