• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A video signal image reproducing system including a video signal processing channel, a kinescope driver for supplying amplified video signals to an image reproducing kinescope, a source of potential to which signals processed by the kinescope driver are referenced, and an adjustable brightness control network which provides a range of brightness reference voltages including a given voltage corresponding to a threshold conduction condition of the kinescope driver. The brightness network is biased from a voltage source from which the signal reference potential is derived. The signal reference potential is coupled to the kinescope driver, and to the brightness network such that the given voltage is produced when the brightness control is at a mid-range setting. A comparator compares a brightness reference voltage from the brightness control with a periodic blanking level of the video signal to provide an output control voltage, which is applied to the video channel for translating the blanking level in a direction to minimize the difference between the compared signals.
    公开号:SU1306491A3
    申请号:SU802874152
    申请日:1980-01-28
    公开日:1987-04-23
    发明作者:Лоурен Шенли Роберт
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a television technique and can be used in color-image television receivers.
    The circuit of the invention is to improve the accuracy of brightness adjustment.
    The drawing shows a structural electrical circuit of the video signal processing device,
    The video signal processing device contains a source of 1 luminance signal, a source of 2 color difference signals, a source of 3 of a blanking signal, a controlled amplifier 4, three matrix elements 5-7, a buffer amplifier consisting of three transistors 8-10 and two resistors 11 and 12, three 13-15 terminal video amplifiers, each of which includes two transistors 16 and 17, a resistor 18 and a resistive divider consisting of resistors 19-21, kinescope 22, comparator 23, luminance control unit 24, resistor 25, source 26 reference voltage and switch 27, I
    The coherence 23 consists of five transistors 28-32, three diodes 33-35, three resistors 36-38, and a capacitor 39. The brightness control unit 24 contains three resistors 40-42 and a potentiometer 43, the reference voltage source 26 contains three resistors 44-46 and the transistor 47.
    The device operates as follows. The luminance signal from source 1 through controlled amplifier 4 and matrix element 5 is fed to a buffer amplifier consisting of three transistors 8-10 and two resistors 11 and 12.
    Color difference signals BY, RY and GY are fed from source 2 to the corresponding matrix elements 5, 6 and 7, to the other inputs of which the luminance signal is received from the output of the controlled amplifier 4. The signals B obtained at the outputs of the matrix elements 5, 6 and 7, R and G are fed to the inputs of the final video amplifiers 13, 14 and 15, each of which consists of two transistors -16 and 17, a resistor 18 and a resistive divider, including resistors 19-21. The signal from the outputs of the final video amplifiers 13, 14 and 15 is fed to the corresponding control electrode of the kinescope 22.
    0
    The second output resistive dividers are combined and connected via a switch 27 to the emitter of the transistor 27 of the source 26 of the reference voltage. In the normal operating state, the resistors 44-46 on the emitter of the transistor 47 maintain a voltage of +3.3 V.
    The comparator 23, the controlled amplifier 4, the matrix element 5 and the transistor 8 of the buffer amplifier form a closed-loop closed loop that maintains constant amplification of the luminance reference voltage 5 supplied to the base of the transistor 29 and the color signal level B from the matrix element 5 during the interval blanking. From source 3, a blanking pulse is applied to the base of transistor 32 during which a comparator 23, consisting of transistors 28-32, diodes 33-35 and resistors 36-38, performs a process of comparing the reference voltage with a signal B and generating a control signal, memorized on capacitor 39. A luminance control unit 24, consisting of series-connected resistors 40-42 and a potentiometer 43, creates a luminance reference voltage.
    0
    25
    The block 24 is arranged so that when the potentiometer 43 is in the middle position, the luminance reference voltage at the junction of resistors 41, 42 and 25 is equal to the potential at the emitter of transistor 47 and no current flows through resistor 25.
    This state gives zero potential difference across resistors 19 and 20 in the emitter circuit of transistors 16 and, therefore, no current flows through these resistors at this time.
    This result corresponds to the desired zero state of the excitation signal for accurate reproduction of the black image and is maintained for each of the signals B, R and R by
    with respect to the luminance signal, which is added to each color difference signal.
