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41. 发明专利

JPH06350873A TELEVISION RECEIVER 失效
公开(公告)号：JPH06350873A
公开(公告)日：1994-12-22
申请号：JP13736793
申请日：1993-06-08
申请人： HITACHI LTD
发明人： MORI TAKAYUKI , NAKAGAKI NOBUFUMI , BANDO YUMI , MURATA TOSHINORI
IPC分类号： H04N5/16 , H04N5/57
摘要： PURPOSE:To automatically and adequately execute the adjustment of picture quality without neglecting a signal part existing in a small number by detecting the white peak value and the black peak value of a video signal and video information quantity, and controlling optimally the video signal of every gradation by these values. CONSTITUTION:A video information detecting part 5 is constituted of a white peak detection circuit 8 to detect the white peak of a luminance signal, a black peak detection circuit 9 to detect the black peak of the luminance signal, and an information quantity detection circuit 11 to detect the information quantity of every luminance level of the luminance signal. A signal processing circuit 14 executes arithmetic operation on the basis of these video information by using fuzzy inference, and generates a control signal to control the video signal. Accordingly, the adjustment to make a picture easy to see in which the white paint-out of a bright part existing in a small number is not caused even if the luminance level is heightened when the picture has been dark thus far, and on the contrary, even if the luminance level is lowered when the picture has been bright thus far, the black paint-out of a dark part existing in a small number is hardly caused can be executed automatically.

42. 发明专利

JPH0654339A TELEVISION RECEIVER 失效
公开(公告)号：JPH0654339A
公开(公告)日：1994-02-25
申请号：JP20371092
申请日：1992-07-30
申请人： HITACHI LTD
发明人： MORI TAKAYUKI , NAKAGAKI NOBUFUMI , BANDO YUMI , HIRAHATA SHIGERU
IPC分类号： H04N9/68 , H04N9/77
摘要： PURPOSE:To enable the color saturation correction of chrominance signals corresponding to gradation correction by a simple circuit without interference by performing control at the circuit for simultaneously correcting luminance signals and the chrominance signals. CONSTITUTION:The luminance signal inputted to an input terminal 16 is delayed for delay time in a luminance signal correction circuit 1 to which the luminance signal is simultaneously inputted at a delay circuit 6 and the delay time of a correction luminance signal and the luminance signal at a subtractor 11 are subtracted together to be outputted as a correction amount. Then, it is defined as prescribed gain at a gain control circuit 14 and is subtracted from the output of a constant voltage source 13 at the subtractor 12. It is inputted to an LPF 10, high-frequency components to be the interference are band-pass limited and only low frequencies are outputted. The output is added to a contrast control voltage and a color control voltage at an adder 9 and outputted to a chrominance demodulation circuit 5. At the circuit 5, by the output voltage of the adder 9, the amplitude of carrier chrominance signals from the input terminal 17 is changed and color difference signals R-Y, G-Y and B-Y are outputted, added to the luminance signals at a matrix circuit 3 and outputted to a CRT 4.

43. 发明专利

JPH0591367A TELEVISION RECEIVER 失效
公开(公告)号：JPH0591367A
公开(公告)日：1993-04-09
申请号：JP27352091
申请日：1991-09-26
申请人： HITACHI LTD
发明人： MORI TAKAYUKI , NAKAGAKI NOBUFUMI , MURATA TOSHINORI
IPC分类号： H04N5/208
摘要： PURPOSE:To obtain a picture with high picture quality less in a fog or roughness in matching with the visual characteristic by controlling picture quality correction quantity and noise reduction quantity in response to the content of a video image. CONSTITUTION:A luminance noise reduction circuit 2 reduces a noise component of a luminance signal. A picture quality correction circuit 3 emphasizes a high frequency component to improve the sharpness. A contour detection circuit 4 detects a contour quantity at a prescribed area. A contour area discrimination circuit 5 discriminates whether or not the area is a contour area. A control signal generating circuit 6 controls the luminance noise reduction circuit 2 and the picture quality correction circuit 3. A frequency detection circuit 10 detects the frequency characteristic of the output of the contour detection circuit 4.

