| 摘要 |
Disclosed are novel encoder and decoder networks for respective incorporation into magnetic medium recording and reproducing apparatus. The encoder includes a pulse generating operational amplifier with positive and negative feedback, the input signal and a capacitor coupled to the inverting input of the operational amplifier. The decoder includes a pulse generating operational amplifier, the input signal respectively coupled to the non-inverting and inverting terminals of the operational amplifier through a resistor and paralleled combination of diodes connected in opposite polarity, a capacitor coupled to ground from the inverting terminal of the amplifier. The magnetic recording and reproducing apparatus is employed in electrocardiographic monitoring apparatus having dual channels for the simultaneous recording or reproduction of EKG signal information from a human being and voice communication from that human being.
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