RECORDING AND ANALYSIS OF LOW-LEVEL CARDIAC SIGNALS

我们记录低水平心脏信号的方法利用了高度屏蔽的 房间里，多个平行输入从紧密间隔的胸部电极到一个 用于线性放大的模拟电路，随后输入到等效电路 对数放大器的数量。 进一步消除60赫兹噪声及其 在获得谐波之后，信号进入数字逻辑电路 其检查来自每个原始输入的瞬时极性， 把这个信息传给盖茨。 当相同的极性出现时， 所有的紧密间隔的输入，信号被认为是真实的，并且 符合条件。 当未能满足这样的巧合 条件获得时，信号作为可能的放大器噪声而被拒绝。 在 最后一步，采用可变增益放大器， 强调其中预期His-Purkinje活性信号。

Our approach in recording low level cardiac signals utilized a highly shielded room, multiple parallel inputs from closely spaced chest electrodes into an analog circuit for linear amplification followed by input into an equivalent number of logarithmic amplifiers. Further elimination of 60 hertz noise and its harmonics is achieved after which the signal enters a digital logic circuit which examines the instantaneous polarity from each of the original inputs and passes this information to gates. When identical polarities are present from all of the closely spaced inputs, the signal is regarded as true, and a coincidence condition fulfilled. When failure to meet such coincidence conditions obtains, the signal is rejected as probable amplifier noise. In the final step, a variable gain amplifier is employed so that the portion of the signal in which His-Purkinje activity is expected is accented.