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对于识别放大器来说,当PAL开关动作错误时,输出端是低阻状态,迫使双稳态触发器翻转一次,把PAL开关的错误状态给予纠正。当PAL开关正确时,放大
For the identification amplifier, when the PAL switch is in error, the output is low-impedance, forcing the flip-flop to flip once to correct the error condition of the PAL switch. Zoom in when PAL switch is correct