Color killer circuit专利检索-正向偏置控制系统专利检索查询-专利查询网

Color killer circuit

阅读：685发布：2022-01-26

专利汇可以提供Color killer circuit专利检索，专利查询，专利分析的服务。并且Improved color killer circuitry for disabling the chrominance processing channel during monochrome or very weak color signal reception. The circuit includes a high-speed semiconductor switching device interposed in the signal path of the chrominance channel and poled to conduct color information therethrough when the signal level is at a predetermined magnitude. At signal levels below threshold, the semiconductor switch is effectively reverse-biased. The disclosed circuitry further includes actuating means responsive to a source of potential wherein variations in signal level are indicative of instantaneous amplitude of the reference burst signal and which further represent received signal strength. When the chrominance information extracted from the received composite signal reaches a predetermined level, i.e., threshold, the semiconductor switching device becomes forward-biased thereby opening the signal path to pass appropriate chrominance information to subsequent stages in the chrominance channel.，下面是Color killer circuit专利的具体信息内容。

权利要求

1. Improved color killer circuitry for a color television receiver having a source of derived color-modulated subcarrier information, a source of a variable, unidirectional potential proportional to the amplitude of the reference burst signal and indicative of the received signal strength, a chroma demodulation system, and a plane of reference potential, said color killer circuitry comprising in combination: high-speed electronic switch means including a semiconductor device having a first control electrode coupled to the source of derived color-modulated subcarrier information and a second control electrode coupled to the chroma demodulation system, said semiconductor device being effective to pass signal information therethrough only when forward-biased to conduction; bias means coupled to one of said control electrodes for establishing a predetermined threshold conduction level; and switch actuating means comprising a voltage divider network connected between said source of variable, unidirectional potential and said plane of reference potential and having an intermediate junction point coupled to the other of said control electrodes of said semiconductor device whereby a control potential is applied to forward bias said high-speed switch means to pass signal information therethrough to the chroma demodulation system only when the referenced chrominance information in the received signal exceeds a predetermined, selectable level, and a voltage dependent resistance for providing proper tracking of said applied control potential to said other control electrode of said semiconductor switch means with respect to variations in received signal strength.

2. Improved color killer circuitry for a color television receiver in accordance with claim 1, wherein said semiconductor device comprises diode means poled to conduct color-modulated subcarrier information to said chroma demodulator when forward biased to said conductive state.

3. Improved color killer circuitry in accordance with claim 1, wherein said bias means comprises a further voltage divider network connected between a source of fixed unidirectional potential and said plane of reference potential and having an intermediate junction point coupled to said one control electrode of said switch means.

4. Improved color killer circuitry in accordance with claim 1, wherein the means for deriving said color-modulated subcarrier information and said source of variable, unidirectional potential include amplification means having an output coupled in series with an inductor and resistor, said source of color-modulated subcarrier information being developed across said inductive load and said source oF variable, unidirectional potential being developed at the junction of said resistive and said inductive loads.

说明书全文

相关专利内容

标题	发布/更新时间	阅读量
发光二极管(LED)测试设备和制造方法	2020-05-08	895
一种基于LSTM神经网络的自适应门限信道占用状态预测方法	2020-05-08	192
电源系统	2020-05-11	130
一种晶体管点火装置恒流驱动电路	2020-05-11	175
基于栅控LPNP晶体管进行质子位移损伤等效的方法	2020-05-11	318
电力用半导体元件的驱动电路以及电动机驱动装置	2020-05-12	203
一种采集地偏移的水温电路及其方法	2020-05-11	737
用于机动车和通信系统收发器接口的设备	2020-05-08	510
一种分裂栅4H-SiC VDMOS器件	2020-05-12	658
驱动器电路和范围检测器	2020-05-11	231

高效检索全球专利

专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。

我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。

申请试用

分析报告

专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。

申请试用

正向偏置热门专利

热门分类

Color killer circuit

该功能需要专业版企业版VIP权限，您可以：