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11. 发明专利

JPS5187915A 失效
公开(公告)号：JPS5187915A
公开(公告)日：1976-07-31
申请号：JP1253475
申请日：1975-01-31
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： ETO YOSHIZUMI , MATSUI ITSUSEI , ISHIBASHI SHIZUKA
IPC分类号： H04L27/22 , H04L27/00 , H04N9/65

12. 发明专利

JPH027678A CONTOUR COMPENSATION CIRCUIT 失效
公开(公告)号：JPH027678A
公开(公告)日：1990-01-11
申请号：JP15664088
申请日：1988-06-27
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： MIMURA ITARU , AKIYAMA TOSHIYUKI , OZAWA NAOKI , ETO YOSHIZUMI , OOKA MASAHARU , TAKAHASHI KENJI
IPC分类号： H04N5/225 , H04N5/243
摘要： PURPOSE:To obtain a uniform high resolution characteristic by providing a contour compensation characteristic decision circuit varying the compensation characteristic depending on a position on the screen or a lens parameter and a variable compensation circuit applying resolution compensation calculation to a video signal input by the output of the said decision circuit. CONSTITUTION:The title circuit consists of the contour compensation characteristic decision circuit 1 and the compensation characteristic variable contour compensation circuit 2. The contour compensation characteristic decision circuit 1 obtains an input of screen position information and lens parameter information to decide compensation and to output a compensation data. The variable compensation circuit applies compensation calculation with respect to a video signal input according to the output command to obtain a video signal output with high resolution. Then the compensation characteristic is adjusted so as to make the resolution characteristic varied depending on the lens parameter and the position of the screen high uniformly. Thus, a television signal having uniformly high resolution is always obtained.

13. 发明专利

JPS62246175A SCRAMBLING CIRCUIT 失效
公开(公告)号：JPS62246175A
公开(公告)日：1987-10-27
申请号：JP8802386
申请日：1986-04-18
申请人： HITACHI ELECTRONICS , HITACHI LTD
发明人： OKIGUCHI KOTARO , UMEMOTO MASUO , ETO YOSHIZUMI
IPC分类号： G11B20/12
摘要： PURPOSE:To easily monitor data even if blocks are transposed, by operating random numbers different by blocks in parity parts and detecting the malfunction of a time base corrector with detection omission probability 1/2n because random numbers of different blocks are applied to error detection parity and operating the same random numbers for individual block in data parts. CONSTITUTION:If a control signal phi1 is loaded for every error detection block, the signal phi1 is applied to a counter 18, and the loaded address is applied to a ROM 19 and a signal is obtained where random numbers different by blocks are operated in only parity parts by a control signal phi2 and the same random numbers for individual blocks are operated in the other parts. Consequently, even if a time base skip signal for variable speed reproducing or the like is inputted, error detection is possible because random numbers corresponding to a prescribed address are applied again in the skip position. Even if the time base is transposed in block units, data parts are correctly restored because random numbers for data parts are equal in individual blocks.

14. 发明专利

JPS62192075A AUTOMATIC EQUALIZING METHOD AND DEVICE IN DIGITAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS62192075A
公开(公告)日：1987-08-22
申请号：JP3279386
申请日：1986-02-19
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： UMEMOTO MASUO , ETO YOSHIZUMI , TAKESHITA KAZUYUKI
IPC分类号： G11B20/10 , H04N5/92
摘要： PURPOSE:To automatically obtain an optimum characteristic with good accuracy by changing the characteristic of a variable equalizer so that the number of an output signal to pass through the vicinity of the center of the eye pattern of the output signal of the variable equalizer can be minimized. CONSTITUTION:The first variable equalizer 100 equalizes the reproducing signal of a recorded digital signal, outputs it to the circuit at the rear step, and the second variable equalizer 101 also has the same characteristic as the equalizer 100. The first means 102 counts the number of the output signal to pass through in a prescribed time in a prescribed scope from the central value in the identifying point of the eye pattern of the reproducing signal by the equalizer 101. The second means 103 changes the characteristic of the equalizer 101 periodically for a prescribed time, detects the characteristic when the counting value of the means 102 comes to be minimum and sets the characteristic of the equalizer 100 by matching with the characteristic.

15. 发明专利

JPS62188411A GAIN CONTROL CIRCUIT 失效
公开(公告)号：JPS62188411A
公开(公告)日：1987-08-18
申请号：JP2882786
申请日：1986-02-14
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： SAWAMURA HIDEHIKO , TAKESHITA KAZUYUKI , KATAYAMA HITOSHI , ETO YOSHIZUMI , UMEMOTO MASUO
IPC分类号： H04N5/14 , H03G3/12
摘要： PURPOSE:To control the gain without changing an emitter bias current by causing a constant current to flow dividedly to a current path including a variable resistive element and the other current path by means of a differential circuit and connecting two kinds of current paths to the emitter. CONSTITUTION:A common emitter amplifier circuit consists of a transistor (TR) 1, a variable resistive element 5, and a resistor 7. The DC bias component in the emitter current of the TR 1 is divided differentially by TRs 2, 3 and the emitter current is decided by a TR 4. The input signal is amplified by the TR 1 and the signal component is blocked by an inductance 6 at the emitter side of the TR 1, then the gain depends on a ratio of a collector resistor 7 to an AC resistance of the variable resistor element 5. The DC bias current flowing to the TR 1 being the sum of currents flowing to the TRs 2, 3 is set by resistors 12-14 of the TR 4 by changing a DC bias current flowing to the variable resistive element 5 by means of the control voltage.