44. 发明专利

JPH03263977A TELEVISION RECEIVER 失效
公开(公告)号：JPH03263977A
公开(公告)日：1991-11-25
申请号：JP17644990
申请日：1990-07-05
申请人： HITACHI LTD
发明人： NAKAGAKI NOBUFUMI , MORI TAKAYUKI , MURATA TOSHINORI
IPC分类号： H04N5/208
摘要： PURPOSE:To obtain a sufficient noise reduction effect and to obtain a signal without missing of contour by controlling a limiter level of a noise reduction circuit including a cyclic filter or a feedback coefficient K with a vertical contour component of a luminance signal or a chrominance carrier signal. CONSTITUTION:A chrominance carrier signal for one vertical scanning period is inputted from an input terminal 100. The chrominance carrier signal is inputted to an adder 11 and added to a delay signal outputted from a 1H delay element 1 delayed by one horizontal scanning period. A contour signal component with a large level is eliminated from a signal B outputted from the adder 11 at a limiter circuit 8 and a vertical contour signal component with a level lower than the limiter level and a noise component are outputted. On the other hand, the vertical contour component signal E of the luminance signal is inputted to a gain coefficient control section of a coefficient device 10, and when the vertical contour component of the luminance signal exists, the gain coefficient K of the coefficient device 10 is decreased and when the vertical contour component of the luminance signal does not exist, the gain coefficient K of the coefficient device 10 is set to a prescribed value.

45. 发明专利

JPH0260375A TELEVISION RECEIVER 失效
公开(公告)号：JPH0260375A
公开(公告)日：1990-02-28
申请号：JP21070988
申请日：1988-08-26
申请人： HITACHI LTD
发明人： NAKAGAKI NOBUFUMI , MORI TAKAYUKI , KURITA TOSHIYUKI , MURATA TOSHINORI
IPC分类号： H04N5/20
摘要： PURPOSE:To stably clip the white peak by providing a beam current detecting circuit which detects a beam current flowing to a cathode-ray tube and using detection of the beam current to perform feedback control. CONSTITUTION:R, G, and B signals inputted to terminal 101 to 103 pass white peak clipping circuits 106 to 108 and are inputted to a cathode-ray tube 122. After being detected by beam current detecting circuits 115 to 117, the beam current flowing to the cathode ray tube 122 is converted to detected voltages by detecting resistances 125 to 127. Detected voltages are inputted to comparators 118 to 120 and are compared with the reference voltage of a reference power source 124. White peak clip voltages inserted to switches 109 to 111 are changed in accordance with comparison results. Meanwhile, a control signal generating circuit 121 generates a white peak control period signal by a horizontal blanking signal and a vertical blanking signal to control operations of switches 109 to 111 and comparators 118 to 120.

46. 发明专利

JPS6290085A INTEGRATED CIRCUIT FOR PROCESSING VIDEO SIGNAL 失效
公开(公告)号：JPS6290085A
公开(公告)日：1987-04-24
申请号：JP22871585
申请日：1985-10-16
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： OKADA YOSHINORI , MITSUHAYASHI SHIYUNSUKE , YAMAMOTO MOROHISA , MORI TAKAYUKI
IPC分类号： H04N5/16
摘要： PURPOSE:To eliminate waveform distortion in a video signal synchronizing part by inputting a signal obtained by clamping the sync chip voltage of an input video signal into some reference voltage to the 1st differential amplifier, further inputting it to the 2nd differential amplifier after it is DC-shifted and adding it to the outputs of both differential amplifiers. CONSTITUTION:The 1st amplifier sets resistances 29 and 30 and constant current sources 31 and 32 in order to amplify the input video signal without distortion, and turns out to be an amplifier with a wide dynamic range. Accordingly the 1st amplifier can obtain a waveform signal the same as an input waveform 23 in terms of its output current signal, as a waveform (c) shows. Since both inputs have waveforms as shown by waveforms 28 and 33 in the waveform (b) in the amplifier 19 whose dynamic range is narrow, the output current of the amplifier 19 can be switched between a sync chip level and a pedestal level, and turns out to be a waveform as a waveform (e) shows. The output current signals of both amplifiers are mixed by the resistance 30 to become a waveform as a waveform (e) shows, thereby obtaining an excellent video signal (f) without sync reduction.

