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31. 发明专利

JPH09214853A VIDEO SIGNAL OUTPUT DEVICE 失效
公开(公告)号：JPH09214853A
公开(公告)日：1997-08-15
申请号：JP2282796
申请日：1996-02-08
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： WATANABE KATSUYUKI , NISHIJIMA HIDEO , TABATA AKIFUMI , HORI HIROYUKI , NONAKA TOMOYUKI
IPC分类号： H04N5/265 , H04N5/45
摘要： PROBLEM TO BE SOLVED: To set image quality by generating a control signal used for dividing horizontal, vertical and time base directions of a pattern so as to select different setting of an image quality setting circuit thereby comparing plural image patterns. SOLUTION: A video signal output device is a device converting a composite video signal and providing an output of the converted signal to a television receiver, a pattern division means 100 divides a pattern in a horizontal or vertical direction for a prescribed period of a horizontal synchronizing signal or a vertical synchronizing signal. Furthermore, an image quality setting means 200 sets at least two kinds of image quality of the pattern. A character superimposing means 300 superimposes character information onto the divided pattern. A selection means 400 selects the image quality of the divided patterns. A control means 500 confirms the selected pattern setting and controls the entire pattern to have the selected image quality setting again. In this case, a control signal used to divide a time base direction in a horizontal or vertical direction of the pattern is generated based on a horizontal synchronizing signal or a vertical synchronizing signal to select the image quality setting of the image quality setting circuit.

32. 发明专利

JPH08294084A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH08294084A
公开(公告)日：1996-11-05
申请号：JP9920095
申请日：1995-04-25
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： WAKUTA TETSUYA , MORO EIJI , TABATA AKIFUMI , HORI KAZUAKI , KONDO KAZUO
IPC分类号： H04N5/18 , H04N5/92
摘要： PURPOSE: To reduce the component cost by eliminating the need for changing a capacitance of a clamp capacitor of a clamp circuit between at recording and at reproduction. CONSTITUTION: The processing circuit is provided with a 1st variable gain amplifier 2 receiving a recorded video signal 1, a switch 5 selecting an output of the 1st variable gain amplifier or a video signal 3 after FM demodulation, a clamp circuit 6 receiving an output of the switch 5, and a signal amplitude detection circuit 7 receiving an output signal of the clamp circuit 6, and a gain of the 1st variable gain amplifier 2 is controlled by an output signal of the signal amplitude detection circuit 7. Then an error detection current or an error correction current of the clamp circuit 6 is selected between at recording and at reproduction to select a time constant and the time constant at reproduction is set longer than that at recording. The similar effect to reduce a capacitance of the clamp capacitor is obtained by increasing the current at recording.

33. 发明专利

JPH0787456A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH0787456A
公开(公告)日：1995-03-31
申请号：JP18680093
申请日：1993-06-30
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST , HITACHI MICOM SYST KK
发明人： WATANABE KATSUYUKI , TABATA AKIFUMI , ICHIKAWA YOSHIHISA , ARAI IZUMI
IPC分类号： G11B20/06 , H04N5/21 , H04N5/93
摘要： PURPOSE:To provide a video signal processing circuit from which a stable video signal is obtained by preventing malfunction of gate clamp and malfunction of a synchronizing separator circuit due to noise produced in the special reproduction mode of a VTR. CONSTITUTION:The operation of a gate clamp circuit 8 arranged in the output stage of a nonlinear de-emphasis circuit 7 is stops for a noise period detected by an envelope detection circuit 14. Furthermore, a clip circuit 16 is provided in the input stage of a synchronizing separator circuit 12 to clip level of a synchronizing signal tip or below. Through the constitution above, the gate clamp circuit 8 stops for the noise period and makes a signal stable for the noise period and just after noise period. Thus, a stable synchronizing signal is obtained and the disturbance in a vertical synchronizing signal or skew or the like on a monitor television screen is prevented.

