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Magnetic recording/reproducing apparatus with rotary drum with magnetoresistance head for transducing DC-free code signals
Magnetic recording/reproducing apparatus with rotary drum with magnetoresistance head for transducing DC-free code signals
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机译:具有带有磁阻头的转鼓的磁记录/再现设备,用于转换无直流电的代码信号
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摘要
A helical scan magnetic recording/reproducing apparatus incorporating an MR head to serve as a reproducing magnetic head is arranged to convert data which is recorded on a magnetic tape into data in the form of DC-free code trains. The magnetic recording/reproducing apparatus is provided with a high-pass filter for attenuating low-frequency components of a reproduced signal detected by the MR head. Moreover, a demodulating circuit is provided which demodulates data in a state before data is converted into the DC-free code trains from the reproduced signal, in which the low-frequency components have been attenuated by said high-pass filter. As a result, noise (thermal asperities) in a low-frequency region caused when the magnetic tape and the MR head are brought into contact with each other is removed so that a reproduced output free from excessive noise is obtained. The high-pass filter is, for example, a rotary transformer mounted on rotational drum.
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