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21. 发明专利

JPS58141089A RECORDING CIRCUIT FOR VIDEO SIGNAL AND SOUND SIGNAL 失效
公开(公告)号：JPS58141089A
公开(公告)日：1983-08-22
申请号：JP2270182
申请日：1982-02-17
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIBATA AKIRA
IPC分类号： G11B20/00 , G11B5/027 , H04N5/782 , H04N5/923 , H04N9/79 , H04N9/793 , H04N9/80 , H04N9/802 , H04N9/82 , H04N9/83 , H04N9/835
摘要： PURPOSE:To suppress disturbance to a sound signal while improving picture quality through the expansion of a video signal band, by providing a comb- shaped filter as a luminance signal processing circuit when recording the sound and video signals on the same track on frequency multiplex basis. CONSTITUTION:This invention employs a devised comb-shape filter 33. This comb-shaped filter 33 is inserted into the luminance signal processing circuit to extract only a luminance signal component in the band while suppressing a chroma signal. Therefore, the chroma component of the lower-side wave of a luminance FM signal is suppressed and the leakage of the video signal to the sound signal is reduced to reproduce a sound of good quality. Further, the insertion of the comb-shaped filter increase the characteristics of an L.P.F3 to about fc=3.3MHz to realize the reproduction of excellent picture quality. The widening of the band of the realizes the wide band of the luminance signal and increases the leakage of the chroma lower-side wave to the sound signal, thereby installing the comb-shaped filter effectively.

22. 发明专利

JPS5880107A PREEPHASIZING CIRCUIT OF VIDEO TAPE RECORDER 失效
公开(公告)号：JPS5880107A
公开(公告)日：1983-05-14
申请号：JP17567681
申请日：1981-11-04
申请人： HITACHI LTD
发明人： SHIBATA AKIRA , KOMATSU KEIICHI , MITSUHAYASHI SHIYUNSUKE , AZEYANAGI TOMOMITSU , KOJIMA NOBORU
IPC分类号： H04N5/922 , G11B20/02 , G11B20/06 , H04N5/923
摘要： PURPOSE:To obtain a preemphasizing circuit which has a reduced degree of waveform distortion and can compensate the produced waveform distortion through a simple deemphasizing circuit, by using an input terminal, a high-pass filter, an amplitude limiter, an adder, etc. CONSTITUTION:The high band frequency component is extracted out of a video signal A applied to an input terminal through a high-pass filter 12, and the amplitude 25 is limited by an amplitude limiter 13 for the output signals of the filter 12. The signal A is added with the output signal B of the limiter 13 through an adder 15. In such constitution of circuit, the preemphasized video signal C is restored to a waveform D close to an original waveform A through a deemphasizing circuit including a subtractor 16, an amplitude limiter 17 and a high-pass filter 18 for example. The waveform D is then delivered through an output terminal 7.

23. 发明专利

JPS5877388A HIGH DENSITY MAGNETIC RECORDER AND REPRODUCER 失效
公开(公告)号：JPS5877388A
公开(公告)日：1983-05-10
申请号：JP17567481
申请日：1981-11-04
申请人： HITACHI LTD
发明人： AZEYANAGI TOMOMITSU , KOJIMA NOBORU , KOMATSU KEIICHI , NAKAGAWA HIMIO , SHIBATA AKIRA
IPC分类号： H04N9/84
摘要： PURPOSE:To make the chrominance signal processing circuit of the NTSC and PAL system VTR common, by converting a PAL system chrominance signal into a low frequency band with a carrier signal shifting the phase by 45 deg. at every 1H. CONSTITUTION:A chrominance signal of a carrier frequency fsc from an input terminal 1 is inputted to a converter 12 via an ACC circuit 11, converted into a low frequency chrominance signal of a carrier frequency fLSC, picked up from a chrominance signal output terminal 7 at recording via an LPF 13 and a killer amplifier 14, and synthesized with a luminance signal at a recording amplifier for recording. Further, an output signal SN of a voltage controlled oscillator 18 is frequency-divided into the carrier frequency fLSC of the low frequency chrominance signal at a frequency division circuit 19 and connected to a phase selection circuit 20. The circuit 20 selects the phase of an input signal Sc of a converter 21 to shift the phase of the chrominance signal by 90 deg. per 1H for the NTSC system and by 45 deg. for the PAL system, and the output signal of the converter 21 is inputted to the converter 21 via a BPF 22.

