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1. 发明公开

EP0405491A3 Apparatus for recording and reproducing digital still image signal 失效
标题翻译：用于记录和复制数字静止图像信号的装置
公开(公告)号：EP0405491A3
公开(公告)日：1992-07-29
申请号：EP90112236.6
申请日：1990-06-27
申请人： HITACHI, LTD.
发明人： Watatani, Yoshizumi , Shibata, Akira , Mari, Fujio
IPC分类号： H04N5/76 , H04N5/91 , H04N9/79 , H04N1/21 , G11B20/10 , H04N5/92 , H04N5/782
CPC分类号： H04N1/212 , H04N1/2112 , H04N1/2137 , H04N5/772 , H04N5/78213 , H04N5/9202 , H04N9/802 , H04N2101/00
摘要： There is provided an apparatus which has functions of both of a video camera and an electrophotographic system and in which a video signal from the video camera is recorded as an analog motion picture signal onto a tape (17) and also concurrently selectively records and reproduces either the digital audio signal or the still image signal obtained by digitizing the video signal from the video camera into/from an area different from the area to record the analog motion picture signal on the tape.

2. 发明公开

EP0405491A2 Apparatus for recording and reproducing digital still image signal 失效
标题翻译： Gerätzur Aufzeichnung und Wiedergabe eines digitalen Standbildsignals。
公开(公告)号：EP0405491A2
公开(公告)日：1991-01-02
申请号：EP90112236.6
申请日：1990-06-27
申请人： HITACHI, LTD.
发明人： Watatani, Yoshizumi , Shibata, Akira , Mari, Fujio
IPC分类号： H04N5/76 , H04N5/91 , H04N9/79 , H04N1/21 , G11B20/10 , H04N5/92 , H04N5/782
CPC分类号： H04N1/212 , H04N1/2112 , H04N1/2137 , H04N5/772 , H04N5/78213 , H04N5/9202 , H04N9/802 , H04N2101/00
摘要： There is provided an apparatus which has functions of both of a video camera and an electrophotographic system and in which a video signal from the video camera is recorded as an analog motion picture signal onto a tape (17) and also concurrently selectively records and reproduces either the digital audio signal or the still image signal obtained by digitizing the video signal from the video camera into/from an area different from the area to record the analog motion picture signal on the tape.
摘要翻译：提供了具有摄像机和电子照相系统两者的功能的装置，其中来自摄像机的视频信号作为模拟运动画面信号记录在磁带（17）上，并且还同时选择性地记录和再现任一数字音频信号或通过将来自摄像机的视频信号数字化到不同于该区域的区域而获得的静止图像信号，以将该模拟运动图像信号记录在磁带上。

3. 发明授权

EP0077567B1 Modulator-demodulator for obtaining and demodulating frequency-modulated signal 失效
标题翻译：用于获取和调制频率调制信号的调制解调器
公开(公告)号：EP0077567B1
公开(公告)日：1992-01-08
申请号：EP82109642.7
申请日：1982-10-19
申请人： Hitachi, Ltd.
发明人： Ito, Shigeyuki , Watatani, Yoshizumi , Owashi, Hitoaki
IPC分类号： H03C3/00 , H03D3/24 , H04N5/92
CPC分类号： H03D3/241 , H03C3/00 , H04N9/802

4. 发明公开

EP0140192A3 Apparatus for detecting a drop-out in a magnetic recording/reproducing apparatus 失效
标题翻译：用于检测磁记录/再现装置中的丢弃的装置
公开(公告)号：EP0140192A3
公开(公告)日：1988-01-20
申请号：EP84111764
申请日：1984-10-02
申请人： HITACHI, LTD.
发明人： Itoh, Shigeyuki , Watatani, Yoshizumi , Mohri, Katsuo
IPC分类号： H04N09/88
CPC分类号： H04N9/802 , G11B20/025 , H04N9/835
摘要： An apparatus for detecting and compensating the drop-out in a video tape recorder in which a FM audio signal is recorded on record tracks with a FM video signal. In play back mode, a phase locked loop type frequency demodulator (34) demodulates the reproduced FM audio signal. The reproduced FM audio signal is supplied to a synchronous detector (30) and synchronously detected with an another signal supplied from a phase shifter (31) which phase-shifts an output signal of a voltage controlled oscillator of the phase locked loop type frequency demodulator. An output signal of the synchronous detector is supplied through an integrator (43) to a drop-out discriminator (32). The drop-out discriminator discriminates a drop-out generating period.

