专利汇可以提供Horizontal automatic frequency control circuit专利检索,专利查询,专利分析的服务。并且A horizontal automatic frequency control circuit comprising a synchronizing signal separating circuit, a horizontal oscillation circuit, a horizontal deflection circuit, a phase sensitive detector for comparing horizontal synchronizing pulses applied from said synchronizing signal separating circuit with phase comparing pulses derived from said horizontal deflection circuit thereby generating at the output thereof a control signal representative of the difference between the phase of the horizontal synchronizing pulses and the phase of the phase comparing pulses, a low-pass filter connected between said phase sensitive detector and said horizontal oscillation circuit, switching means connected to said low-pass filter for disconnectably connecting said low-pass filter to the transmission path between said phase sensitive detector and said horizontal oscillation circuit, and means for controlling said switching means by vertical synchronizing pulses so as to disconnect said low-pass filter from said transmission path for a predetermined limited period of time following the appearance of the vertical synchronizing signal. According to the present invention, the phase of the horizontal oscillation circuit can quickly respond to phase shift of the horizontal synchronizing signal by the disconnection of the low-pass filter from the transmission path.,下面是Horizontal automatic frequency control circuit专利的具体信息内容。
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