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1. 发明公开

EP0441314A3 Magnetic recording and reproducing apparatus 失效
标题翻译：磁记录和再现设备
公开(公告)号：EP0441314A3
公开(公告)日：1992-10-07
申请号：EP91101508.9
申请日：1991-02-05
申请人： HITACHI, LTD.
发明人： Ohtsuka, Susumu , Yatsugi, Tomishige , Okada, Yoshitaka
IPC分类号： H04N9/79 , H04N9/83
CPC分类号： H04N9/793 , G11B5/035 , H04N9/79 , H04N9/83
摘要： In a magnetic recording and reproducing apparatus, amplitude errors of recording currents supplied to a plurality of rotary magnetic heads (9, 10) respectively are detected, and, in individual periods of sequential scanning of a magnetic recording medium by the plural rotary magnetic heads, the gain of a variable gain amplifier (16) disposed in a signal recording system sequentially supplying an input video signal to the plural rotary magnetic heads is controlled so as to automatically adjust the value of the recording current supplied to each of the rotary magnetic heads.
摘要翻译：在磁记录和再现设备中，分别检测提供给多个旋转磁头（9,10）的记录电流的振幅误差，并且在由多个旋转磁头顺序扫描磁记录介质的各个时段中，控制设置在向多个旋转磁头依次提供输入视频信号的信号记录系统中设置的可变增益放大器（16）的增益，以便自动调节提供给每个旋转磁头的记录电流的值。

2. 发明授权

EP0441314B1 Magnetic recording and reproducing apparatus 失效
标题翻译：一种磁记录和再现装置
公开(公告)号：EP0441314B1
公开(公告)日：1997-05-02
申请号：EP91101508.9
申请日：1991-02-05
申请人： HITACHI, LTD.
发明人： Ohtsuka, Susumu , Yatsugi, Tomishige , Okada, Yoshitaka
IPC分类号： H04N9/79 , H04N9/83
CPC分类号： H04N9/793 , G11B5/035 , H04N9/79 , H04N9/83

3. 发明公开

EP0441314A2 Magnetic recording and reproducing apparatus 失效
标题翻译： Magnetisches Aufzeichnungs- undWiedergabegerät。
公开(公告)号：EP0441314A2
公开(公告)日：1991-08-14
申请号：EP91101508.9
申请日：1991-02-05
申请人： HITACHI, LTD.
发明人： Ohtsuka, Susumu , Yatsugi, Tomishige , Okada, Yoshitaka
IPC分类号： H04N9/79 , H04N9/83
CPC分类号： H04N9/793 , G11B5/035 , H04N9/79 , H04N9/83
摘要： In a magnetic recording and reproducing apparatus, amplitude errors of recording currents supplied to a plurality of rotary magnetic heads (9, 10) respectively are detected, and, in individual periods of sequential scanning of a magnetic recording medium by the plural rotary magnetic heads, the gain of a variable gain amplifier (16) disposed in a signal recording system sequentially supplying an input video signal to the plural rotary magnetic heads is controlled so as to automatically adjust the value of the recording current supplied to each of the rotary magnetic heads.
摘要翻译：在磁记录和再现装置中，检测分别提供给多个旋转磁头（9,10）的记录电流的振幅误差，并且在通过多个旋转磁头顺次扫描磁记录介质的各个周期中，控制设置在向多个旋转磁头顺序提供输入视频信号的信号记录系统中的可变增益放大器（16）的增益，以便自动调整提供给每个旋转磁头的记录电流的值。

4. 发明公开

EP0306817A3 Magnetic recording and reproducing apparatus of rotating head type 失效
标题翻译：旋转头类型的磁记录和再现装置
公开(公告)号：EP0306817A3
公开(公告)日：1990-09-12
申请号：EP88114197.2
申请日：1988-08-31
申请人： HITACHI, LTD.
发明人： Yatsugi, Tomishige , Ohtsuka, Susumu
IPC分类号： G11B5/00 , G11B5/024
CPC分类号： G11B5/024 , G11B5/00
摘要： The present invention relates to a drive circuit for a rotating erase head (1) used in magnetic recording and reproducing apparatus of rotating head type. Resonance capacitance (8) is added in parallel across terminals (4, 4) of a stationary winding of a rotating transformer (3) for transferring an erase signal to said rotating erase head (1). The resonance capacitance (8) causes parallel resonance at an erase signal frequency (fe) in conjunction with an inductance component (Lr) obtained when the rotating erase head (1) is seen through the rotating transformer (3). Since a parallel resonance current (i r ) thus flows through the rotating erase head (1), a very large erase current (i e ) as compared with a drive current (i d ) supplied by a drive circuit (6) can be obtained. Since the resonance capacitance (8) can be disposed within the drive circuit (6), it can be mounted very simply and the space can be efficiently used. In addition, there is no cost up of a rotating cylinder (2) on which the rotating erase head (1) is disposed at all.