5. 发明公开

EP0198511A1 Magnetic recording/reproducing apparatus 失效
标题翻译：设备，用于磁记录/重放。
公开(公告)号：EP0198511A1
公开(公告)日：1986-10-22
申请号：EP86105425.2
申请日：1986-04-18
申请人： HITACHI, LTD.
发明人： Watanabe, Katsuyuki , Ozaki, Shinji , Watatani, Yoshizumi
IPC分类号： G11B5/53
CPC分类号： G11B5/024 , G11B5/0086 , G11B5/00878 , G11B5/531 , G11B15/14
摘要： A magnetic recording/reproducing apparatus in which at least two recording and reproducing magnetic heads (18, 19; 25, 26, 27; 28; 36; 37; 38; 39) are mounted on a rotatable cylinder (17; 24; 35) with an angular distance of 180° therebetween, wherein audio signals undergone a pulse code modulation are recorded on record tracks slanted relative to the longitudinal direction of a magnetic tape (1) wrapped around the rotatable cylinder. The record track is divided trackwise into a plurality of channels (CH). The audio signals are recorded on the channel basis. The magnetic tape is transported in a forward or backward direction while recording or reproduction is conducted. The rotatable cylinder has mounted thereon a first erasing head (20; 29; 40; 59; 72) rendered operative when the magnetic tape is transported in the forward direction and a second erasing head (21; 30; 41; 60; 73) operative when the magnetic tape is transported in the backward direction for erasing only the audio signal of a given channel on the record track.

6. 发明公开

EP0141424A3 Audio signal transmission system having noise reduction means 失效
标题翻译：具有噪声减少手段的音频信号传输系统
公开(公告)号：EP0141424A3
公开(公告)日：1985-11-21
申请号：EP84113426
申请日：1984-11-07
申请人： HITACHI, LTD.
发明人： Kaniwa, Koji , Watatani, Yoshizumi , Itoh, Shigeyuki
IPC分类号： H03G09/02 , G11B20/24
CPC分类号： H03G7/007 , G11B20/10527 , G11B20/24 , H04B1/64
摘要： An audio signal transmission system having a noise reduction circuit (6), which includes a transmission medium (101) such as a magnetic tape to be used to transmit a digital signal converted from an input audio signal and thereafter to output the audio signal reproduced from the digital signal, a digital signal transmitter having a pulse-code modulator and demodulator (MODEM) (9). The noise reduction circuit (6) includes a compressor (20) for compressing the dynamic range of the input audio signal according to the detection level obtained by detecting at least the high-frequency components thereof in order to supply the output from the compression to the digital signal transmitter and an expan- ,der (21) for expanding the dynamic range of the demod-I ulated signal from the transmitter according to the detection level of at least the high-frequency components thereof. The transmission system has a low-pass filter which limits the frequency band of the input signal to be supplied to the dynamic-range compressor (20) to at most half the sampling frequency of the MODEM (9) and thus permits the noise reduction circuit (6) to compress and expand signals supplied thereto in the same frequency band without causing any erroneous operation.

7. 发明公开

EP0411440A3 Camera system and camera recording system 失效
标题翻译：相机系统和相机记录系统
公开(公告)号：EP0411440A3
公开(公告)日：1992-01-29
申请号：EP90114159.8
申请日：1990-07-24
申请人： HITACHI, LTD. , HITACHI VIDEO ENGINEERING, INC.
发明人： Yoshioka, Atsushi , Watatani, Yoshizumi , Azuma, Nobuo , Otsubo, Tadasu , Matsuo, Shuichi
IPC分类号： H04N5/335 , H04N5/92
CPC分类号： H04N9/7925 , H04N5/23293 , H04N5/335 , H04N9/79 , H04N9/7921 , H04N9/83
摘要： Herein disclosed is a camera recording system which is capable of selectively imaging an image having an aspect ratio - a ratio between the horizontal length and vertical length of a frame - of 4 : 3 as in the NTSC system and an image having a horizontally longer aspect ratio of m : n (m/n > 4/3) than the former ratio. Further disclosed is a usable method which allows the user to take only one turn for selecting the aspect ratio. The method is represented by three kinds: one using a lens unit; another using the scanning range of an image tube; and still another using an expander circuit. What is required of the user is only one turn of switching the lenses or switches, and the remaining necessary switching operations are automated.