    55
    F. Formula of Invention
    A video signal processing device containing a luminance signal source connected in series and a controllable amplifier, whose code is under 313
    keys to the first inputs of the three matrix elements, the second inputs of which are connected to the corresponding top: the source of the color difference signals the kinescope and the serially connected brightness control unit and the comparator whose output is connected to the control input of the controlled amplifier, and the control input of the comparator is connected with an output of a blanking signal source, characterized in that, in order to improve the accuracy of brightness adjustment, a buffer amplifier is introduced, three. video amplifier terminals whose outputs are connected to the corresponding control electrodes of the kinescope, a switch, a voltage source, the output of which is connected to the first output of the switch directly, and to the input of the brightness control unit and to the second output of the switch through a resistor, and the buffer amplifier is connected between the release of the first

    the matrix element and the input of the first terminal video amplifier, the second output of the buffer amplifier is connected to the second input of the comparator, the control input of the buffer amplifier is the input of the blank signal, the codes of the second and third matrix elements are connected to the inputs of the second and third terminal video amplifiers, respectively each terminal video amplifier contains the first and second transistors, the base of the first transistor is an input, and the collector of the second transistor contains the code of the terminal video amplifier, ba for the second transistor is the input of the bias signal, the emitter of the second transistor is connected to the collector of the first transistor, the emitter of which is connected to the first output of the resistive divider, and the second outputs of the resistive dividers of all terminal video amplifiers are connected and connected to the third output of the switch.
    权利要求:
    Claims (1)
    [1]
    Claim
    A video signal processing device containing a serially connected brightness source and a controlled amplifier, the output of which is under 3 13064 keys to the first inputs of three matrix elements, the second inputs of which are connected to the corresponding outputs of the color-difference signal source, a kinescope and a series connected brightness control unit and a comparator, the output of which connected to the control input of a controlled amplifier. and the control input of the comparator is connected to the output of the source 10 of the blanking signal, characterized in that, in order to improve the accuracy of brightness control, a buffer amplifier, three · video end amplifiers, the outputs of which, 15 are connected to the corresponding control electrodes of the kinescope, a switch, a reference voltage source, are introduced the output of which is connected directly to the first output of the switch, and a20 to the input of the brightness control unit and to the second output of the switch through a resistor, and the buffer amplifier is connected between at output of the first "1. 4 of the matrix element and the input of the first terminal video amplifier, the second output of the buffer amplifier is connected to the second input of the comparator, the control input of the buffer amplifier is the input of the blanking signal, the outputs of the second and third matrix elements are connected to the inputs of the second and third terminal video amplifiers, each terminal video amplifier contains the first and second transistors, the base of the first transistor is the input, and the collector of the second transistor is the output of the terminal video amplifier, the base is orogo transistor is the input offset signal, the emitter of the second transistor is connected to the collector of the first transistor whose emitter is connected to a first terminal of the resistive divider, and the second terminals of all the terminal resistive dividers video amplifiers are combined and connected to the third terminal of the switch.