24. 发明专利

JPS57138276A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS57138276A
公开(公告)日：1982-08-26
申请号：JP2300781
申请日：1981-02-20
申请人： HITACHI LTD
发明人： KOJIMA NOBORU , SHIBATA AKIRA , MIURA KUNIAKI , KOMATSU KEIICHI
IPC分类号： H04N5/93
摘要： PURPOSE:To compensate blur of contours and to increase the S/N ratio of a VTR by reversing the transfer characteristics of a line correlating circuit during reproduction with those of a detail emphasizing circuit in the vertical direction during recording. CONSTITUTION:A line correlating circuit during reproduction is provided with an 1-horizontal-line delay circuit 13 having a band wide enough to make even a video signal pass through it, a video limiter circuit 10, a subtracter 9, and an adder 14. After a video signal Vin from a terminal 12 is subtracted by the subtracter 9 from a video signal preceding it by one horizontal line, the small smplitude component of a signal passed through the circuit 10 is added to the difference to emphasize a vertical detail component. The correlating circuit during recording is constituted into a feedback type by using said 1-horizontal- line delay circuit 13, video limiter circuit 10, and subtracters 9 and 11. Then, the output VP of the VDE circuit is the same as the signal Vin and vertical contour correction by the VDE circuit and the improvement of an S/N ratio by the line correlating circuit are optimized to obtain a natural picture free of a vertical contour blur.

25. 发明专利

JP2001008212A IMAGE TRANSMISSION METHOD 失效
公开(公告)号：JP2001008212A
公开(公告)日：2001-01-12
申请号：JP17294199
申请日：1999-06-18
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KAMI HIROAKI , KURASHIGE TOMOYUKI , KINUGASA TOSHIRO , KOMATSU KEIICHI
IPC分类号： H04N19/50 , H04N19/12 , H04N19/136 , H04N19/156 , H04N19/164 , H04N19/503 , H04N19/587 , H04N19/59 , H04N7/32
摘要： PROBLEM TO BE SOLVED: To attain optimum picture transmission, in matching with a decoding capability of an MPEG decoding processing section. SOLUTION: A transmission terminal 2 receives a picture signal from a picture input device 1, encodes the picture signal into MPEG picture data, and transmits the data to a reception terminal 3 via a network 4. The reception terminal 3 decodes the MPEG picture data and gives the decoded data to a monitor 5. There is a reception terminal 3 that adds a copy picture to interleaved MPEG picture data resulting interleaving a B picture from the original MPEG picture data, to decode the data into picture signals having a correct frame interval and the other reception terminal 3 that can not correctly decode the interleaved MPEG picture data but can correctly decode the complete MPEG picture data only. Prior to the transmission of data to the reception terminal 3 that has made a transmission request, the transmission terminal 2 detects the decoding capability of the reception terminal 3 of the destination and transmits the interleaved MPEG picture data or the complete MPEG picture data, depending on the decoding capability to the terminal 3.

