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1. 发明专利

JP2000333202A LUMINANCE SIGNAL CHROMINANCE SIGNAL SEPARATION CIRCUIT 失效
公开(公告)号：JP2000333202A
公开(公告)日：2000-11-30
申请号：JP13541199
申请日：1999-05-17
申请人： MITSUBISHI ELECTRIC CORP
发明人： KAI TOSHIHIRO , KOJIMA MASANORI
IPC分类号： H04N11/12 , H04N9/64 , H04N9/78
摘要： PROBLEM TO BE SOLVED: To obtain a luminance signal chrominance signal separation circuit where no cross color is generated even when horizontal high frequency components of a luminance signal has a distribution. SOLUTION: This luminance signal chrominance signal separation circuit is provided with a color signal extract filter 101 that switches a pass band for a chrominance signal extracted from a composite video signal (v), a luminance signal extract filter 701 that subtracts the chrominance signal from the video signal (v) to obtain a luminance output, a nonlinear cross color detection filter 401 that extracts a cross color component around a line correlation frequency of zero and around a chrominance carrier frequency from the video signal (v), a reference signal extract device 501 that extracts a prescribed frequency component of the video signal (v) as a reference component, and a comparator 601 that compares the cross color component with the reference component. When the comparison output indicates that it includes many cross color components, the pass band of the chrominance signal extract filter 101 is switched so as not to include the cross color frequency region.

2. 发明专利

JPH11308632A COLOR DEMODULATION CIRCUIT 失效
公开(公告)号：JPH11308632A
公开(公告)日：1999-11-05
申请号：JP11350598
申请日：1998-04-23
申请人： MITSUBISHI ELECTRIC CORP
发明人： KAI TOSHIHIRO , KUMANO MAKOTO , KISHIMA JUNKO , KOJIMA MASANORI
IPC分类号： H04N9/66
摘要： PROBLEM TO BE SOLVED: To obtain a color demodulation circuit that realizes color demodulation in which jitters can be hardly visually recognized, even when a horizontal synchronizing signal and a clock signal are asynchronously with each other by obtaining the difference between the horizontal synchronizing signal from a horizontal synchronizing signal generating means and the clock signal and linearly interpolating the difference through the use of a slope of an output of a horizontal delay device. SOLUTION: A digital signal delayed corresponding to one line at a horizontal delay device 50 is given to an interpolation means 190. A difference detection means 200 receives a clock signal CL from an input terminal 6 and a horizontal synchronizing signal HS generated by a horizontal synchronizing signal generating means 180 and detects a difference between them and provides an output. The interpolation means 190 detects the slope of a signal C from the received signal from the horizontal delay device 50 and sums each product between the slope and the output of the difference detection means 200. Since the output of the interpolation means 190 given to an adder means 60 and a subtractor means 70 is corrected for its amplitude corresponding to a time deviation, a jittering component in the signal calculated by the adder means 60 and the subtractor means 70 is reduced. Thus, color demodulation, where jitter produced when the clock signal and the horizontal synchronizing signal are asynchronously with each other is reduced, is realized.

3. 发明专利

JPH08294137A PROJECTOR 失效
公开(公告)号：JPH08294137A
公开(公告)日：1996-11-05
申请号：JP9502495
申请日：1995-04-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： NOSE JUNICHI , KOJIMA MASANORI , KIMURA KENJI , ARAHAMA HIDEO , KANEKO HIDEKI , MAENO KENJI , KONYA NAOTO
IPC分类号： G02F1/13 , G03B21/00 , H04N5/74 , H04N9/31
摘要： PURPOSE: To realize a high illuminance and a high resolution compatible with each other by providing a liquid crystal display panels individually to white light modulation and color light modulation in the projector employing the liquid crystal display panel for an optical modulation means. CONSTITUTION: The projector is provided with a liquid crystal display panel 20 driven by a color signal to apply color light modulation to a light and with a liquid crystal display panel 21 driven by a luminance signal whose portion below a prescribed level is compressed by a compression circuit 70 to apply white light modulation to a light and modulated lights by both the liquid crystal display panels 20, 21 are synthesized through a beam splitter 34 and the synthesized light is formed on a screen 4 via a lens 3. It is desired to obtain a color signal and a white level signal to be given to both the liquid crystal display panels 20, 21 from a composite video signal of the NTSC system or the like.

4. 发明专利

JP2549737B2 失效
公开(公告)号：JP2549737B2
公开(公告)日：1996-10-30
申请号：JP31841489
申请日：1989-12-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOJIMA MASANORI
IPC分类号： H04N5/21 , H04N9/78

5. 发明专利

JPH0626056B2 失效
公开(公告)号：JPH0626056B2
公开(公告)日：1994-04-06
申请号：JP25741486
申请日：1986-10-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： SAGARA KIKUO , KOJIMA MASANORI
IPC分类号： G11B15/093 , G11B15/46 , G11B15/48

6. 发明专利

JPH0528527B2 失效
公开(公告)号：JPH0528527B2
公开(公告)日：1993-04-26
申请号：JP624285
申请日：1985-01-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： SERIZAWA YOSHINORI , KOJIMA MASANORI
IPC分类号： H03H11/04 , H04N5/93

