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这种双比较器、多速率视频同步分离器可提供与合成视频输入信号同步脉冲相一致的独立水平和垂直脉冲.这一电路采用LM319双比较器集成电路和相关的无源元件,可以通过1280×1024/1:1(非隔行)工业高档视频速率将水平(HSYNC)和垂直(VSYNC)同步脉冲从标准RS170视频(525/2:1隔行)中分离出来(参见附图).合成视频输入信号通过电容器C_1和C_2交流耦合到R_2和R_3以及二极管CR1结点.视频同步端由CR1箝位在约4.5V,并加到比较器U1A的非倒相输入(引脚4).电阻分压器R4-R5确立比较器U1A倒相输入(引脚5)的阈值电
This dual comparator, multi-rate video sync separator provides independent horizontal and vertical pulses that coincide with the sync pulse of the composite video input signal using a LM319 dual comparator integrated circuit and associated passive components that can pass 1280 (Non-interlaced) Industrial high-end video rates Separate horizontal (HSYNC) and vertical (VSYNC) sync pulses from standard RS170 video (525/2: 1 interlaced) The signal is AC coupled to R_2 and R_3 and to the diode CR1 node via capacitors C_1 and C_2 The video sync is clamped at about 4.5V by CR1 and applied to the non-inverting input (pin 4) of comparator U1A Resistor divider The R4-R5 pins establish the threshold voltage at the inverting input (pin 5) of comparator U1A