Hitachi, Ltd.

Hitachi Video Engineering, Incorporated

Naozane Yoshida

Atsushi Saito

Takuya Mizokami

Takehiko Sekine

Hitoshi Abe

Nobuhiro Washiya

Tsutomu Takagi

Katsutoshi Tajima

If information is to be recorded on and reproduced from a recording medium in correspondence between a code train in the form of a run-length-limited code and the positions of the leading edge and the trailing edge data of a status transition pattern such as pits, recording domains, a sync signal is inserted at regular intervals in the information converted in the form of the run-length-limited code. The sync signal is constituted by a code train capable of deciding that the sync signal includes a code not existing in the conversion rule into a run-length-limited code during reproduction using a leading edge data or trailing edge data relative to the transition pattern.

Data recording/reproducing device

Information recording/reproducing device and method in which a

Information recording/reproducing device and method for

An apparatus for adding isopleths to image data includes an input device for sequentially inputting image data to be displayed on an image screen of a display device, a horizontal delay circuit for delaying the inputted data by one horizontal scanning period, a column comparator for comparing the inputted data, that is, a sample, with a delayed sample from the horizontal delay circuit to thereby generate a signal indicating a sample to be converted into isopleth data, a sample delay circuit for delaying the sample outputted from the horizontal delay circuit by one sampling period, a row comparator for comparing the sample outputted from the horizontal delay circuit with the sample outputted from the sample delay circuit to thereby generate a signal indicating a sample to be converted into isopleth data, and an isoplete data generator responsive to the output of the column and row comparators for replacing the indicated input sample by predetermined distinguishable data and for outputting the predetermined distinguishable data to the display device.

Isopleth generator for applying isopleths to digital picture data and

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Yokohama, Japan

Naozane Yoshida