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1. 发明专利

DE69125870T2 未知
公开(公告)号：DE69125870T2
公开(公告)日：1997-10-09
申请号：DE69125870
申请日：1991-02-15
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： TAKEDA HIDEKAZU , IWAKURA MASAO , MASUOKA NOBUO , ITOU TETSUO , NISHIDA IKUO , YAMASHITA YOSHIHARU , OHMORI MOTONORI , IYOTA KOJI
IPC分类号： G11B15/675 , G11B15/61 , G11B15/665
摘要： A tape running guide and tape loading mechanism for magnetic tape recording and reproducing device allows a cylinder drum carrying magnetic heads to minimize its size by employing a three-dimensional loading system is employed in which a level of tape fed to a cylinder drum is made high and that of the tape leaving the cylinder drum is made low. A tape guide system includes, in the tape supply side, at least a first, movable slanted pin and a first, movable tape height regulation guide roller for deriving the tape from an open space of a magnetic tape cassette and winding the tape on the cylinder drum, a second slanted pin and a second tape height regulation guide roller and a third, movable guide pin for winding the tape on the second slanted pin are provided and, in the tape returning side, a fourth, movable slanted pin and a fourth, movable tape height regulation guide roller for deriving the magnetic tape from the open space of the tape cassette and winding the magnetic tape on the cylinder drum, a fifth, movable slanted pin and a pinch roller which are to be derived from the open space of the tape cassette and a capstan arranged outside the open space. These movable tape guide members are movable on a common area in time-shared manner to thereby make the loading mechanism compact.

2. 发明专利

DE3650110D1 未知
公开(公告)号：DE3650110D1
公开(公告)日：1994-12-01
申请号：DE3650110
申请日：1986-03-18
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , FUKUSHIMA ISAO , MORO EIJI , KANENARI SHIGEAKI
IPC分类号： H03L7/08 , H03H11/04 , H03L7/06

3. 发明专利

DE3382735T2 未知
公开(公告)号：DE3382735T2
公开(公告)日：1994-08-11
申请号：DE3382735
申请日：1983-08-26
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIBATA AKIRA , OHASHI SHINICHI
IPC分类号： G11B5/008 , G11B5/09 , G11B15/467 , G11B20/00 , G11B20/10 , G11B27/032 , G11B27/036 , H04N5/928 , H04N9/802
摘要： A helical scan type magnetic tape recording/reproducing apparatus for recording/reproducing information, for example, a large amount of time-compressed audio PCM signals on a plurality of information tracks disposed in parallel to the direction of the tape running. Each of the time-compressed audio PCM signals are recorded with one of four frequencies of a pilot signal on a selected information track, and each of the time-compressed audio PCM signals recorded on the information tracks can be selectively reproduced from the corresponding information track. The apparatus includes a circuit for generating a plurality of track indicating pulses which respectively correspond to the information tracks and are phase-locked to the rotation of the rotating heads, and a circuit for selecting one of the track indicating pulses, which is supplied to control time compressing/expanding of an audio signal.

4. 发明专利

AT100624T 未知
公开(公告)号：AT100624T
公开(公告)日：1994-02-15
申请号：AT90103913
申请日：1990-02-28
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIBATA AKIRA , OHASHI SHINICHI
IPC分类号： G11B5/008 , G11B15/467 , G11B20/00 , G11B27/02 , G11B27/032 , H04N5/92

5. 发明专利

DE3688483T2 未知
公开(公告)号：DE3688483T2
公开(公告)日：1994-01-20
申请号：DE3688483
申请日：1986-07-28
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： YOSHIO MIURA YOSHIO MIURA , MOTOYUKI SUZUKI MOTOYUKI SUZUK , MASASHI SASAKI MASASHI SASAKI
IPC分类号： G11B7/085 , G11B7/095 , G11B7/08
摘要： An optical information reproducing apparatus wherein a light spot is projected on a rotary disc (27) on which information is recorded, thereby to reproduce the information recorded on the disc (27), is provided with detection means to detect an amount of eccentricity of the disc by counting a number of tracks on the disc (27) which the light spot at rest traverses when the disc is rotated by one revolution, and eccentricity correction signal generation means to generate a sinusoidal wave signal whose amplitude is determined by the detected amount of eccentricity and whose peirod is determined by a rotational period of the disc (27). The position of the light spot is controlled in accordance with the sinusoidal wave signal and a tracking control signal.