34. 发明专利

JPH05344474A 失效
公开(公告)号：JPH05344474A
公开(公告)日：1993-12-24
申请号：JP14963092
申请日：1992-06-09
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： KUROKAWA MASAMITSU , TABATA AKIFUMI , HORI KAZUAKI
IPC分类号： G11B20/02 , H04N5/94
摘要： PURPOSE:To prevent deterioration in picture quality due to dropout compensation in a reproduced video image. CONSTITUTION:When a dropout detection circuit 5 does not detect any dropout, a luminance signal demodulated by an FM demodulation circuit 9 is clamped at a clamp circuit 15 based on a clamp pulse via a clamp switch 8 from a pulse generating circuit 7 and fed to a reproduction processing circuit 20 via a dropout compensation switch 18 thrown to the position (a). When the dropout detection circuit 5 detects a dropout, the clamp switch 8 is thrown not to supply the clamp pulse to the clamp circuit 15, and the dropout compensation switch 18 selects a 1H delay luminance signal processed by a 1H delay element 19 and a clamp circuit 17 and the selected signal is fed to the reproduction processing circuit 20. Furthermore, the luminance signal from the FM demodulation circuit 9 is not clamped by the clamp circuit 15 and fed to the dropout compensation switch 18.

35. 发明专利

JPH03136474A FEEDBACK TYPE PEAK CLAMP CIRCUIT 失效
公开(公告)号：JPH03136474A
公开(公告)日：1991-06-11
申请号：JP27379889
申请日：1989-10-23
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： KUROKAWA MASAMITSU , ITO SHIGEYUKI , TABATA AKIFUMI
IPC分类号： H04N5/20 , H04N5/00
摘要： PURPOSE:To reduce the number of pins providing a capacitor for clamp to be one by forming a peak clamp circuit to be a feedback type. CONSTITUTION:A video signal is supplied from an input terminal 1 to a differential amplifier 2 composed of transistors 28 and 29 and in a comparator circuit 4, the output signal of the differential amplifier 2 is compared with a reference voltage 3 for clamp. In a clamp capacitor 7, the output current of the comparator circuit 4 is converted to a voltage and held. In an inverted amplifier 8, the voltage held in the clamp capacitor 7 is inverted and the output voltage of the inverted amplifier 8 is supplied to the transistor 29 constituting the differential amplifier 2. Then, a clamp output is taken out from the output of the differential amplifier 2. Thus, the number of IC pin terminals for connecting the clamp capacitor 7 can be reduced to be one and even when using a power source which power supply voltage is low and stability is lacked, a feedback type peak clamp circuit, which is not affected by the fluctuation of the power supply voltage, can be obtained with a sufficiently wide dynamic range.

36. 发明专利

JPH0296481A RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH0296481A
公开(公告)日：1990-04-09
申请号：JP24747688
申请日：1988-10-03
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： KOMATSU KEIICHI , KUNIMORI YOSHIHIKO , MASUI HIKARI , TABATA AKIFUMI , FUJITA KOJI
IPC分类号： H04N5/765 , H04N5/225 , H04N5/782
摘要： PURPOSE:To use an image pickup lens for a projecting lens in combination to use an image pickup light as a projecting light source in combination to reduce the number of components, to make the title device smaller and less expensive by integrating an image pickup-recording/reproducing unit with a copying unit. CONSTITUTION:In a recording/reproducing device 16, a video camera consisting of a lens system 2, an image pickup element 4, a preamplifier 5 and a camera signal processing circuit 6 and a recording/reproducing part 10 are integrated into the image pickup-recording/reproducing device. A projecting unit consisting of a liquid crystal driving circuit 11, a liquid crystal panel 12, a Fresnel lens 13, a light source 14 and a reflecting mirror 15 are provided in the recording/ reproducing device. The lens system 2 of the device 16 is used for the projecting lens of the projecting unit as well, a half mirror 3 is provided between the lens system 2 and the image pickup element 4, the light path of the video camera and the projecting unit is specified, the combined use of the photographing light for the projecting light source is attained, the number of the components is reduced, and the device is made smaller and less expansive.

37. 发明专利

JPH01278116A CLAMPING CIRCUIT 失效
公开(公告)号：JPH01278116A
公开(公告)日：1989-11-08
申请号：JP10540288
申请日：1988-04-30
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MATSUO SHUICHI , TABATA AKIFUMI , ITO SHIGEYUKI , WATAYA YOSHIZUMI
IPC分类号： H04N5/18 , H03G11/00 , H03K5/00 , H03K5/007
摘要： PURPOSE:To secure a wide dynamic range an to evade such a case as the clamping potential is changed by the fluctuation of the power supply voltage or the change of the temperature characteristics by constituting a clamping circuit with use of a reference voltage generating circuit, a differential amplifier of a current output form, and a comparator. CONSTITUTION:A reference voltage generating circuit is used together with a comparator 37 which compares an output signal with the reference voltage VR outputted from the reference voltage generating circuit, a capacitor 61 which holds the output of the comparator 37, and a differential amplifier 36 consisting of a 1st transistor TR42 which receives the supply of an input signal and a 2nd TR43 which receives the supply of the comparison output voltage of the comparator 37. In such a constitution, a dynamic range is increased together with reduction of the influence of the fluctuation of the power supply voltage or the change of the temperature characteristics.

