专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPS63251923A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING METHOD USING SAID MEDIUM 失效
公开(公告)号：JPS63251923A
公开(公告)日：1988-10-19
申请号：JP8467687
申请日：1987-04-08
申请人： FUJI PHOTO FILM CO LTD , JAPAN BROADCASTING CORP
发明人： KITAMOTO TATSUJI , SASAZAWA KOJI , MIZUGUCHI HODAKA , SHIBATANI HIROMICHI
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , G11B5/00 , G11B5/02 , G11B5/716 , G11B5/78 , H04N5/782
摘要： PURPOSE:To decrease spurious components and to improve the signal to noise ratio of color signals by using a magnetic recording medium formed by constituting magnetic materials having different reproduction output characteristics to temp. into two layers. CONSTITUTION:A magnetic recording layer contg. a barium ferrite magnetic material in the upper layer and the magnetic recording layer contg. a magnetic material consisting of chromium dioxide or Co-modified iron oxide alone or mixture composed thereof in the lower layer are provided on a base. The magnetic material to be used for the lower layer is preferably Co-FeOx and CrO2 which are reverse in the characteristic of a change in coercive force with temp. from Ba ferrite and further, CrO2 having a large difference in a change in magnetization with temp. Since the magnetic recording layer is constituted in the double layers in such a manner, recording of an F1 component in the lower layer and an f2 component in the upper layer is possible if the f1 component of the low frequency range is recorded by a 1st head and in succession the f2 component of the higher frequency range is recorded by a 2nd head. Since the f1 component is decreased by medium heating at the time of reproduction, the spurious components to be incorporated into the f2 component decrease as well. The recording level of the f2 component is thereby increased further and the SN of the reproduced f1 component is improved.

2. 发明专利

JPH063942B2 失效
公开(公告)号：JPH063942B2
公开(公告)日：1994-01-12
申请号：JP2826290
申请日：1990-02-09
申请人： JAPAN BROADCASTING CORP
发明人： UEHARA TOSHIHIRO , MIZUGUCHI HODAKA , OOBA YOSHINOBU
IPC分类号： H03M7/14 , H04L25/49

3. 发明专利

JPS63182985A METHOD AND DEVICE FOR TELEVISION SIGNAL BAND COMPRESSION/ RESTORATION, AND TELEVISION SIGNAL BAND COMPRESSION/ RESTORATION AND RECORDING/REPRODUCTION 失效
公开(公告)号：JPS63182985A
公开(公告)日：1988-07-28
申请号：JP1475187
申请日：1987-01-23
申请人： JAPAN BROADCASTING CORP
发明人： MIZUGUCHI HODAKA
IPC分类号： H04N5/92 , H04N19/423 , H04N19/50 , H04N19/59 , H04N19/85
摘要： PURPOSE:To accurately and simply decide the magnitude of an inter-frame correlation and to decrease the number of picture element samples in accordance with a prescribed rule almost without any deterioration in the quality of a picture by constituting the titled method and devices so that one piece among sample values is transmitted in every frame. CONSTITUTION:A first means takes out the first through fourth sample values of such four picture elements as neighboring with each other in the horizontal and the vertical directions during the one-field period of a television signal; a fifth sample value is obtained by averaging the first and the second values among said four sample values, and among the said fifth, third, and fourth sample values, two are summed up and the difference between thus obtained sum and the remaining one sample value is calculated. A second means takes out sixth through eighth sample values; and among these three sample values, the sixth and the seventh values are taken out during the first frame period of the television signal. During the second frame period of the television signal, the sixth and the eighth sample values are taken out. Thus taken out signals are transmitted (recorded), and received (reproduced).

