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71. 发明专利

JPS5917789A Dynamic emphasis and deemphasis circuit 失效
标题翻译：动态演化和深度电路
公开(公告)号：JPS5917789A
公开(公告)日：1984-01-30
申请号：JP12563682
申请日：1982-07-21
申请人： Hitachi Ltd
发明人： SHIBATA AKIRA , KOMATSU KEIICHI , MITSUHAYASHI SHIYUNSUKE
IPC分类号： H03G7/00 , G11B20/02 , H04N5/923 , H04N9/793
CPC分类号： H04N5/923
摘要： PURPOSE:To suppress the interference of a cross modulation beat and a frequency nearby signal, by raising the impedance of an impedance circuit according as the signal amplitude impressed to a frequency selecting circuit is increased. CONSTITUTION:A frequency selecting circuit 5 and a variable impedance circuit 6 are provided. When an input signal level is low, the emphasis quantity applied to side band waves is
摘要翻译：目的：为了抑制交叉调制节拍和频率附近信号的干扰，通过根据施加到频率选择电路的信号幅度提高阻抗电路的阻抗而增加。构成：提供频率选择电路5和可变阻抗电路6。当输入信号电平较低时，施加于边带波的强度为<= 1dB。然而，当输入电平降低到-10dB或-20dB时，对侧波的强调量增加到3dB或6dB。通过在记录时间中应用动态强调，在再现时应用反向特性的去加重。由于从交叉调制产生的拍频信号和相对于频率彼此接近的信号的干扰信号被泄漏到色度信号的边带频率区域，所以通过动态加重和去加重电路有效地抑制它们。

72. 发明专利

JPS58141090A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS58141090A
公开(公告)日：1983-08-22
申请号：JP2270382
申请日：1982-02-17
申请人： HITACHI LTD
发明人： KOJIMA NOBORU , KOMATSU KEIICHI , AZEYANAGI TOMOMITSU , SHIBATA AKIRA
IPC分类号： G11B20/02 , H04N9/79 , H04N9/793 , H04N9/82 , H04N9/83 , H04N9/898
摘要： PURPOSE:To suppress color moire interference, dot interference, etc., and to improve picture quality, by providing individual terminals for a luminance and a chroma signal as video input terminals of a recording and reproducing device and then connecting them to corresponding output terminals of a camera respectively. CONSTITUTION:In a figure, 33 is a color video camera, 34 is the luminance signal input terminal of a recording and reproducing device, 35 is the chroma signal input terminal; and 36 and 37 are signal processing circuits, and others are the same as usual. The luminance signal and chroma signal led out of the color video camera 33 are separated completely from each other. In this example, both signals are led to both input terminals 34 and 35 of the recording and reproducing device individually without mixture. Consequently, mutual disturbance at an overlap part of a recording current characteristic is reduced and, specially in recording, leak components of the chroma signal FM-demodulated together with the luminance signal and leak components of the luminance signal converted in terms of low frequency band together with the chroma signal are suppressed completely to suppress chroma moire interference and luminance signal dot signal interference.

73. 发明专利

JPS5897992A CHROMA SIGNAL RECORDING AND REPRODUCING CIRCUIT 失效
公开(公告)号：JPS5897992A
公开(公告)日：1983-06-10
申请号：JP19568781
申请日：1981-12-07
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 , H04N9/898
摘要： PURPOSE:To emphasize and recording a low-level signal through a chroma emphasis circuit during recording, and to eliminate non-linearity of recording through a chroma deephasis circuit during reproduction. CONSTITUTION:Only a chroma signal in a video signal inputted from an input terminal 1 is extracted through a BPF7. Then, the chroma signal adjusted to a specific level by the AGC circuit consisting of a variable gain amplifier 8 and a detecting circuit 12 is inputted to a chroma emphasis circuit 31. The chroma signal having a low-level signal emphasized is frequency-converted to a low frequency band by a recording processing circuit 10 and outputted as a low-frequency converted color signal through an LPF11. This signal is inputted to an input terminal 33 through a regenerative amplifier and supplied to an LPF24. The chroma signal passed through the LPF24 is adjusted to a specific level through the AGC circuit consisting of a variable gain amplifier 25 and a detecting circuit 29 and then reconverted from the low-frequency converted color signal into the original chroma signal through a regeneration processing circuit 26 and a comb-shaped filter 27. Then, a chroma deemphasis circuit 34 corrects nonlinearity of recording.

