公开(公告)号：KR820002357B1

公开(公告)日：1982-12-23

申请号：KR790003506

申请日：1979-10-12

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N5/16

Abstract: Apparatus for automatically controlling the bias of an image reproducing color kinescope in a system including a plurality of video driver states for supplying image representative video signals to respective intensity control electrodes of the electron guns of the kinescope. The output of each driver stage is coupled to an operating supply voltage via a load impedance. The electron gun currents (e.g., Cathode currents) are sensed during image blanking intervals of the video signal to provide respective control voltages representative of the electron gun blanking current levels.

公开(公告)号：KR800000983B1

公开(公告)日：1980-09-17

申请号：KR760001228

申请日：1976-03-19

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/12

Abstract: In a system for processing color televion signals including chrominance signals and a reference subcarrier signal, hue correction apparatus comprises a means which has a first input responsive to the reference subcarrier signal and a second input responsive to the chrominance signals, signal modulating means responsive to the control signal for passing a selected amplitude portion of the chrominance signals, signal combining means responsive to the reference subcarrier signal for providing a corrected reference subcarrier, and biasing means coupled to the signal modulating means for restricting output of the selected amplitude portion of the chrominance signals.

公开(公告)号：KR810001901B1

公开(公告)日：1981-11-20

申请号：KR780001805

申请日：1978-06-13

Applicant: RCA CORP

Inventor： GROENWEG W ,  JUMA A ,  HARWOOD L

IPC: H04N5/14

Abstract: The brightness control appts. in a video system employs a sample and hold cct. including a charge storage capacitor. The sample and hold cct. forms a closed control loop with a signal processing channel, and is keyed during blanking intervals to sample the magnitude of a reference voltage and a brightness representative blanking level of the video signal. The sample and hold cct. provides an output control signal indicative of the voltage difference between the reference voltage and the blanking level. The control signal is applied to the signal channel for translating the blanking level in a direction to minimise the voltage difference.

公开(公告)号：KR810001902B1

公开(公告)日：1981-11-20

申请号：KR780001753

申请日：1978-06-09

Applicant: RCA CORP

Inventor： GROENEWEG W ,  HARWOOD L ,  TUMA A

IPC: H04N5/58

Abstract: An average beam current limiter for a kinescope responsive to video signals coupled via a signal transmission channel(STC) comprises a source of control signals representative of average current drawn by the kinescope. When average beam current exceeds a predetd. threshold level by an amt. within a first range beam current, a corresponding control signal is coupled to the STC to vary the DC content of the video signal in a direction to limit beam current above the threshold level within the first range. When beam current exceeds the threshold level by a relatively greater amt. within a second range of current, a corresponding control signal serves to current within the second range.

公开(公告)号：KR800001022B1

公开(公告)日：1980-09-22

申请号：KR760002871

申请日：1976-11-18

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/46

Abstract: An oscillator suitable for construction in integrated cct. form is composed of an oscillation amplifier(60) with an input(9) and output(8), a reactive filter network(63) having a predetermined resonant frequency coupled in a closed loop between the input and output of the amplifier, a phase shift network(80) coupled to the output for phase shifting the oscillatory signal, a source of control signal representative of the frequency or phase of the oscillatory signal with respect to the burst component and a combining network(69) coupled to the oscillation amplifier.

公开(公告)号：KR800001094B1

公开(公告)日：1980-10-08

申请号：KR770000182

申请日：1977-01-28

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/46

Abstract: Electronic signal processing apparatus for seperating and amplifying burst-chroma signal components of periodic color television composite chrominsnce signals comprises differential amplifier means(65) for producing amplified antiphase composite signals, first gating means(76,77) and second gating means(86,87) each of which comprises first and second current conducting devices, and means for providing periocid gating signals for a period of comprising first and second gating intervals.

公开(公告)号：KR800001025B1

公开(公告)日：1980-09-22

申请号：KR760003199

申请日：1976-12-28

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/535

Abstract: A controllable phase shifting cct. suitable for providing tint control in a color television system is composed of a source(T1) of 1st alternating signals(M), a source(T2) of 2nd alternating signals(P) in predetermined phase relation with the 1st signals, 1st and 2nd amplifier means(130,110) having a signal input coupled to the source of 1st signals, and a gain control input, cct. means(137) coupled from the 2nd source of signals to the signal input of the 1st amplying means and combining means(115,116) for summing output signals from the 1st and 2nd amplifier means.

