Kabushiki Kaisha Toshiba

Yasuyoshi Nishikawa

Hisashi Yamada

Katsumi Fukuchi

Masaaki Kato

Masahiro Nakashika

Shigeo Kizu

Fumihiko Murakami

Keisuke Ogi

Toshinobu Murakami

Hidenari Ikeda

A digital magnetic recording/reproducing apparatus comprising a unit for recording high-definition information including video information and audio information, which is based on a first high-definition television scheme, on a recording medium in accordance with a second high-definition television scheme, the first high-definition television scheme having a first data format of a first amount of information smaller than a second amount of information of a second data format of the second high-definition television scheme, the recording unit including a circuit for allocating a recording area corresponding to a difference between the first amount of information and the second amount of information as a free recording area on which any information is selectively recorded, to match the first amount of information with the second amount of information.

Digital magnetic recording/reproducing apparatus and cassette digital

A magnetic recording/reproducing apparatus includes a write head for recording a signal on a magnetic recording medium, a recording amplifier for supplying a recording current corresponding to the signal to the write head, a read head for reproducing the signal recorded on the magnetic recording medium, a reproducing amplifier for generating a reproduced current corresponding to the signal, an equalizer for correcting a waveform of a reproduced signal reproduced by the read head, a distortion detector for detecting signal distortion reproduced by the read head, thereby obtaining a distortion evaluation value, and a recording current adjusting section for adjusting a magnitude of the recording current in a direction to decrease the distortion (i.e., in a direction to decrease the recording current) on the basis of a detection output obtained by the distortion detector. An optimum recording current is always supplied to the write head in accordance with the degree of wear of the write head. The degree of wear of the head is detected upon request, and head replacement is prompted.

Magnetic recording/reproducing apparatus for automatically adjusting a

A magnetic recording/reproducing apparatus includes a write head for recording a signal on a magnetic recording medium, a recording amplifier for supplying a recording current corresponding to the signal to the write head, a read head for reproducing the signal recorded on the magnetic recording medium, a reproducing amplifier for generating a reproduced current corresponding to the signal, an equalizer for correcting a waveform of a reproduced signal reproduced by the read head, a distortion detector for detecting distortion of signal reproduced by the read head, thereby obtaining a distortion evaluation value, and a recording current adjusting section for adjusting a magnitude of the recording current in a direction to decrease the distortion (i.e., in a direction to decrease the recording current) on the basis of a detection output obtained by the distortion detector. An optimum recording current is always supplied to the write head in accordance with the degree of wear of the write head. The degree of wear of the head is detected upon request, and head replacement is prompted.

Magnetic recording/reproducing apparatus for decreasing an error rate in

A digital phase locked loop circuit samples the reproduced analog signal of a digital signal at a sampling frequency larger than the bit rate of the digital signal, and arithmetically operates, by using data at a plurality of successive sampling points, an average phase of the reproduced signal in the range from a point where the reproduced signal crosses a reference level to a predetermined sampling point, and makes the phase locked loop control of the reproduced signal by using the operated average phase.

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Kawasaki, Japan

Yasuyoshi Nishikawa