47. 发明专利

JPS6223690A SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS6223690A
公开(公告)日：1987-01-31
申请号：JP16194285
申请日：1985-07-24
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： YAMASHIYA KATSUYOSHI , MORI TAKAYUKI , YAMAMOTO MOROHISA
IPC分类号： H04N5/93 , H04N5/04
摘要： PURPOSE:To form a signal processing circuit applying expansion of synchronizing signal integrally with other circuit in an IC by allowing an input circuit to amplify a video signal by a common amplifier, amplifying a horizontal synchronizing signal by other amplifier and synthesizing both the signals. CONSTITUTION:An amplifier 21 comprising transistors (TRs) Q1, Q2 amplifies a horizontal synchronizing signal VS. An amplifier 22 comprising TRs Q3, Q4 amplifies a video signal VV. When an input signal Vin is applied, since a base voltage of the TR Q4 is brought into a higher level than the base voltage of the other TRs Q1-Q3, the voltage over the pedestal level, in other words, the video signal VV is amplified by the amplifier 22. Then the voltage below the pedestal level, in other words, the horizontal synchronizing signal VS is amplified by the amplifier 21. In bringing the gain of the amplifier 21 to a high gain, an output signal Vout expanding the horizontal synchronizing signal VS is obtained.

48. 发明专利

JPS58164004A INTEGRATED SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS58164004A
公开(公告)日：1983-09-28
申请号：JP4455282
申请日：1982-03-23
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： OKADA YOSHINORI , NAKAGAWA HIMIO , FURUHATA MAKOTO , MORI TAKAYUKI
IPC分类号： G11B20/02 , G11B20/24
摘要： PURPOSE:To eliminate bad influence exerted on an input signal of a load circuit, by connecting the load circuit whose freqnecy charactersitics are different, to each transistor output of a differential amplifier, and also providing a transistor (TR) between the collector and a load of a TR of a signal input side. CONSTITUTION:At the time of picture recording, a color video signal from an input terminal 57 is supplied to an AGC circuit 19, and is impressed to an LPF 21 from an IC external terminal 20 through a TR 58 from the collector of a TR 2. The collector of the TR 58 is grounded like AC by the base-collector floating capacity, influence of the LPF 21 is absorbed by the TR 58, and does not appear in the base side of the TR 2, therefore, influence of the LPF 21 is not exerted on a monitor output of a transistor 3. At the time of reproduction, a demodulating circuit 27 operates and the AGC circuit 19 does not operated, but a signal leaks by the base-collector floating capacity of the TR 2, but it flows into the ground terminal by the base-emitter floating capacity of the TR 58, and does not appear in the external terminal 20.

49. 发明专利

JPS58111587A AUTOMATIC GAIN CONTROLLING CIRCUIT 失效
公开(公告)号：JPS58111587A
公开(公告)日：1983-07-02
申请号：JP20939481
申请日：1981-12-25
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： OKADA YOSHINORI , NAKAGAWA HIMIO , FURUHATA MAKOTO , MORI TAKAYUKI
IPC分类号： H04N5/53 , H04N5/52 , H04N5/91
摘要： PURPOSE:To attain excellent AGC performance independently of waveform distortion of a video signal, by controlling a discharge circuit with a peak detection output of a synchronizing signal and outputting a key pulse for automatic gain control based on the output of a discharge circuit. CONSTITUTION:A synchronizing signal is obtained via a variable gain circuit 5 and a synchronizing signal separation circuit 6 and applied to a peak detection circuit 1. The circuit 1 and a minute constant current discharge circuit 2 sample a peak potential of the synchronizing signal and a discharge drop is produced at the non-sampling period. The output is compared with a reference potential at comparators 11 and 13, logical product is taken at an AND circuit 14 to obtain a pulse not including the front edge of the back porch of the video signal. The pulse is applied to a detected signal generating circuit 8 as the key pulse.

50. 发明专利

JPS58111104A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS58111104A
公开(公告)日：1983-07-02
申请号：JP20939681
申请日：1981-12-25
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： OKADA YOSHINORI , NAKAGAWA HIMIO , FURUHATA MAKOTO , MORI TAKAYUKI
IPC分类号： G11B20/02
摘要： PURPOSE:To obtain constantly recording luminance signals and monitoring video signals having constant amplitude without the generation of wave form distortion due to mismatching by externally connecting a matching resistor for LPF. CONSTITUTION:A constant gain amplifier 16' is a base connection type amplifier consisting of a transistor (TR)36, a resistor 37, a constant current source 38 and a reference voltage source 39. An inputted video signal is supplied to a pin 31 as a monitoring video signal through a resistor 6 connected to the collector of a TR2 and a constant gain amplifier 25. On the other hand, a load impedance consisting of external resistors 27, 28 and a chrominance signal removing low-pass filter 29 is connected to the collector of a TR3 and a luminance signal sent from a pin 34 is applied to a pin 35 as a recording luminance signal through the amplifier 16'.

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