| 摘要 |
<p>A helical scan magnetic recording/reproducing device having an MR reproducing magnetic head wherein data to be recorded on a magnetic tape is converted through a modulation circuit (42) into a DC-free code sequence. The device comprises a high-pass filter for attenuating the low frequency components of a reproduced signal picked up by an MR head (6), and a circuit (58) for demodulating the reproduced signal from the high-pass filter to produce data before being converted into th DC-free code sequence. The low band noise (thermal asperity) produced due to the contact of the magnetic tape with the MR head is removed and a noise-suppressed reproduction output can be obtained. A rotary transformer (25) mounted on a rotary drum is employed as the high-pass filter.</p> |