16. 发明专利

JPS61271625A DIGITAL DUBBING METHOD 失效
公开(公告)号：JPS61271625A
公开(公告)日：1986-12-01
申请号：JP11201785
申请日：1985-05-27
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： UMEMOTO MASUO , ETO YOSHIZUMI , MIYAZAKI SHINICHI , KANEDA HIDEHIRO , KATAYAMA HITOSHI , DOUGAWA YUUICHI
IPC分类号： G11B20/10 , G11B5/86 , H04N9/804 , H04N9/808
摘要： PURPOSE:To decrease generation of an error or the like due to transmission distortion by using a digital signal before high speed conversion as a dubbing signal at dubbing so as to attain low speed transfer of data. CONSTITUTION:The deteriorated frequency of a signal from a magnetic tape by a magnetic tape head system is compensated by a preamplifier and equalizing circuit 7 at each channel and the error generated by the magnetic tape head system is corrected by an error correction circuit 8. After the signal after the error correction is subjected to low speed conversion as the dubbing signal and distributed to each channel, the signal is inserted via a switch 4. The dubbing signal is a data having the lowest transfer speed before high speed conversion 10 and the occurrence of a problem in data transmission is decreased with respect to the connection with other digital VTR.

17. 发明专利

JPS511021A RANRENGUSUFUGONO FUKUGOSOCHI 失效
公开(公告)号：JPS511021A
公开(公告)日：1976-01-07
申请号：JP7129874
申请日：1974-06-24
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： ETO YOSHIZUMI , SUIHAZU AKIHIKO , HIRANO YASUHIRO
IPC分类号： H04N1/40 , H04N1/00

18. 发明专利

JPH0410777A CONTROL DEVICE FOR DEPTH OF FILED OF IMAGE PICKUP DEVICE 失效
公开(公告)号：JPH0410777A
公开(公告)日：1992-01-14
申请号：JP11006190
申请日：1990-04-27
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： MIMURA ITARU , TAKAHASHI KENJI , AKIYAMA TOSHIYUKI , ETO YOSHIZUMI , OZAWA NAOKI , MATSUMOTO TAKAHIRO
IPC分类号： G02B7/28 , H04N5/225 , H04N5/232 , H04N5/262 , H04N5/265
摘要： PURPOSE:To optionally control the depth of a field without being influenced by the iris of a lens by providing the control device with a means for changing a focal position and a means for synthesizing an image signal and synthesizing a new image signal from image signals having respectively different focal positions. CONSTITUTION:The control device is provided with the means for obtaining two images 1, 2 having respectively different focal positions and the means for synthesizing an image signal having an optional depth of a field from the images 1, 2 having respectively different focal positions. In the case of photographing a person, the image 1 having the highest focus on the person and the image 2 having the highest focus on a background are obtained. The means for synthesizing an image signal synthesizes one image 3 by selectively using only the image signal parts having the highest focuses from these two image signals. Consequently, the highest focus image for the person can be obtained, the image with the required depth of field for the background image can also be obtained and a video signal with high resolution can be obtained as whole.

19. 发明专利

JPS63160050A DIGITAL MAGNETIC PICTURE RECORDING DEVICE 失效
公开(公告)号：JPS63160050A
公开(公告)日：1988-07-02
申请号：JP30647786
申请日：1986-12-24
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： UMEMOTO MASUO , ETO YOSHIZUMI , SATO AKIRA , KANEKO AKIRA , OWADA NOBUYOSHI
IPC分类号： H04N5/783 , G11B15/473
摘要： PURPOSE:To improve the picture quality at the vari-speed drive by controlling number of revolutions of the drum in response to two sets of period information of an output clock of a clock extraction circuit and a capstan tack signal. CONSTITUTION:Switches 3-1-3-3 are thrown to the position V at the vari-speed drive. A tack signal from a capstan is detected by a detector 8, passes through an LPF 9, is converted into a digital signal by an A/D converter 10, converted into conversion ROM 11, restored into an analog signal by an adder and D/A converter 12 and inputted to a frequency control circuit 4. The peripheral speed of the drum is controlled in response to the tape running speed by the ROM 11. It is difficult to match the peripheral speed of the drum with high accuracy by the loop only. Thus, an output of the clock extraction circuit 13 is inputted to an LPF 14, the output is converted into a digital signal by an A/D converter 15, a coefficient is given by a coefficient circuit 16 and inputted to the circuit 4 as an analog signal by the converter 12. Thus the recovered clock is always obtained even at the vari-speed drive.

20. 发明专利

JPS62175910A VIDEO TAPE RECORDER 失效
公开(公告)号：JPS62175910A
公开(公告)日：1987-08-01
申请号：JP26765786
申请日：1986-11-12
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： ETO YOSHIZUMI , KAYANO TATSUO
IPC分类号： G11B5/09 , G11B5/02 , H04N5/782 , H04N5/7826 , H04N5/92
摘要： PURPOSE:To record and reproduce an encoded signal of a television signal without deteriorating a picture quality, by dividing a code of an encoded television signal, allocating this divided code to plural pieces of rotary heads having each different azimuth angle, and executing the recording and reproduction. CONSTITUTION:Heads 4-7 are installed to the tip of an orthogonal supporting base, and when it is considered that these heads 4-7 rotate at a speed of once per 1 frame time in the direction as indicated with an arrow, for instance, the heads 4, 6, the head 5, and the head 7 record and reproduce the upper bit of a television signal of the first and the second fields, the lower bit of the first half of the second field from the latter half of the first field, and the lower bit of the first half of the first field from the latter half of the second field, respectively. Also, the heads 5, 7, and the heads 4, 6 are inclined by +theta, and -theta, respectively, against the rotary plane. As for theta, 5-10 deg. are suitable. At the time of reproduction, even when recording loci T4-T7 cannot be followed correctly, since the azimuth angle is different between adjacent loci, a crosstalk from the adjacent locus is scarcely generated due to an azimuth loss.

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