74. 发明专利

JPS5877389A HIGH DENSITY MAGNETIC RECORDER AND REPRODUCER 失效
公开(公告)号：JPS5877389A
公开(公告)日：1983-05-10
申请号：JP17567581
申请日：1981-11-04
申请人： HITACHI LTD
发明人： KOJIMA NOBORU , AZEYANAGI TOMOMITSU , KOMATSU KEIICHI , NAKAGAWA HIMIO , SHIBATA AKIRA
IPC分类号： H04N9/80 , H04N9/83 , H04N9/84
摘要： PURPOSE:To make the chrominance signal processing circuit for a VTR of the NTSC and PAL systems common, by selecting a plurality of signals with different phase at every 1H and correcting the phase of a reproduced chrominance signal and shifting the phase of the recorded chroma signal with this selected signal. CONSTITUTION:A chrominance signal of a carrier frequency fsc from an input terminal 1 is inputted to a converter 13 via an ACC circuit 12, and the chroma signal converted into a low frequency is given to a recording chrominance signal output terminal 6 via an LPF 14 and a recording killer circuit 15. Further, an output of an AFC circuit 34 consisting of a VCO29, frequency division circuits 30, 32, a phase selection circuit 31 and a control voltage generating circuit 33, and an output of a VCO23 are multiplied at a converter 27, and the output is inputted to a converter 13 via a BPF28. The low frequency chrominance signal obtained as the output of the LPF14 is shifted for the phase by 45 deg. at every 1H and the direction of the phase shift is inverted with the switching of the recorded video track.

75. 发明专利

JPS5857604A REPRODUCTION AMPLIFIER FOR VIDEO TAPE RECORDER 失效
公开(公告)号：JPS5857604A
公开(公告)日：1983-04-05
申请号：JP15616881
申请日：1981-10-02
申请人： HITACHI LTD
发明人： SHIBATA AKIRA , MIURA KUNIAKI , KOJIMA NOBORU , KOMATSU KEIICHI
IPC分类号： H04N5/93 , G11B5/027 , G11B20/02
摘要： PURPOSE:To minimize the luminance flicker or the chrominance flicker even with use of plural video heads of different output levels, by switching the gain of a gain switching circuit a control pulse generating circuit. CONSTITUTION:The reproduced signals (a) and (b) of video heads 1 and 2 of different track widths are fed to a preamplifier 14 which is provided with preamplifiers 4, 5 and a switching amplifier 6 which is controlled by a head switch signal (d). For instance, if the output (a) of the head 1 is larger than the output (b) of the head 2, a switch element 20 is turned on by a gain switching circuit 21 consisting of resistors 17, 19 and a switch element 20 for a period during which the head 1 is reproducing the signal, i.e. for a period during which the signal (d) is kept at a high level. Thus the gain of the circuit 21 is reduced. In such case, the output signal of the circuit 21 has the balance for each channel by setting the resistance values of the resistors 17 and 19 at a proper level respectively.

76. 发明专利

JPS5843689A COLOR VIDEO SIGNAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS5843689A
公开(公告)日：1983-03-14
申请号：JP14097181
申请日：1981-09-09
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , AZEYANAGI TOMOMITSU , KOJIMA NOBORU , SHIBATA AKIRA
IPC分类号： H04N9/80 , H04N9/793 , H04N9/835 , H04N9/86 , H04N9/89
摘要： PURPOSE:To always record an input signal in a VTR by the PAL system, and to output a signal of both the PAL and SECAM systems to the output side by switching circuit when reproducing, by inserting a TV system switching circuit between an input terminal and a recording amplifier. CONSTITUTION:A tuner 1 or a video signal input terminal 2 is selected by a changeover switch 3, its level is adjusted by an AGC circuit 4, and it is inputted to a recording/reproducing changeover switch 21, an LPF 5 and a BPF 6. By an output of this BPF 6, a PAL or SECAM signal is discriminated, and when it has proved to be the PAL system, the output of the BPF 6 is inputted to a recording circuit 14 through a switching circuit 9. Also, in case of an SECAM signal, the output of the BPF 6 is converted to a PAL signal by a system converting circuit 7, and is applied to the circuit 14. Also, when reproducing, signals processed by luminance and color signal reproduction processing circuits 18, 19 are added by a C/Y mixer 20, and it is selected whether the PAL signal reproduced by the circuit 21 is outputted, or the output of the circuit 4 is taken and signal of both the PAL and SECAM systems is outputted to an output terminal 22.

77. 发明专利

JPS57203208A HELICAL SCANNING TYPE VIDEO TAPE RECORDER 失效
公开(公告)号：JPS57203208A
公开(公告)日：1982-12-13
申请号：JP8813381
申请日：1981-06-10
申请人： HITACHI LTD
发明人： SHIBATA AKIRA , KOUNOSU MAKOTO , TAMURA TEIZOU , HIROSE KOUICHI , MIURA KUNIAKI , KOJIMA NOBORU , KOMATSU KEIICHI
IPC分类号： H01F38/14 , G11B5/02 , G11B20/02 , H04N5/931
摘要： PURPOSE:To attain small sized transformer with high performance, by using one turn winding for a rotary transformer connected to a video head. CONSTITUTION:One turn winding is used for rotor side windings 16 and 17 of a rotary transformer 5 and stator side windings 18 and 19 have light turns respectively. Five turns are provided for the windings of video heads 1 and 1'. A reluctance of magnetic path for a magnetic flux produced from the winding 17 is increased than that to the winding 16 to balance the inductance of the 1st and 2nd channels of the transformer.