5. 发明授权

EP0144910B1 Apparatus for multiplex recording and reproduction of audio and video signals 失效
标题翻译：多媒体记录和复制音频和视频信号的设备
公开(公告)号：EP0144910B1
公开(公告)日：1991-01-30
申请号：EP84114434.8
申请日：1984-11-29
申请人： HITACHI, LTD.
发明人： Miura, Kuniaki , Okada, Yoshinori , Fukushima, Isao , Ohtsuka, Susumu
IPC分类号： H04N9/82
CPC分类号： H04N9/802 , H04N9/8355

6. 发明公开

EP0306817A2 Magnetic recording and reproducing apparatus of rotating head type 失效
标题翻译： Magnetisches Aufzeichnungs- /Wiedergabegerätmit rotierendem Kopf。
公开(公告)号：EP0306817A2
公开(公告)日：1989-03-15
申请号：EP88114197.2
申请日：1988-08-31
申请人： HITACHI, LTD.
发明人： Yatsugi, Tomishige , Ohtsuka, Susumu
IPC分类号： G11B5/00 , G11B5/024
CPC分类号： G11B5/024 , G11B5/00
摘要： The present invention relates to a drive circuit for a rotating erase head (1) used in magnetic recording and reproducing apparatus of rotating head type. Resonance capacitance (8) is added in parallel across terminals (4, 4) of a stationary winding of a rotating transformer (3) for transferring an erase signal to said rotating erase head (1). The resonance capacitance (8) causes parallel resonance at an erase signal frequency (fe) in conjunction with an inductance component (Lr) obtained when the rotating erase head (1) is seen through the rotating transformer (3). Since a parallel resonance current (i r ) thus flows through the rotating erase head (1), a very large erase current (i e ) as compared with a drive current (i d ) supplied by a drive circuit (6) can be obtained. Since the resonance capacitance (8) can be disposed within the drive circuit (6), it can be mounted very simply and the space can be efficiently used. In addition, there is no cost up of a rotating cylinder (2) on which the rotating erase head (1) is disposed at all.
摘要翻译：本发明涉及用于旋转磁头式磁记录和重放装置的旋转擦除头（1）的驱动电路。在旋转变压器（3）的固定绕组的端子（4,4）上并联加上谐振电容（8），用于将擦除信号传送到所述旋转擦除头（1）。谐振电容（8）在通过旋转变压器（3）看到旋转擦除头（1）时获得的电感分量（Lr）与擦除信号频率（fe）的并联谐振。由于并联谐振电流（ir）因此流经旋转擦除头（1），所以与驱动电路（6）提供的驱动电流（id）相比可以获得非常大的擦除电流（即）。由于谐振电容（8）可以设置在驱动电路（6）内，所以可以非常简单地安装谐振电容（8），并且可以有效地使用空间。此外，完全没有设置旋转擦除头（1）的旋转圆筒（2）的成本增加。

7. 发明公开

EP0144910A3 Apparatus for multiplex recording and reproduction of audio and video signals 失效
标题翻译：多媒体记录和复制音频和视频信号的设备
公开(公告)号：EP0144910A3
公开(公告)日：1987-07-22
申请号：EP84114434
申请日：1984-11-29
申请人： HITACHI, LTD.
发明人： Miura, Kuniaki , Okada, Yoshinori , Fukushima, Isao , Ohtsuka, Susumu
IPC分类号： H04N09/82
CPC分类号： H04N9/802 , H04N9/8355
摘要： @ A recording circuit for a video tape recorder which records superposedly a frequency-modulated audio signal with a frequency-modulated luminance signal and a carrier color signal converted to a low frequency band records a carrier wave signal which is frequency-modulated by the luminance signal at a substantially constant recording current within the frequency range corresponding to a range from the sync signal leading edge to the white peak. In an ordinary recording circuit, the extent of erasure of the recorded audio signal varies with the content of the frequency-modulated luminance signal when the luminance signal is recorded on the recording track of the frequency-modulated audio signal, because recording is made by increasing a recording current for a signal having an instantaneous frequency which is low. Therefore, the recorded signal which is frequency-modulated by the audio signal is amplitude-modulated by the luminance signal, and interference with the audio signal due to the change of S/N corresponding to the change of the amplitude occurs. In the recording circuit of the present invention, however, no interference is applied to the audio signal because the extent of erasure of the recorded audio signal by the luminance signal remains substantially constant irrespective of the content of the luminance signal.

8. 发明公开

EP0144910A2 Apparatus for multiplex recording and reproduction of audio and video signals 失效
标题翻译：设备，用于多路复用和记录音频和视频信号的重放。
公开(公告)号：EP0144910A2
公开(公告)日：1985-06-19
申请号：EP84114434.8
申请日：1984-11-29
申请人： HITACHI, LTD.
发明人： Miura, Kuniaki , Okada, Yoshinori , Fukushima, Isao , Ohtsuka, Susumu
IPC分类号： H04N9/82
CPC分类号： H04N9/802 , H04N9/8355
摘要： @ A recording circuit for a video tape recorder which records superposedly a frequency-modulated audio signal with a frequency-modulated luminance signal and a carrier color signal converted to a low frequency band records a carrier wave signal which is frequency-modulated by the luminance signal at a substantially constant recording current within the frequency range corresponding to a range from the sync signal leading edge to the white peak. In an ordinary recording circuit, the extent of erasure of the recorded audio signal varies with the content of the frequency-modulated luminance signal when the luminance signal is recorded on the recording track of the frequency-modulated audio signal, because recording is made by increasing a recording current for a signal having an instantaneous frequency which is low. Therefore, the recorded signal which is frequency-modulated by the audio signal is amplitude-modulated by the luminance signal, and interference with the audio signal due to the change of S/N corresponding to the change of the amplitude occurs. In the recording circuit of the present invention, however, no interference is applied to the audio signal because the extent of erasure of the recorded audio signal by the luminance signal remains substantially constant irrespective of the content of the luminance signal.

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