公开(公告)号：US3732358A

公开(公告)日：1973-05-08

申请号：US3732358D

申请日：1971-04-14

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/68 ,  H04N9/48

CPC classification number: H04N9/68

Abstract: Automatic chroma control circuitry employs a peak detector circuit, operated from a chroma oscillator configuration, which oscillator exhibits a varying amplitude response determined by a narrow band filter included in an a.c. feedback path for the oscillator and arranged to selectively filter signal frequencies within the narrow bandpass as coupled thereto during the oscillatory burst interval. The bandpass filtered signals, including noise components serving to vary the peak amplitude of the oscillator cause the detector to provide at an output a control voltage proportional to the highest peak of the oscillator. This control voltage is applied to a chroma amplifier stage for varying the gain in accordance with varying oscillator amplitude.

Abstract translation: 自动色度控制电路使用从色度振荡器配置操作的峰值检测器电路，该振荡器呈现由包括在交流电场中的窄带滤波器确定的变化幅度响应。 用于振荡器的反馈路径，并且被布置成在振荡脉冲间隔期间选择性地滤波窄带内的信号频率与其耦合。 带通滤波的信号，包括用于改变振荡器的峰值振幅的噪声分量，使得检测器在输出端提供与振荡器的最高峰成比例的控制电压。 该控制电压被施加到色度放大器级，以根据变化的振荡器振幅来改变增益。

公开(公告)号：US3740456A

公开(公告)日：1973-06-19

申请号：US3740456D

申请日：1972-04-10

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H03D3/00 ,  H03K17/60 ,  H04N9/45 ,  H04N9/455 ,  H04N9/68 ,  H04N9/50

CPC classification number: H04N9/455

Abstract: A sample and hold detector arrangement suitable for construction in integrated circuit form as an automatic chroma gain control detector, or a color oscillator AFPC detector, or the like. A wide bandwidth analog multiplier circuit is supplied with an intermittent reference signal and a second signal, the phase or amplitude of which is to be sampled. Pulses produced across the broad-band load are processed by a sample and hold circuit which provides substantially symmetrical bidirectional conduction to a filter capacitor during the sampling interval and a high holding impedance during the remainder of each cycle. A differential switching circuit provides rapid transition between the sample and hold functions.

Abstract translation: 适用于集成电路形式的采样和保持检测器装置，作为自动色度增益控制检测器或彩色振荡器AFPC检测器等。 宽带模拟乘法器电路被提供有间歇参考信号和第二信号，其相位或幅度将被采样。 在宽带负载下产生的脉冲由采样和保持电路处理，该采样和保持电路在采样间隔期间向滤波电容器提供基本对称的双向导通，并且在每个周期的剩余时间期间提供高的保持阻抗。 差分开关电路提供采样和保持功能之间的快速转换。

公开(公告)号：US3740462A

公开(公告)日：1973-06-19

申请号：US3740462D

申请日：1972-04-10

Applicant: RCA CORP

Inventor： HARWOOD L

IPC: H04N9/68 ,  H04N9/71 ,  H04N9/48

CPC classification number: H04N9/71

Abstract: Cascaded first and second gain-controlled amplifiers are used in the chrominance channel of a color television receiver. The gain of the first amplifier is controlled by an ACC loop employing a noise-immune detector to detect color burst information. The gain of the second amplifier is controlled by the output of a peak detector which detects picture-interval information at the output of the second amplifier. An ACC system with improved performance during the reception of noisy signals results.

Abstract translation: 级联的第一和第二增益控制放大器用于彩色电视接收机的色度通道。 第一放大器的增益由采用无噪声检测器的ACC环路来控制，以检测色同步信息。 第二放大器的增益由在第二放大器的输出端检测图像间隔信息的峰值检测器的输出来控制。 在接收到噪声信号时，具有改进性能的ACC系统结果。