4. 发明专利

JPH03234146A DIGITAL MODULATION METHOD 失效
公开(公告)号：JPH03234146A
公开(公告)日：1991-10-18
申请号：JP2826290
申请日：1990-02-09
申请人： JAPAN BROADCASTING CORP
发明人： UEHARA TOSHIHIRO , MIZUGUCHI HODAKA , OBA YOSHINOBU
IPC分类号： H03M7/14 , H04L25/49
摘要： PURPOSE:To attain high density recording in the magnetic recording and also azimuth recording and overwrite recording by selecting consecutive number of same bits of a 14-bit modulation code to be 2 or over and less than 7. CONSTITUTION:Up to first 6 bits in 2 sets of digital codes of 14-bit structure are selected in terms of consecutive number of same bits to be less than 5 and bits from a 7th bit to a 13th bit are detected to be 2 or over and less than 7 in terms of the consecutive number of same bits. Moreover, the consecutive number of same bits is selected to be less than 6 up to the 7th bits from the least significant bit. Two or four digital modulation codes as above are used as one set and a different 8-bit digital data is related to each set of the digital codes. Then a modulation code in which the absolute value of Digital Sum Value is a definite value is selected in a series of digital modulation code strings obtained by outputting a selected digital modulation code. Thus, the DC component of a modulation signal is eliminated efficiently in a short time.

5. 发明专利

JPH02270422A DIGITAL MODULATION SYSTEM 失效
公开(公告)号：JPH02270422A
公开(公告)日：1990-11-05
申请号：JP9053789
申请日：1989-04-12
申请人： JAPAN BROADCASTING CORP
发明人： UEHARA TOSHIHIRO , MIZUGUCHI HODAKA , OBA YOSHINOBU
IPC分类号： G11B20/14 , H03M7/14
摘要： PURPOSE:To attain azimuth recording and overwrite recording at higher density recording and magnetic recording by converting an 8-bit digital data into a 14-bit digital modulation code and taking consecutive bits '0's or '1's of the modulation code as 2-7 bits. CONSTITUTION:A coder 2 converts an 8-bit digital data 1 into a 14-bit digital modulation code. An ending decision section 3 outputs the ending of final 5-bit of a 14-bit modulation code and the code is converted into a 4-bit code based on Table 8. A CDS calculation section 5 outputs. a CDS of modulation code and the code is converted into 3-bit code based on Table 7. A DSV calculation section 4 adds the CDS of the modulation code and a DSV (digital sum value) at the end of the just preceding modulation code to obtain a new DSV and the result is converted into a 3-bit code according to the Table 7. A parallel serial conversion section 8 applies parallel-serial conversion to the 14-bit modulation code synchronously with a clock signal 9 and a recording section 10 records the serial modulation signal onto a recording medium.

6. 发明专利

JPH03273574A DIGITAL SIGNAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH03273574A
公开(公告)日：1991-12-04
申请号：JP7380590
申请日：1990-03-23
申请人： MATSUSHITA ELECTRIC IND CO LTD , JAPAN BROADCASTING CORP
发明人： FUJIWARA MIKIO , TOGASHI SHIGEKAZU , KAWAKAMI YASUNORI , UEHARA TOSHIHIRO , MIZUGUCHI HODAKA
IPC分类号： G11B20/14 , G11B20/10
摘要： PURPOSE:To make the actions of the circuits of a clock reproducing PLL and an automatic equalizing controller stable in a run-up reproducing period by providing a run-up code generator which generates an optimum run-up pattern for converging the clock reproducing PLL and the automatic equalizing controller in a short time. CONSTITUTION:This device is provided with the run-up code generating means 3 for generating the optimum run-up pattern to the clock reproducing PLL 16 and the automatic equalizing controller 12 by combining at least two or more digital value systems having different inversion interval. Then, the run-up pattern having spectrum in the band of comparing a signal in the low band and the high band of the controller 12 is generated and used without affecting the pull-in time of the PLL 16. Thus, the actions of the circuits of the clock reproducing PLL 16 and the automatic equalizing controller 12 are made stable in the run-up period.

