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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/600858/lm567c-does-the-inband-outband-in-the-spec-refer-to-the-telephony-term-or-the-bandwidth
在规范中，有一个"最大的同步带外信号与带内信号比率"规范。 带内是指带内电话(即 300-3.4k Hz)？ 还是指触发芯片的检测频率的带宽？