6. 发明专利

DE4031905C2 未知
公开(公告)号：DE4031905C2
公开(公告)日：1993-12-09
申请号：DE4031905
申请日：1990-10-08
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MANO HIROYUKI , INUZUKA TATSUHIRO , KONUMA SATOSHI , FUJISAWA KAZUHIRO , FUTAMI TOSHIO , TSUNEKAWA SATORU
IPC分类号： G09G3/20 , G09G3/36 , H04N3/12
摘要： A liquid crystal display system capable of making a display of 2i+j (i, j: positive integers) kinds of tones display includes a frame rate control device for selecting one out of frame rate control data of 2j kinds in accordance with j-bit display data included in (i+j)-bit display data, i and j being positive integers, a multi-level tone pulse generator for generating display pulses of 2i+1 kinds including at least activation for display, inactivation for display, and intermediate display corresponding to an intermediate level, and a selection drive device for selecting a display pulse of one kind out of display pulses of 2i+1 kinds in accordance with the frame rate control data supplied from the frame rate control device and i-bit display data and applying the selected display pulse to a liquid crystal panel, the i-bit being different from the j-bit.

7. 发明专利

DE3779508T2 未知
公开(公告)号：DE3779508T2
公开(公告)日：1993-01-21
申请号：DE3779508
申请日：1987-07-28
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： ITOH SHIGEYUKI , WATATANI YOSHIZUMI , TSUNOKA AKITOSHI
IPC分类号： G11B20/00 , G11B20/10 , G11B27/032 , G11B27/036 , H03M7/30
摘要： A digital signal recording and reproducing apparatus comprising a dynamic range compression/expansion apparatus. The compression/expansion apparatus (l6) receives a digital signal from, for example, an analog-to-digital converter (ll) 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 (l2) 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.

8. 发明专利

DE4031905A1 LCD arrangement providing grey tone display - involving multilevel grey stage pulse generator for displaying several grey stages without degrading image quality 未知
公开(公告)号：DE4031905A1
公开(公告)日：1991-04-18
申请号：DE4031905
申请日：1990-10-08
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MANO HIROYUKI , INUZUKA TATSUHIRO , KONUMA SATOSHI , FUJISAWA KAZUHIRO , FUTAMI TOSHIO , TSUNEKAWA SATORU
IPC分类号： G09G3/20 , G09G3/36 , H04N3/12
摘要： An LCD display system has an image change controller which generates 2 to the power of j types of image change control data corresp. to a j bit display data value in a (i+j) bit data value and selects a type of image change control data control data value. A multilevel grey stage pulse generator produces pulses of 2 to the power of i +1 types. A selector/driver selects a display pulse from these types according to the generated control data value and applies it to an LC panel which can display 2 to the power of i + j grey stages. ADVANTAGE - Maintain brightness even if display changes rapidly.

9. 发明专利

DE3382202D1 未知
公开(公告)号：DE3382202D1
公开(公告)日：1991-04-18
申请号：DE3382202
申请日：1983-08-26
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIBATA AKIRA , OHASHI SHINICHI
IPC分类号： G11B5/008 , G11B5/09 , G11B15/467 , G11B20/00 , G11B20/10 , G11B27/032 , G11B27/036 , H04N5/928 , H04N9/802
摘要： A helical scan type magnetic tape recording/reproducing apparatus for recording/reproducing information, for example, a large amount of time-compressed audio PCM signals on a plurality of information tracks disposed in parallel to the direction of the tape running. Each of the time-compressed audio PCM signals are recorded with one of four frequencies of a pilot signal on a selected information track, and each of the time-compressed audio PCM signals recorded on the information tracks can be selectively reproduced from the corresponding information track. The apparatus includes a circuit for generating a plurality of track indicating pulses which respectively correspond to the information tracks and are phase-locked to the rotation of the rotating heads, and a circuit for selecting one of the track indicating pulses, which is supplied to control time compressing/expanding of an audio signal.

10. 发明专利

DE4020594A1 Combined video camera and video recording device - with switch for supplying current to electronic view finder only when eye is aligned with eyepiece 未知
公开(公告)号：DE4020594A1
公开(公告)日：1991-01-10
申请号：DE4020594
申请日：1990-06-28
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： IHARA TAKASHI
IPC分类号： H04N5/225 , H04N5/232
摘要： The combined video camera and video recording device provides an electric signal representing the camera image converted into a video signal which is subsequently recorded. The viewed image is displayed electrically via an electronic viewfinder with a common power supply providing the current for the image sensor, the recording device and the viewfinder, the current to the latter selectively disconnected by a switch. Pref. the switch allows the current to be supplied to the electronic. viewfinder when the user's eye is brought into alignment with the eyepiece of the electronic viewfinder, e.g. in response to press against the eyepiece.

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