7. 发明专利

JPH0488716A VARIABLE CONDUCTANCE CIRCUIT 失效
公开(公告)号：JPH0488716A
公开(公告)日：1992-03-23
申请号：JP20578390
申请日：1990-07-31
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOJIMA MASANORI
IPC分类号： H03H11/40 , H03F1/42 , H03F3/45 , H03H11/04
摘要： PURPOSE:To attain electronic control to a circuit, to improve the temperature characteristic and to enhance the frequency characteristic and the S/N by injecting a signal to a 2nd differential transistor(TR) pair not through a resistor but form the collector of a 1st differential TR pair. CONSTITUTION:TRs 32, 42 are in differential connection and connected to a current source 50 via resistors 13, 14 whose resistance is R and let a current of a current source 50 be I0. Moreover, collectors of the TRs 32, 42 are connected to the bases of TRs 6, 5 and current sources 31, 41. A variable conductance gm of the circuit is controlled electronically by a current source I1 and when a current source I2 is configurated by an integrated circuit, the gm characteristic with an excellent temperature characteristic is realized. Moreover, the resistors 13, 14 are used for the injection of a collector current of the differential TRs 32, 42 directly and a high frequency component of the signal current is not fed to ground due to the capacitance with respect to ground and then the frequency characteristic is improved. Furthermore, the S/N is improved.

8. 发明专利

JPH03273286A DISPLAY DEVICE 失效
公开(公告)号：JPH03273286A
公开(公告)日：1991-12-04
申请号：JP13570390
申请日：1990-05-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOJIMA MASANORI , TAKADA YUTAKA
IPC分类号： H04N9/14 , G09G1/28 , G09G3/02
摘要： PURPOSE:To miniaturize the display device and to obtain high resolution by constituting the display device of a color image display device for one horizontal scanning(HS) line provided with three primary colors emitting means arranged in parallel with one HS line section and an optical system means for deflecting image light for one scanning line projected from the display device in the vertical direction. CONSTITUTION:The display device is constituted of a cathod ray tube (CRT) 1 provided with three primary colors emitting means 14B, 14R, 14G and three electron gans 4B, 4R, 4G making pairs with the means 14B, 14R, 14G, a horizontally deflecting coil 2, the optical system 16 for deflecting image light for one HS line in the vertical direction synchronously with a vertically synchronizing signal included in an image signal, and a driving device 17 for driving the system 16. Preferably, image signal amplifiers 10G, 10R, 10B for supplying three primary color image signals t othree glids 82G, 82R, 82B corresponding to the emitting means 14B, 14R, 14G are added. Cathod rays projected from the gans 4B, 4R, 4G selectively emit the means 14B, 14R, 14G and the image light is deflected in the vertial diection by the optical system 16 to constitute an image. Consequently, the display device can be miniaturized and high resolution can be attained.

9. 发明专利

JPH03178274A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH03178274A
公开(公告)日：1991-08-02
申请号：JP31841489
申请日：1989-12-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOJIMA MASANORI
IPC分类号： H04N5/21 , H04N9/78
摘要： PURPOSE:To relieve color blur, dot disturbance, cross color and deterioration in vertical resolution by using a nonlinear filter as an arithmetic circuit for a video signal processing circuit. CONSTITUTION:A maximum arithmetic circuit 15 is provided, which outputs a maximum value of three signals as an arithmetic circuit receiving a 1st signal 101 comprising a video signal 100 whose low frequency is suppressed and 2nd and 3rd signals 102, 103 delayed from the 1st signal 101 by an integral number of multiple and whose low frequency is suppressed in matching with the phase of the 1st signal 101. Moreover, a minimum arithmetic circuit 16 outputting a minimum value and a nonlinear circuit 1 comprising a synthesizer 18 subtracting an output of the minimum value arithmetic circuit 16 from the sum of the video signal 100, the 2nd signal 102 delayed once and the 3rd signal 103 delayed twice are provided and the output of the synthesizer 18 is subtracted from the signal 102 receiving one delay. Thus, color blur, dot disturbance, cross color and deterioration in vertical resolution are reduced.

10. 发明专利

JPH02297766A FM VIDEO SIGNAL DEMODULATOR 失效
公开(公告)号：JPH02297766A
公开(公告)日：1990-12-10
申请号：JP11920489
申请日：1989-05-12
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOJIMA MASANORI
IPC分类号： H04N5/922 , G11B20/06 , H04N5/92
摘要： PURPOSE:To ensure a state where an FM carrier always crosses a center line and to prevent occurrence of an inverting phenomenon in an FM demodulator by separating an input FM video signal into the high and low band components and synthesizing both component together after limiting the amplitude of the high band component at a level lower than that of the low band component. CONSTITUTION:A 3rd amplitude limiter 15 limits the amplitude of an output signal c of an LPF 10, and a synthesizer 15 adds the output c1 of the limiter 15 to the output b1 of a 1st amplitude limiter 12. An input FM video signal is separated into the high and low band components, and the amplitude of the low band component is set at a level lower than that of the high band component. Then both band components undergone the amplitude control are added together and synthesized with the FM video signal. This synthesized FM video signal always includes a reproduced zero-cross point even though the original FM video signal includes no zero-cross point. As a result, a video signal that is demodulated by an FM demodulator never produces an inverting phenomenon.

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