公开(公告)号：AU4124196A

公开(公告)日：1996-07-03

申请号：AU4124196

申请日：1995-12-12

Applicant: SONY CORP

Inventor： SHIMPUKU YOSHIHIDE ,  NAKAGAWA TOSHIYUKI

IPC: G06T9/00 ,  G11B20/14 ,  H03M5/14 ,  H03M7/14

公开(公告)号：AU666166B2

公开(公告)日：1996-02-01

申请号：AU3408393

申请日：1993-03-09

Applicant: SONY CORP

Inventor： INO HIROYUKI ,  SHIMPUKU YOSHIHIDE ,  CHAKI YASUYUKI ,  NAKAGAWA TOSHIYUKI

IPC: G11B20/14 ,  H03M5/14 ,  H03M7/20 ,  H03M7/46 ,  G11B20/10

Abstract: A modulating method and apparatus and a demodulating method and apparatus in which a variable length code (d, k;m, n;r) which can provide a greater minimum reversal distance to allow recording of a higher density than ever is provided. According to the modulating method and apparatus, digital data of a basic data length of m bits is modulated into a variable length code (d, k;m, n;r) of a basic code length of n bits, and where the distance between adjacent ones of the digital data is represented by T, the minimum reversal distance (Tmin) of the variable length code is equal to or greater than 2.0T and the minimum length of a run of a same symbol is equal to or greater than 4. The demodulating apparatus demodulates the digital data back into the variable length code and comprises storage means (23) for storing therein a plurality of tables for converting the digital data into the variable length code, discriminating means (21) for discriminating the binding length of the digital data, and selecting means (22) for selecting one of the tables in accordance with a result of discrimination of the discriminating means(21).

公开(公告)号：MY100775A

公开(公告)日：1991-02-14

申请号：MYPI19872604

申请日：1987-09-30

Applicant: SONY CORP

Inventor： SHIMPUKU YOSHIHIDE

IPC: G11B5/52 ,  G11B5/09 ,  G11B5/48 ,  G11B5/53 ,  G11B5/56

Abstract: IN A MAGNETIC RECORDING DEVICE, DIGITAL DATA IS RECORDED WITH HIGHER DENSITY IN SUCH A MANNER THAT PLURAL RECORDING TRACKS (5) ARE SEQUENTIALLY FORMED ON A MAGNETIC RECORDING MEDIUM (4). ANY TWO ADJOINING TRACKS (5A, 5B) ARE FORMED BY SEPARATE MAGNETIC HEADS (3A, 3B) WHOSE AZIMUTH ANGLES ARE EQUAL TO +THETA, -THETA, WITH THE ABSOLUTE VALUE OF THE ANGLE BEING SELECTED TO SATISFY THE RELATIONSHIP16?