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21. 发明专利

JPH01260930A DECODING METHOD FOR ERROR CORRECTION CODE 失效
公开(公告)号：JPH01260930A
公开(公告)日：1989-10-18
申请号：JP8734288
申请日：1988-04-11
申请人： HITACHI LTD
发明人： KANEDA HIDEHIRO
IPC分类号： H03M13/00
摘要： PURPOSE:To simplify the error detection calculation of

22. 发明专利

JPS6364603A DIGITAL SIGNAL REPRODUCING DEVICE 失效
公开(公告)号：JPS6364603A
公开(公告)日：1988-03-23
申请号：JP20786686
申请日：1986-09-05
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , KANEDA HIDEHIRO , ETO YOSHIZUMI , SAWAMURA HIDEHIKO , KATAYAMA HITOSHI
IPC分类号： G11B5/09 , G11B20/18 , H04N5/92
摘要： PURPOSE:To observe or watch the state of error of each magnetic head by totaling information indicating error of code of reproduced digital signals for each head of plural magnetic heads. CONSTITUTION:Television signals are distributed from an input terminal 1-1 to three channels in a distributor circuit 1-3 through an A/ converter 1-2, and error detection codes are added in an ECC adder circuit 1-4 and recorded by magnetic heads A-D. Record pattern of a magnetic tape 1-7 is reproduced by magnetic heads A-D, and decoded to digital signals by an equivalent circuit 1-9 through a pre-amplifier 1-8. The signals are inputted to a TBC1-10, and the variation of time axis is corrected, and the code errors are detected by an ECC1-11, and the errors that can be corrected are corrected. The corrected signals are put together by an integrating circuit 1-12 and returned to TV signals by a D/A converter 1-13. On the other hand, the output signals of the ECC1-11 are inputted to a counter 2-2 through a switcher 2-1, and the error pulses are counted and displayed in a display 2-3.

23. 发明专利

JPS59186114A Magnetic head 失效
标题翻译：磁头
公开(公告)号：JPS59186114A
公开(公告)日：1984-10-22
申请号：JP6084183
申请日：1983-04-08
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： KOUNOUE AKIHIKO , MITA SEIICHI , IZUMIDA MORIJI , KANEDA HIDEHIRO , SHIONO HIROSHI , ROKUTA MORIHITO , TAKAGI HITOSHI
IPC分类号： G11B5/187
CPC分类号： G11B5/1871
摘要： PURPOSE:To obtain a head of a long service life by providing plural grooves in parallel with a recording track to a sliding face of the magnetic head so as to decrease the spacing between the head and a tape. CONSTITUTION:To the sliding face of the magnetic head, >=2 grooves in parallel with the recording track are provided. Since the air placed between the tape and the sliding face of the head is moved as shown in arrows 4-6 and most of the air enters the grooves or passes through the head side face, the spacing between the head and tape is decreased. Although the depth of gap of the head is decreased because the sliding face is worn as being operated long, the effect of the grooves is kept until the service life of the head ends by making the depth of the grooves deeper than the depth of the gap.
摘要翻译：目的：为了通过在磁头的滑动面上设置与记录轨道平行的多个凹槽来获得长使用寿命的头部，以减小磁头和磁带之间的间隔。构成：提供磁头的滑动面，与记录轨道平行的> = 2个凹槽。由于放置在磁带和头部的滑动面之间的空气如箭头4-6所示移动，大部分空气进入凹槽或通过磁头侧面，磁头和磁带之间的间距减小。虽然由于滑动面的磨损长时间而使头部的间隙深度减小，但是通过使凹槽的深度比间隙的深度更深地保持凹槽的效果直到头部的使用寿命终止。

24. 发明专利

JPH01228285A ERROR CORRECTING METHOD FOR DIGITAL TELEVISION SIGNAL 失效
公开(公告)号：JPH01228285A
公开(公告)日：1989-09-12
申请号：JP5256088
申请日：1988-03-08
申请人： HITACHI LTD
发明人： KANEDA HIDEHIRO , NAKANO KENJI
IPC分类号： H04N5/92 , G11B20/18 , H04N5/93
摘要： PURPOSE:To simply obtain an optimum error correcting direction by deciding the error correcting direction from two sample data opposed by disposing error sample data therebetween and forming corrected sample data. CONSTITUTION:The sample data nS-1, nS1 from terminals 2, 4 are supplied to an absolute value arithmetic 10 to operate a horizontal level difference H2. Similarly, in a circuit 11, a vertical level difference V2 is operated, in a circuit 12, a leftward and upward diagonal level difference D, and in a circuit 13, a rightward and upward diagonal level difference D are respectively operated. Subtraction circuits 14-16 select a minimum one from the H2, the V2, the D, and the D. When there is the error in the sample data, a switch 26 selects the sample data nS0 from an average value arithmetic circuit 17 as the corrected sample data.

25. 发明专利

JPS59186106A Digital signal recording circuit 失效
标题翻译：数字信号记录电路
公开(公告)号：JPS59186106A
公开(公告)日：1984-10-22
申请号：JP6084283
申请日：1983-04-08
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： IZUMIDA MORIJI , MITA SEIICHI , KOUNOUE AKIHIKO , TAKAGI HITOSHI , ROKUTA MORIHITO , SHIONO HIROSHI , KANEDA HIDEHIRO
IPC分类号： G11B20/14 , G11B20/10
CPC分类号： G11B20/10203
摘要： PURPOSE:To suppress an average DC component without prolonging consecution of 0 or 1 by adding a redundancy bit to decrease the consecution of 0 or 1 and a redundancy bit to eliminate a DC component so as to decrease the rate of rise of a data rate. CONSTITUTION:An NRZ signal is converted into an NRZI signal so as to prevent the expansion of error due to blocking. The 1st modulation circuit 20 adds the 1st redundancy bit and controls the block so that 1s share over a half of the block. The 2nd modulation circuit 30 adds the 2nd redundancy bit and controls the block so that the accumulative value of weight closes to 0. The NRZI data is a code where preceding and succeeding bits are related to each other and two degrees of freedom are given by inserting two redundancy bits between blocks. Thus, the DC component is eliminated by using comparatively less number of redundancy bits and further, the consecution of 1s and 0s is decreased.
摘要翻译：目的：通过添加冗余位来减少0或1的连续性来抑制平均直流分量，而不延长连续使用0或1，并且冗余位消除直流分量，以降低数据速率的上升率。构成：NRZ信号被转换成NRZI信号，以防止由于阻塞造成的误差扩大。第一调制电路20添加第一冗余位并控制块，使得1s共享该块的一半以上。第二调制电路30加上第二冗余位，并控制块，使得重量的累计值接近0. NRZI数据是前后位彼此相关的代码，并且通过插入来给出两个自由度块之间的两个冗余位。因此，通过使用相对较少数量的冗余位来消除DC分量，并且还减少了1s和0s的连续性。

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