38. 发明专利

JPH01105700A SOUND RECEIVING AREA SELECTING TYPE MICROPHONE 失效
公开(公告)号：JPH01105700A
公开(公告)日：1989-04-24
申请号：JP26156487
申请日：1987-10-19
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： ITO SHIGEYUKI , KANIWA KOUJI , KITADE TAKESHI , WATAYA YOSHIZUMI , TABATA AKIFUMI
IPC分类号： H04R3/00
摘要： PURPOSE:To suppress an interference tone and to receive only a sound near an object to be desired to receive by causing >=3 microphones, at least, to face to a sound source, arranging them so that a distance between the respective microphones and the sound source can be different, respectively weighting outputs from these microphones, after that, adding the outputs and taking out them. CONSTITUTION:Since a distance L between a main sound source 2 and a microphone device 1 is enough large generally in comparison with sizes DY and DZ of the microphone device 1, a signal from the main sound source 2 can be regarded as a plain wave. A distance l between a noise source 3 and the microphone device 1 is not enough large in comparison with the sizes DY and DZ of the microphone device 1, a signal from the noise source 3 can be regarded as a spherical wave. Accordingly, for the signal from the noise source 3, phase difference is generated by difference l between a distance l to a microphone element to be arranged at a coordinate (YO, ZO) and a distance l' to the microphone element to be arranged at a coordinate (Yi, Zj). Thus, by wholly adding the signals from an nY X nZ-number of microphone elements of the microphone device 1, the signal of the noise source 3 can be suppressed.

39. 发明专利

JPS61177866A CLAMP CIRCUIT 失效
公开(公告)号：JPS61177866A
公开(公告)日：1986-08-09
申请号：JP1860885
申请日：1985-02-04
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： TABATA AKIFUMI , AZEYANAGI TOMOMITSU , SHIBATA AKIRA
IPC分类号： H04N5/16
摘要： PURPOSE:To fix the output potential of a differential amplifier at a reference voltage and to expand a dynamic range by changing a voltage supplied to other transistor in accordance with the potential of an input signal. CONSTITUTION:The input signal is supplied to one transistor 19 comprising the differential amplifier 4, while to the other transistor 20 a voltage changing in accordance with a difference between the potential of the output signal of the differential amplifier 4 and the reference voltage is supplied. Since the voltage supplied to the other transistor 20 according to the potential of the input signal is changed by charging and discharging a time constant circuit 6, a signal voltage supplied to the base of a transistor 23 is so changed to equal to the reference voltage VS supplied to the base of a transistor 24.

40. 发明专利

JP2001126205A REPRODUCING DEVICE AND MAGNETIC REPRODUCING DEVICE 失效
公开(公告)号：JP2001126205A
公开(公告)日：2001-05-11
申请号：JP30370699
申请日：1999-10-26
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： WATANABE KATSUYUKI , HORI KAZUAKI , SUZUKI HIROAKI , NONAKA TOMOYUKI , MITSUBE AKISHI , TABATA AKIFUMI , MORO EIJI
IPC分类号： H04N5/922 , G11B5/027 , G11B5/035 , H04N5/92
摘要： PROBLEM TO BE SOLVED: To provide an efficient reproducing device having a signal processing means while being constituted with low cost circuit by preventing the bit accuracy from deteriorating due to the ADC(A-D conversion) when the A-D conversion is made for plural information signals. SOLUTION: The reproducing device is provided with an A-D conversion means 5 for converting the information reproduced from a recording medium whereon the 1st information and 2nd information are frequency multiplex recorded, to a digital signal, and digital signal processing means 6, 7, 8, 9, 100, 101, etc., for processing the two informations by separating them. In this device, a frequency property correcting means 3 for smphasizing the side of lower level signal out of two informations is arranged at the prestage of the A-D conversion means 5.

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