7. 发明专利

JPH01130680A TELEVISION SIGNAL RECORDER 失效
公开(公告)号：JPH01130680A
公开(公告)日：1989-05-23
申请号：JP28829187
申请日：1987-11-17
申请人： JAPAN BROADCASTING CORP
发明人： MIZUGUCHI HODAKA
IPC分类号： H04N5/92
摘要： PURPOSE:To improve a picture quality by defining (2 -1) vertically arranged picture elements to be a unit and recording a difference between the sum of tile arbitrary 2 of the sampled values of the picture elements and the sum of residual{2 -1} as a new sampled value. CONSTITUTION:A conversion matrix circuit 9 and a switching circuit 16 are provided, the (2 -1)vertically adjacent picture elements are defined to be the unit, the sum of the 2 arbitrary sampled values of the sampled values of the (2 -1) picture elements and the sum of the residual {a 2 -1} sampled values are taken to take the difference between the two sampled values as the new sampled value. The recorded sampled value can be recovered to an original sampled value according to the addition average of 2 of the (2 -1) sampled values at the time of a reproduction and according to this addition average, an influence such as a noise, a spurious drop out generated in a recording system can be reduced. Thereby, the deterioration of S/N due to a dubbing can be eliminated remedied.

8. 发明专利

JPH03149923A ERROR CORRECTION METHOD 失效
公开(公告)号：JPH03149923A
公开(公告)日：1991-06-26
申请号：JP28789089
申请日：1989-11-07
申请人： JAPAN BROADCASTING CORP
发明人： UEHARA TOSHIHIRO , MIZUGUCHI HODAKA , OBA YOSHINOBU
IPC分类号： H03M13/00 , H04L1/00
摘要： PURPOSE:To improve the error correction capability by setting a missing flag to a symbol representing it that a reproduced or received n-bit modulation code is not included in the pattern of defined modulation code, and using the missing flag for the error correction implemented in the symbol unit. CONSTITUTION:Assuming the number of missing symbols in an inner code block counted by a missing symbol count circuit 10 as (p), and the number of added parity symbols of an inner code as (t), then in the case of t-q

9. 发明专利

JPH0370318A CONSTITUTION METHOD AND DECODING METHOD FOR ERROR CORRECTION CODE 失效
公开(公告)号：JPH0370318A
公开(公告)日：1991-03-26
申请号：JP20574589
申请日：1989-08-10
申请人： JAPAN BROADCASTING CORP
发明人： KUGE TETSUO , MIZUGUCHI HODAKA
IPC分类号： H03M13/00
摘要： PURPOSE:To improve the correction capability by adopting the constitution for an error correction code such that each information symbol to be sent is protected by 4 linear code through the combination of product codes of 2 kinds of 2-dimensional structure. CONSTITUTION:At first a 2-dimensional product code is formed with respect to a set I of information symbols and the 2-dimensional product code CXY is formed as a matrix C and a matrix D is formed by rearranging all the elements of the matrix C with a rule, the matrix D is used as information to be sent newly and a 2-dimensional product code E is formed. The matrix E has a form adding a parity bit at the outside of the matrix D. In the 4 axis cross code, 4 linear codes are in crossing in each information symbol to be sent and the 4 crossing codes are not crossed other than in the information symbol. Thus, high correction capability is enhanced.

10. 发明专利

JPH02260823A DECODING SYSTEM FOR ERROR CORRECTION CODE 失效
公开(公告)号：JPH02260823A
公开(公告)日：1990-10-23
申请号：JP7845989
申请日：1989-03-31
申请人： JAPAN BROADCASTING CORP
发明人： KUGE TETSUO , MIZUGUCHI HODAKA
IPC分类号： H03M13/00
摘要： PURPOSE:To use the correction capability of a code in each axis direction at the maximum, to suppress the occurrence of mis-correction lower and to attain high correction capability as a whole by taking a code constituting to be a 3-dimensional rectangular prism as an object and discriminating generally the 3 ways of decoding results of each direction. CONSTITUTION:A single code in directions of axes X, Y, Z forming the 3-dimensional code of a rectangular prism is corrected and when an error which can not be corrected remains, some points (CP) where 3 codes whose error is detected intersect with each other exist. Then error is corrected to each CP and when the code is decided correct by a prescribed criterion, the error in the position of the CP is corrected. Then the CP is deleted (it is not regarded as the CP in the succeeding processing) and the other CPs in existence on the code are deleted, as well. That is, the error is being corrected one after another by repeating the correction and deleting over the entire rectangular prism for many number of times. Thus, while using the correction capability of the code in each axial direction up to the maximum and preventing the occurrence of mis-correction, high correction capability is realized.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式