78. 发明专利

JPS57147179A PICTURE RECORDING STATUS MONITORING DEVICE 失效
公开(公告)号：JPS57147179A
公开(公告)日：1982-09-10
申请号：JP3130781
申请日：1981-03-06
申请人： HITACHI LTD
发明人： KOJIMA NOBORU , SHIBATA AKIRA , MIURA KUNIAKI , KOMATSU KEIICHI
IPC分类号： H04N5/91 , G11B27/36 , H04N17/06
摘要： PURPOSE:To produce a picture recording monitoring circuit suitable for a home video tape recorder (VTR) for which a slip ring and an expensive rotary transformer are unnecessary by stopping picture recording during a specific period in a vertical blanking period and reproducing pictures only in the period. CONSTITUTION:In a helical scanning type video tape recorder, a circuit to stop current flow to a video head 1 only in a specific short period during picture recording and a circuit 8 to reproduce recorded signals during the recording current stopping period are provided. During the period that recording FM current to a recording video head 1 is interrupted, a reproducing video head 2 traces the position on which the recording video head 1 has already recorded, so that the head 2 can reproduce in the same manner as usual reproduction and a reproduced signal is supplied to preamplifier 3, a reproducing circuit 8, a level detector 11, and a level display device 12 after passing through a rotary transformer 4.

79. 发明专利

JPS57147104A VTR HAVING SWITCHING FUNCTION OF OXIDE TAPE AND METAL TAPE 失效
公开(公告)号：JPS57147104A
公开(公告)日：1982-09-10
申请号：JP3130581
申请日：1981-03-06
申请人： HITACHI LTD
发明人： MIURA KUNIAKI , SHIBATA AKIRA , KOJIMA NOBORU , KOMATSU KEIICHI
IPC分类号： H04N5/91 , G11B5/027 , G11B20/02 , H04N9/793
摘要： PURPOSE:To achieve effective use of performance of each tape, by setting a preemphasis circuit constant and a recording current to respectively a suitable value for respective tapes through the provision of a changeover switch of a specific means. CONSTITUTION:A video signal (a) becomes a recording current (b) applied to a head 7, via a preemphasis circuit 3, a clip 4, a modulator 5, and an amplifier 6. A luminance FM signal (d) among reproducing signals (c) via a preamplifier 8 becomes a reproducing luminance signal (e) via a peaking 9, a demodulator 10, a deemphasis 11, and a noise canceller 12, and on the other hand, a color signal (f) is added with the signal (e) as a reproducing color siganal (g) at an amplifier 13 and a signal processing 14 to output a video signal (h). A switching signal to a terminal 2 goes to high with a metal tape 15 and goes to low at an oxide tape 16, and the signal is applied to circuits 3-6, 8, 9, 11, 12 and 13 so that each circuit can be set to constants corresponding to the characteristics of each tape.

80. 发明专利

JPS57109110A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS57109110A
公开(公告)日：1982-07-07
申请号：JP18391980
申请日：1980-12-26
申请人： HITACHI LTD
发明人： MIURA KUNIAKI , SHIBATA AKIRA , HAZAMA TAKESHI , YAMADA JIYUN , KOJIMA NOBORU , KOMATSU KEIICHI
IPC分类号： H04N5/93 , G11B5/027 , G11B5/035
摘要： PURPOSE:To obtain a reproduction picture with good quality without S/N deterioration by means of a small sized reproduction equalizing circuit, by preventing the production of delay distortion through the reproducing equalization by means of a surface acoustic wave filter, in a helical scanning type VTR. CONSTITUTION:A reproducing video signal by preamplifiers 8, 9 which have flat amplitude and delay characteristics through peaking adjustment with capacitors 25, 26 and feedback registors 27, 28, is applied to a surface acoustic filter 24 forming an equalizing circuit via a switching amplifier 10. By using the characteristics of the filter 24 that the amplitude and delay characteristics can be selected independently, the provision of required amplitude characteristics 31 for the filter 24 while assuring flat delay characteristics 32, allows to prevent the deterioration in S/N without using a peaking circuit and a phase equalizer and the like, by avoiding the conversion of amplitude modulation noise into phase modulation noise. Thus, a reproduction picture of good quality withous S/N can be formed with a reproduction equalizing circuit of small size.

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