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Video processing circuit

阅读:97发布:2022-01-01

专利汇可以提供Video processing circuit专利检索,专利查询,专利分析的服务。并且A circuit for removing sync pulses from a composite color video signal and for black level clipping the luminance component of said signal without affecting the chrominance component. The composite signal is applied to an input of an amplifier having negative feedback to the same input where the output is also taken. The feedback path includes a band stop filter in the chrominance frequency band and level sensing circuitry. All portions of the signal, except the chrominance component, which are negative with respect to a selected blanking level are attenuated by the amplifier and feedback action.,下面是Video processing circuit专利的具体信息内容。

1. Apparatus for procEssing a composite color video signal to attenuate the non-chrominance components excursions of the signal which are negative with respect to a selected blanking level comprising amplifier means having inverting and non-inverting inputs and an output, means for applying said composite color video signal to said inverting input, means for connecting said non-inverting input to a selected blanking level voltage, negative feedback means connected between said amplifier output and said inverting input for providing an open feedback path for video signal portions above said selected blanking level and a closed feedback path for video signal portions below said selected blanking level, and means for taking the processed output signal at said inverting amplifier input.
2. Apparatus according to claim 1 wherein said feedback means includes band stop filter means in the chrominance frequency band of said composite color video signal.
3. Apparatus according to claim 2 wherein said feedback means further includes a pair of opposite polarity Darlington configuration emitter followers between said band stop filter means and said inverting amplifier input.
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