26. 发明专利

JPH0614225A CAMERA INCORPORATED TYPE MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0614225A
公开(公告)日：1994-01-21
申请号：JP16742792
申请日：1992-06-25
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , NUMA MASANORI , HARADA NORIAKI , MIZUNO MASAMI
IPC分类号： G11B33/00 , G11B33/06 , H04N5/225
摘要： PURPOSE:To reduce the pollution of a signal due to a voltage drop, and to stabilize the operation of a circuit by making the ground wiring length of an image pickup element unit the shortest by directly bringing the ground potential parts of both a power source part and the image pickup element unit arranged on a VTR circuit board into contact with each other. CONSTITUTION:A VTR mechanism part 60 is arranged at a left side, and a VTR board 30 is arranged at a right side so that the insertion port of a VTR cassette can be arranged at the left side in order to hold a video camera in a right hand. Therefore, a camera PC board 20 which frequently operates the transmission and reception of a signal with the board 30 is arranged at the right side of the camera, and an AF board 40 is arranged at the left side. It is necessary to arrange a power source 50 to be close to a CCD 11 whose signal level is the lowest, and to shorten the ground wiring between both of them. There is no space to mount the power source 50 at the board 10 on which the CCD 11 is mounted, and then the power source 50 is mounted on the board 30, and the shield case is brought into contact with the shield case of the CCD 11 on the board 10. And also, at least one of those shield cases is provided with elasticity, or equipped with a plate spring or the like. And also, an AV connector is provided on the board 30 so that a video signal from an outside can be received.

27. 发明专利

JPH0528951B2 失效
公开(公告)号：JPH0528951B2
公开(公告)日：1993-04-27
申请号：JP10925985
申请日：1985-05-23
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , AZEYANAGI TOMOMITSU , SHIBATA AKIRA
IPC分类号： H04N5/93 , H04N5/21 , H04N5/931

28. 发明专利

JPH0422079B2 失效
公开(公告)号：JPH0422079B2
公开(公告)日：1992-04-15
申请号：JP8140282
申请日：1982-05-17
申请人： HITACHI LTD
发明人： SHIBATA AKIRA , KOMATSU KEIICHI , AZEYANAGI TOMOMITSU , KOJIMA NOBORU
IPC分类号： H04N9/79 , H04N9/802 , H04N9/83 , H04N9/898

29. 发明专利

JPH0318397B2 失效
公开(公告)号：JPH0318397B2
公开(公告)日：1991-03-12
申请号：JP2957690
申请日：1990-02-13
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIBATA AKIRA , KOJIMA NOBORU , AZEYANAGI TOMOMITSU
IPC分类号： H04N9/793 , H04N9/79 , H04N9/83

30. 发明专利

JPH02198289A REPRODUCING CIRCUIT FOR CHROMA SIGNAL 失效
公开(公告)号：JPH02198289A
公开(公告)日：1990-08-06
申请号：JP19938289
申请日：1989-08-02
申请人： HITACHI LTD
发明人： AZEYANAGI TOMOMITSU , KOMATSU KEIICHI , KOJIMA NOBORU , SHIBATA AKIRA
IPC分类号： H04N9/65 , H04N9/83
摘要： PURPOSE:To reproduce a chroma signal by non-linearly deemphasizing a reproduced signal and deemphasizing a burst signal for specific amounts. CONSTITUTION:The output of an emphasis circuit 35 is made into a low frequency chroma signal in a frequency conversion circuit 6, mixed with a luminance signal, etc., in an LPF 7, and recorded in a tape. A low frequency converted chroma signal is selected through a reproducing head 10 by an LPF 11, amplified to a prescribed level in an ACC amplifier 12 and a detector 13, and mixed with a converted carrier signal generated in a converter 22 and selected in a BPF 21 in a converter 14, the output signal of the ACC 12 becomes the chroma signal of an ordinary frequency band, and an unnecessary spurious component is removed in a BPF 15. A crosstalk signal from an adjacent track is removed in a comb line filter circuit 16. The input/output characteristic of a deemphasis circuit 36 is made into the inversion of the characteristic of the circuit 35. For a burst signal level, the level is restored in a burst deemphasis circuit 17. Thus, the reproduced chroma signal of a terminal 18 is mixed with a reproduced luminance signal and reproduced as a video signal.

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