    类似技术:
    公开号 | 公开日 | 专利标题
    US4197557A|1980-04-08|Brightness control circuit employing a closed control loop
    US4044375A|1977-08-23|Brightness control apparatus
    US4143398A|1979-03-06|Automatic brightness control circuit employing a closed control loop stabilized against disruption by large amplitude video signals
    GB2140652A|1984-11-28|Video signal processor with automatic display beam current limiter control system
    US3996609A|1976-12-07|Amplifier suitable for use as a color kinescope driver
    GB1512669A|1978-06-01|Circuit for maintaining operating point stability of an amplifier
    US4484229A|1984-11-20|Automatic kinescope bias control system with selectively disabled signal processor
    SU1306491A3|1987-04-23|Device for processing videosignal
    EP0041554B1|1987-03-25|Automatic peak beam current leveler system
    KR910009882B1|1991-12-03|Video signal processing system
    US4135200A|1979-01-16|Brightness control circuit with predictable brightness control range
    US4203131A|1980-05-13|Predictable automatic brightness control circuit in a video signal image reproducing system
    US4376288A|1983-03-08|Signal gain control with DC compensation
    US4554578A|1985-11-19|Error compensated control system in a video signal processor
    US4404593A|1983-09-13|Brightness control circuit
    US4484226A|1984-11-20|Automatic kinescope bias control system compensated for kinescope electron gun conduction dissimilarities
    EP0074081B1|1986-12-03|Signal processing unit
    US3927346A|1975-12-16|System for stabilization of working point in picture tubes
    KR900004966B1|1990-07-12|White balance correcting device of color video camera
    US3812397A|1974-05-21|Independent electron gun bias control
    US3967312A|1976-06-29|Color television chroma demodulator circuit
    US4312014A|1982-01-19|Input video processor for color television cameras
    US3831056A|1974-08-20|Beam current stabilization and blanking apparatus
    US3949165A|1976-04-06|Noise immune clamp circuit
    KR810001367B1|1981-10-15|Automatic beam current limiter
    同族专利:
    公开号 | 公开日
    US4204221A|1980-05-20|
    DK148340C|1985-10-28|
    DE3003535C2|1985-06-05|
    AT381820B|1986-12-10|
    GB2042303B|1983-05-25|
    AU5491680A|1980-08-07|
    CA1136755A|1982-11-30|
    ES488075A1|1980-09-16|
    PL126132B1|1983-07-30|
    DE3003535A1|1980-08-14|
    DK148340B|1985-06-10|
    IT8019198D0|1980-01-14|
    JPS55104182A|1980-08-09|
    SE8000547L|1980-08-01|
    GB2042303A|1980-09-17|
    PL221682A1|1980-11-03|
    FR2448269A1|1980-08-29|
    DK39780A|1980-08-01|
    KR830002474A|1983-05-28|
    FR2448269B1|1985-05-31|
    BE881451A|1980-05-16|
    AU533692B2|1983-12-08|
    KR830002171B1|1983-10-17|
    DD157288A5|1982-10-27|
    FI800206A|1980-08-01|
    JPS607871B2|1985-02-27|
    SE446420B|1986-09-08|
    NZ192756A|1983-09-30|
    ATA37980A|1986-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3301943A|1964-09-29|1967-01-31|Motorola Inc|Color television receiver biasing arrangement|
    US3597540A|1969-04-01|1971-08-03|Motorola Inc|Automatic brightness control responsive to black level of video signal|
    US3970895A|1974-09-09|1976-07-20|Rca Corporation|Circuit for maintaining operating point stability of an amplifier|
    DE2507231B1|1975-02-20|1976-05-20|Bosch Gmbh Robert|Circuit arrangement for reintroducing the DC voltage component in a video signal|
    US4051521A|1976-09-30|1977-09-27|Rca Corporation|Video amplifier for combining luminance and chrominance signals|
    US4197557A|1977-05-05|1980-04-08|Rca Corporation|Brightness control circuit employing a closed control loop|
    US4096518A|1977-05-05|1978-06-20|Rca Corporation|Average beam current limiter|
    US4110787A|1977-07-28|1978-08-29|Rca Corporation|Combined blanking level and kinescope bias clamp for a television signal processing system|
    US4143398A|1978-03-22|1979-03-06|Rca Corporation|Automatic brightness control circuit employing a closed control loop stabilized against disruption by large amplitude video signals|US4598316A|1983-05-31|1986-07-01|Rca Corporation|Brightness control network in a video signal processor with AC coupled output stages|
    US4642690A|1984-08-27|1987-02-10|Rca Corporation|Digital video signal processor with analog level control|
    JPS61140279A|1984-12-12|1986-06-27|Toshiba Corp|Video signal processing circuit|
    JPH07121124B2|1986-05-20|1995-12-20|株式会社富士通ゼネラル|CRT spot cutoff adjustment method|
    JP2863597B2|1990-03-30|1999-03-03|株式会社東芝|Clamp circuit|
    JP3047479B2|1991-01-22|2000-05-29|ソニー株式会社|Display device test circuit and method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/008,171|US4204221A|1979-01-31|1979-01-31|Predictably biased kinescope driver arrangement in a video signal processing system|
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