8. 发明公开

EP0308775A3 Magnetic recording and reproducing apparatus 失效
标题翻译：磁记录和再现设备
公开(公告)号：EP0308775A3
公开(公告)日：1991-10-02
申请号：EP88114917.3
申请日：1988-09-13
申请人： HITACHI, LTD.
发明人： Takase, Osamu , Masui, Hikaru , Itoh, Shigeyuki , Watatani, Yoshizumi
IPC分类号： H04N9/83 , H04N9/79
CPC分类号： H04N9/84 , H04N9/7917 , H04N9/898
摘要： The invention relates to a magnetic recording and reproducing apparatus for eliminating the crosstalk component from an adjacent track and obtaining a high picture quality. Chrominance signals in the base band which are produced by a low frequency conversion chroma signal are supplied to comb-shaped filters which are used in the magnetic recording and reproducing apparatus. The chrominance signals in the base band are obtained by generating (25 to 36) carriers (ø₁, ø₂) synchronized with a burst signal of the low frequency conversion chroma signal including the jitter component upon reproduction and by multiplying (5, 6) the carriers (ø₁, ø₂) and the low frequency conversion chroma signal. A burst signal portion between the resultant chrominance signals in the base band is applied as a frequency control input signal to an oscillator as the carrier generating source (25 to 36), so that desired carriers (ø₁, ø₂) are derived. Thus, the frequency fluctuation is eliminated from the converted chrominance signal in the base band and the high picture quality can be realized.
摘要翻译：本发明涉及一种用于消除来自相邻轨道的串扰分量并获得高图像质量的磁记录和再现设备。由低频转换色度信号产生的基带中的色度信号被提供给在磁记录和再现设备中使用的梳形滤波器。基带中的色度信号是通过在再现时产生包括抖动分量的低频转换色度信号的突发信号同步产生（25至36）个载波（φ1，φ2）并将载波（5,6）乘以（ø1，ø2）和低频转换色度信号。将基带中所得到的色度信号之间的色同步信号部分作为频率控制输入信号加到作为载波发生源（25至36）的振荡器上，从而得到所需的载波（φ1，φ2）。因此，从基带中的转换后的色度信号中消除了频率波动，并且可以实现高图像质量。

9. 发明公开

EP0255111A3 Apparatus for recording and reproducing digital signals 失效
标题翻译：用于记录和复制数字信号的装置
公开(公告)号：EP0255111A3
公开(公告)日：1988-11-02
申请号：EP87110924
申请日：1987-07-28
申请人： HITACHI, LTD. , HITACHI VIDEO ENGINEERING, INC.
发明人： Itoh, Shigeyuki , Watatani, Yoshizumi , Tsunoka, Akitoshi
IPC分类号： G11B20/10 , H03M07/30 , G11B05/008
CPC分类号： G11B20/00007 , G11B20/10527 , G11B27/032 , G11B27/036 , G11B2220/90
摘要： A digital signal recording and reproducing apparatus comprising a dynamic range compression/expansion apparatus. The compression/expansion apparatus (16) receives a digital signal from, for example, an analog-to-digital converter (II) and compresses the dynamic range of the digital signal and the so compressed digital signal is supplied to a recording signal processing circuit (27) in the recording operation mode, while the apparatus receives a digital signal reproduction output from a recording/reproducing head (29, 30) and expands the dynamic range of the reproduced digital signal and the so expanded digital signal is supplied to, for example, a digital-to-analog converter (12) in the reproducing operation mode. The compression/expansion apparatus includes a circuit for controlling the transient response of the apparatus, that is, for controlling the operation of the compression/expansion of the dynamic range of the digital signal during transient of the digital signal so that recording of the digital signal is performed at a high density with a high quality, without suffering breathing effect, overflow, etc.

10. 发明公开

EP0076091A3 Magnetic recording and/or reproducing apparatus 失效
标题翻译：磁记录和/或复制设备
公开(公告)号：EP0076091A3
公开(公告)日：1985-07-03
申请号：EP82304990
申请日：1982-09-22
申请人： Hitachi, Ltd.
发明人： Kojima, Noboru , Watatani, Yoshizumi , Arai, Takao , Hoshino, Takashi , Shibuya, Toshifumi
IPC分类号： H04N05/92
CPC分类号： G11B5/035 , H04N5/928
摘要： In a magnetic recording and reproducing apparatus of 2-head helical scan type, an overlapping portion is formed at one end of each video track on a magnetic tape, and a PCM audio signal is recorded on this overlapping portion. Video/ audio selective switching circuits (24, 25) are disposed on the input or output side of video and audio recording amplifiers (26, 27), and video/audio selective switching circuits (24, 25) and video/audio playback equalizer circuits (18, 20) are disposed on the output side of video and audio playback amplifiers. Each of the heads acts as both of a video head and an audio head.
摘要翻译：在2磁头螺旋扫描型的磁记录和再现装置中，在磁带上的每个视频磁迹的一端形成重叠部分，并且PCM音频信号被记录在该重叠部分上。视频/音频选择性切换电路设置在视频和音频记录放大器的输入或输出侧，并且视频/音频选择性切换电路和视频/音频重放均衡器电路设置在视频和音频播放放大器的输出侧。每个头都用作视频头和音频头。

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